Reducing the environmental impact of surgery on a global scale: systematic review and co-prioritization with healthcare workers in 132 countries

Background Healthcare cannot achieve net-zero carbon without addressing operating theatres. The aim of this study was to prioritize feasible interventions to reduce the environmental impact of operating theatres. Methods This study adopted a four-phase Delphi consensus co-prioritization methodology. In phase 1, a systematic review of published interventions and global consultation of perioperative healthcare professionals were used to longlist interventions. In phase 2, iterative thematic analysis consolidated comparable interventions into a shortlist. In phase 3, the shortlist was co-prioritized based on patient and clinician views on acceptability, feasibility, and safety. In phase 4, ranked lists of interventions were presented by their relevance to high-income countries and low–middle-income countries. Results In phase 1, 43 interventions were identified, which had low uptake in practice according to 3042 professionals globally. In phase 2, a shortlist of 15 intervention domains was generated. In phase 3, interventions were deemed acceptable for more than 90 per cent of patients except for reducing general anaesthesia (84 per cent) and re-sterilization of ‘single-use’ consumables (86 per cent). In phase 4, the top three shortlisted interventions for high-income countries were: introducing recycling; reducing use of anaesthetic gases; and appropriate clinical waste processing. In phase 4, the top three shortlisted interventions for low–middle-income countries were: introducing reusable surgical devices; reducing use of consumables; and reducing the use of general anaesthesia. Conclusion This is a step toward environmentally sustainable operating environments with actionable interventions applicable to both high– and low–middle–income countries

Underlying-event properties in pp and p–Pb collisions at √sNN = 5.02 TeV

We report about the properties of the underlying event measured with ALICE at the LHC in pp and p−Pb collisions at sNN−−−√=5.02 TeV. The event activity, quantified by charged-particle number and summed-pT densities, is measured as a function of the leading-particle transverse momentum (ptrigT). These quantities are studied in three azimuthal-angle regions relative to the leading particle in the event: toward, away, and transverse. Results are presented for three different pT thresholds (0.15, 0.5, and 1 GeV/c) at mid-pseudorapidity (|η|10 GeV/c, whereas for lower ptrigT values the event activity is slightly higher in p−Pb than in pp collisions. The measurements are compared with predictions from the PYTHIA 8 and EPOS LHC Monte Carlo event generators

Underlying-event properties in pp and p–Pb collisions at √sNN = 5.02 TeV

We report about the properties of the underlying event measured with ALICE at the LHC in pp and p−Pb collisions at sNN−−−√=5.02 TeV. The event activity, quantified by charged-particle number and summed-pT densities, is measured as a function of the leading-particle transverse momentum (ptrigT). These quantities are studied in three azimuthal-angle regions relative to the leading particle in the event: toward, away, and transverse. Results are presented for three different pT thresholds (0.15, 0.5, and 1 GeV/c) at mid-pseudorapidity (|η|10 GeV/c, whereas for lower ptrigT values the event activity is slightly higher in p−Pb than in pp collisions. The measurements are compared with predictions from the PYTHIA 8 and EPOS LHC Monte Carlo event generators

Dielectron production at midrapidity at low transverse momentum in peripheral and semi-peripheral Pb–Pb collisions at √sNN = 5.02 TeV

The first measurement of the e+e− pair production at low lepton pair transverse momentum (pT,ee) and low invariant mass (mee) in non-central Pb−Pb collisions at sNN−−−√=5.02 TeV at the LHC is presented. The dielectron production is studied with the ALICE detector at midrapidity (|ηe|<0.8) as a function of invariant mass (0.4≤mee<2.7 GeV/c2) in the 50−70% and 70−90% centrality classes for pT,ee<0.1 GeV/c, and as a function of pT,ee in three mee intervals in the most peripheral Pb−Pb collisions. Below a pT,ee of 0.1 GeV/c, a clear excess of e+e− pairs is found compared to the expectations from known hadronic sources and predictions of thermal radiation from the medium. The mee excess spectra are reproduced, within uncertainties, by different predictions of the photon−photon production of dielectrons, where the photons originate from the extremely strong electromagnetic fields generated by the highly Lorentz-contracted Pb nuclei. Lowest-order quantum electrodynamic (QED) calculations, as well as a model that takes into account the impact-parameter dependence of the average transverse momentum of the photons, also provide a good description of the pT,ee spectra. The measured ⟨p2T,ee⟩−−−−−√ of the excess pT,ee spectrum in peripheral Pb−Pb collisions is found to be comparable to the values observed previously at RHIC in a similar phase-space region

Measurement of the radius dependence of charged-particle jet suppression in Pb–Pb collisions at sNN=5.02\sqrt{s_{\rm NN}} = 5.02 TeV

The ALICE Collaboration reports a new differential measurement of inclusive jet suppression using pp and Pb–Pb collision data at center-of-mass energy per nucleon–nucleon collision $\sqrt{s_{\rm NN}} = 5.02$ TeV. Charged-particle jets are reconstructed using the anti-$k_{\rm T}$ algorithm with resolution parameters $R$ = 0.2, 0.3, 0.4, 0.5, and 0.6 in pp collisions and $R$ = 0.2, 0.4, 0.6 in central (0–10\%), semi-central (30–50\%), and peripheral (60–80\%) Pb–Pb collisions. The analysis uses a novel approach based on machine learning to mitigate the influence of jet background in central heavy-ion collisions, which enables measurements of inclusive jet suppression for jet $p_{\rm T} \ge 40$ GeV/$c$ in central collisions at a resolution parameter of $R$ = 0.6. This is the lowest value of jet $p_{\rm T}$ achieved for inclusive jet measurements at $R$ = 0.6 at the LHC, and is an important step for discriminating different models of jet quenching in the quark-gluon plasma. The transverse momentum spectra, nuclear modification factors, and derived cross section and nuclear modification factor ratios for different jet resolution parameters of charged-particle jets are presented and compared to model predictions. A mild dependence of the nuclear modification factor ratios on collision centrality and resolution parameter is observed. The results are compared to a variety of jet quenching models with varying levels of agreement, demonstrating the effectiveness of this observable to discriminate between models.The ALICE Collaboration reports a new differential measurement of inclusive jet suppression using pp and Pb$-$Pb collision data at center-of-mass energy per nucleon-nucleon collision $\sqrt{s_{\rm NN}} = 5.02$ TeV. Charged-particle jets are reconstructed using the anti-$k_{\rm T}$ algorithm with resolution parameters $R =$ 0.2, 0.3, 0.4, 0.5, and 0.6 in pp collisions and $R =$ 0.2, 0.4, 0.6 in central (0$-$10%), semi-central (30$-$50%), and peripheral (60$-$80%) Pb$-$Pb collisions. The analysis uses a novel approach based on machine learning to mitigate the influence of jet background in central heavy-ion collisions, which enables measurements of inclusive jet suppression for jet $p_{\rm T} \geq 40$ GeV/$c$ in central collisions at a resolution parameter of $R = 0.6$. This is the lowest value of jet $p_{\rm T}$ achieved for inclusive jet measurements at $R=0.6$ at the LHC, and is an important step for discriminating different models of jet quenching in the quark-gluon plasma. The transverse momentum spectra, nuclear modification factors, and derived cross section and nuclear modification factor ratios for different jet resolution parameters of charged-particle jets are presented and compared to model predictions. A mild dependence of the nuclear modification factor ratios on collision centrality and resolution parameter is observed. The results are compared to a variety of jet quenching models with varying levels of agreement, demonstrating the effectiveness of this observable to discriminate between models

Dielectron production at midrapidity at low transverse momentum in peripheral and semi-peripheral Pb–Pb collisions at √sNN = 5.02 TeV

The first measurement of the e+e− pair production at low lepton pair transverse momentum (pT,ee) and low invariant mass (mee) in non-central Pb−Pb collisions at sNN−−−√=5.02 TeV at the LHC is presented. The dielectron production is studied with the ALICE detector at midrapidity (|ηe|<0.8) as a function of invariant mass (0.4≤mee<2.7 GeV/c2) in the 50−70% and 70−90% centrality classes for pT,ee<0.1 GeV/c, and as a function of pT,ee in three mee intervals in the most peripheral Pb−Pb collisions. Below a pT,ee of 0.1 GeV/c, a clear excess of e+e− pairs is found compared to the expectations from known hadronic sources and predictions of thermal radiation from the medium. The mee excess spectra are reproduced, within uncertainties, by different predictions of the photon−photon production of dielectrons, where the photons originate from the extremely strong electromagnetic fields generated by the highly Lorentz-contracted Pb nuclei. Lowest-order quantum electrodynamic (QED) calculations, as well as a model that takes into account the impact-parameter dependence of the average transverse momentum of the photons, also provide a good description of the pT,ee spectra. The measured ⟨p2T,ee⟩−−−−−√ of the excess pT,ee spectrum in peripheral Pb−Pb collisions is found to be comparable to the values observed previously at RHIC in a similar phase-space region

Global perspective of familial hypercholesterolaemia: a cross-sectional study from the EAS Familial Hypercholesterolaemia Studies Collaboration (FHSC)

none724siBackground The European Atherosclerosis Society Familial Hypercholesterolaemia Studies Collaboration (FHSC) global registry provides a platform for the global surveillance of familial hypercholesterolaemia through harmonisation and pooling of multinational data. In this study, we aimed to characterise the adult population with heterozygous familial hypercholesterolaemia and described how it is detected and managed globally.Methods Using FHSC global registry data, we did a cross-sectional assessment of adults (aged 18 years or older) with a clinical or genetic diagnosis of probable or definite heterozygous familial hypercholesterolaemia at the time they were entered into the registries. Data were assessed overall and by WHO regions, sex, and index versus non-index cases.Findings Of the 61 612 individuals in the registry, 42 167 adults (21 999 [53.6%] women) from 56 countries were included in the study. Of these, 31 798 (75.4%) were diagnosed with the Dutch Lipid Clinic Network criteria, and 35 490 (84.2%) were from the WHO region of Europe. Median age of participants at entry in the registry was 46.2 years (IQR 34.3-58.0); median age at diagnosis of familial hypercholesterolaemia was 44.4 years (32.5-56.5), with 40.2% of participants younger than 40 years when diagnosed. Prevalence of cardiovascular risk factors increased progressively with age and varied by WHO region. Prevalence of coronary disease was 17.4% (2.1% for stroke and 5.2% for peripheral artery disease), increasing with concentrations of untreated LDL cholesterol, and was about two times lower in women than in men. Among patients receiving lipid-lowering medications, 16 803 (81.1%) were receiving statins and 3691 (21.2%) were on combination therapy, with greater use of more potent lipid-lowering medication in men than in women. Median LDL cholesterol was 5.43 mmol/L (IQR 4.32-6.72) among patients not taking lipid-lowering medications and 4.23 mmol/L (3.20-5.66) among those taking them. Among patients taking lipid-lowering medications, 2.7% had LDL cholesterol lower than 1.8 mmol/L; the use of combination therapy, particularly with three drugs and with proprotein convertase subtilisin-kexin type 9 inhibitors, was associated with a higher proportion and greater odds of having LDL cholesterol lower than 1.8 mmol/L. Compared with index cases, patients who were non-index cases were younger, with lower LDL cholesterol and lower prevalence of cardiovascular risk factors and cardiovascular diseases (all p&lt;0.001).Interpretation Familial hypercholesterolaemia is diagnosed late. Guideline-recommended LDL cholesterol concentrations are infrequently achieved with single-drug therapy. Cardiovascular risk factors and presence of coronary disease were lower among non-index cases, who were diagnosed earlier. Earlier detection and greater use of combination therapies are required to reduce the global burden of familial hypercholesterolaemia. Copyright (C) 2021 Elsevier Ltd. All rights reserved.mixedVallejo-Vaz, Antonio J.; Stevens, Christophe A.T.; Lyons, Alexander R.M.; Dharmayat, Kanika I.; Freiberger, Tomas; Hovingh, G. Kees; Mata, Pedro; Raal, Frederick J.; Santos, Raul D.; Soran, Handrean; Watts, Gerald F.; Abifadel, Marianne; Aguilar-Salinas, Carlos A.; Alhabib, Khalid F.; Alkhnifsawi, Mutaz; Almahmeed, Wael; Alnouri, Fahad; Alonso, Rodrigo; Al-Rasadi, Khalid; Al-Sarraf, Ahmad; Al-Sayed, Nasreen; Araujo, Francisco; Ashavaid, Tester F.; Banach, Maciej; Béliard, Sophie; Benn, Marianne; Binder, Christoph J.; Bogsrud, Martin P.; Bourbon, Mafalda; Chlebus, Krzysztof; Corral, Pablo; Davletov, Kairat; Descamps, Olivier S.; Durst, Ronen; Ezhov, Marat; Gaita, Dan; Genest, Jacques; Groselj, Urh; Harada-Shiba, Mariko; Holven, Kirsten B.; Kayikcioglu, Meral; Khovidhunkit, Weerapan; Lalic, Katarina; Latkovskis, Gustavs; Laufs, Ulrich; Liberopoulos, Evangelos; Lima-Martinez, Marcos M.; Lin, Jie; Maher, Vincent; Marais, A. David; März, Winfried; Mirrakhimov, Erkin; Miserez, André R.; Mitchenko, Olena; Nawawi, Hapizah; Nordestgaard, Børge G.; Panayiotou, Andrie G.; Paragh, György; Petrulioniene, Zaneta; Pojskic, Belma; Postadzhiyan, Arman; Raslova, Katarina; Reda, Ashraf; Reiner, Željko; Sadiq, Fouzia; Sadoh, Wilson Ehidiamen; Schunkert, Heribert; Shek, Aleksandr B.; Stoll, Mario; Stroes, Erik; Su, Ta-Chen; Subramaniam, Tavintharan; Susekov, Andrey V.; Tilney, Myra; Tomlinson, Brian; Truong, Thanh Huong; Tselepis, Alexandros D.; Tybjærg-Hansen, Anne; Vázquez Cárdenas, Alejandra; Viigimaa, Margus; Wang, Luya; Yamashita, Shizuya; Kastelein, John J.P.; Bruckert, Eric; Vohnout, Branislav; Schreier, Laura; Pang, Jing; Ebenbichler, Christoph; Dieplinger, Hans; Innerhofer, Reinhold; Winhofer-Stöckl, Yvonne; Greber-Platzer, Susanne; Krychtiuk, Konstantin; Speidl, Walter; Toplak, Hermann; Widhalm, Kurt; Stulnig, Thomas; Huber, Kurt; Höllerl, Florian; Rega-Kaun, Gersina; Kleemann, Lucas; Mäser, Martin; Scholl-Bürgi, Sabine; Säly, Christoph; Mayer, Florian J.; Sablon, Gaelle; Tarantino, Eric; Nzeyimana, Charlotte; Pojskic, Lamija; Sisic, Ibrahim; Nalbantic, Azra D.; Jannes, Cinthia E.; Pereira, Alexandre C.; Krieger, Jose E.; Petrov, Ivo; Goudev, Assen; Nikolov, Fedya; Tisheva, Snejana; Yotov, Yoto; Tzvetkov, Ivajlo; Baass, Alexis; Bergeron, Jean; Bernard, Sophie; Brisson, Diane; Brunham, Liam R.; Cermakova, Lubomira; Couture, Patrick; Francis, Gordon A.; Gaudet, Daniel; Hegele, Robert A.; Khoury, Etienne; Mancini, G.B. John; McCrindle, Brian W.; Paquette, Martine; Ruel, Isabelle; Cuevas, Ada; Asenjo, Sylvia; Wang, Xumin; Meng, Kang; Song, Xiantao; Yong, Qiang; Jiang, Tao; Liu, Ziyou; Duan, Yanyu; Hong, Jing; Ye, Pucong; Chen, Yan; Qi, Jianguang; Liu, Zesen; Li, Yuntao; Zhang, Chaoyi; Peng, Jie; Yang, Ya; Yu, Wei; Wang, Qian; Yuan, Hui; Cheng, Shitong; Jiang, Long; Chong, Mei; Jiao, Jian; Wu, Yue; Wen, Wenhui; Xu, Liyuan; Zhang, Ruiying; Qu, Yichen; He, Jianxun; Fan, Xuesong; Wang, Zhenjia; Chow, Elaine; Pećin, Ivan; Perica, Dražen; Symeonides, Phivos; Vrablik, Michal; Ceska, Richard; Soska, Vladimir; Tichy, Lukas; Adamkova, Vera; Franekova, Jana; Cifkova, Renata; Kraml, Pavel; Vonaskova, Katerina; Cepova, Jana; Dusejovska, Magdalena; Pavlickova, Lenka; Blaha, Vladimir; Rosolova, Hana; Nussbaumerova, Barbora; Cibulka, Roman; Vaverkova, Helena; Cibickova, Lubica; Krejsova, Zdenka; Rehouskova, Katerina; Malina, Pavel; Budikova, Milena; Palanova, Vaclava; Solcova, Lucie; Lubasova, Alena; Podzimkova, Helena; Bujdak, Juraj; Vesely, Jiri; Jordanova, Marta; Salek, Tomas; Urbanek, Robin; Zemek, Stanislav; Lacko, Jan; Halamkova, Hana; Machacova, Sona; Mala, Sarka; Cubova, Eva; Valoskova, Katerina; Burda, Lukas; Bendary, Ahmed; Daoud, Ihab; Emil, Sameh; Elbahry, Atef; Rafla, Samir; Sanad, Osama; Kazamel, Ghada; Ashraf, Mohamed; Sobhy, Mohamed; El-Hadidy, Amro; Shafy, Mohamed A.; Kamal, Saif; Bendary, Mohamed; Talviste, Grete; Angoulvant, Denis; Boccara, Franck; Cariou, Bertrand; Carreau, Valérie; Carrie, Alain; Charrieres, Sybil; Cottin, Yves; Di-Fillipo, Mathilde; Ducluzeau, Pierre H.; Dulong, Sonia; Durlach, Vincent; Farnier, Michel; Ferrari, Emile; Ferrieres, Dorota; Ferrieres, Jean; Gallo, Antonio; hankard, Regis; Inamo, Jocelyne; Lemale, Julie; Moulin, Philippe; Paillard, François; Peretti, Noel; Perrin, Agnès; Pradignac, Alain; Rabes, Jean P.; Rigalleau, Vincent; Sultan, Ariane; Schiele, François; Tounian, Patrick; Valero, René; Verges, Bruno; Yelnik, Cécile; Ziegler, Olivier; Haack, Ira A.; Schmidt, Nina; Dressel, Alexander; Klein, Isabel; Christmann, Jutta; Sonntag, Antonia; Stumpp, Christine; Boger, Diana; Biedermann, Dana; Usme, Monica M.N.; Beil, F. Ulrich; Klose, Gerald; König, Christel; Gouni-Berthold, Ioanna; Otte, Britta; Böll, Gereon; Kirschbaum, Anja; Merke, Jürgen; Scholl, Johannes; Segiet, Thomas; Gebauer, Marco; Predica, Florentina; Mayer, Manfred; Leistikow, Frank; Füllgraf-Horst, Sabine; Müller, Cornelius; Schüler, Melanie; Wiener, Judith; Hein, Konrad; Baumgartner, Peter; Kopf, Stefan; Busch, Reinhold; Schömig, Michael; Matthias, Stephan; Allendorf-Ostwald, Nicole; Fink, Bruno; Böhm, Dieter; Jäkel, Alexander; Koschker, Ann-Cathrin; Schweizer, Rüdiger; Vogt, Anja; Parhofer, Klaus; König, Wolfgang; Reinhard, Wibke; Bäßler, Andrea; Stadelmann, Alexander; Schrader, Volker; Katzmann, Julius; Tarr, Adrienne; Steinhagen-Thiessen, Elisabeth; Kassner, Ursula; Paulsen, Gerret; Homberger, Jürgen; Zemmrich, Claudia; Seeger, Wolfgang; Biolik, Kathrin; Deiss, Dorothee; Richter, Corinna; Pantchechnikova, Elina; Dorn, Elena; Schatz, Ulrike; Julius, Ulrich; Spens, Antje; Wiesner, Tobias; Scholl, Michael; Rizos, Christos V.; Sakkas, Nikolaos; Elisaf, Moses; Skoumas, Ioannis; Tziomalos, Konstantinos; Rallidis, Loukianos; Kotsis, Vasileios; Doumas, Michalis; Athyros, Vasileios; Skalidis, Emmanouil; Kolovou, Genovefa; Garoufi, Anastasia; Bilianou, Eleni; Koutagiar, Iosif; Agapakis, Dimitrios; Kiouri, Estela; Antza, Christina; Katsiki, Niki; Zacharis, Evangelos; Attilakos, Achilleas; Sfikas, George; Koumaras, Charalambos; Anagnostis, Panagiotis; Anastasiou, Georgia; Liamis, George; Koutsogianni, Amalia-Despoina; Karányi, Zsolt; Harangi, Mariann; Bajnok, László; Audikovszky, Mária; Márk, László; Benczúr, Béla; Reiber, István; Nagy, Gergely; Nagy, András; Reddy, Lakshmi L.; Shah, Swarup A.V.; Ponde, Chandrashekhar K.; Dalal, Jamshed J.; Sawhney, Jitendra P.S.; Verma, Ishwar C.; Altaey, Mays; Al-Jumaily, Khalid; Rasul, Dilshad; Abdalsahib, Ali F.; Jabbar, Amer A.; Al-ageedi, Mohanad; Agar, Ruth; Cohen, Hofit; Ellis, Avishay; Gavishv, Dov; Harats, Dror; Henkin, Yaacov; Knobler, Hila; Leavit, Leah; Leitersdorf, Eran; Rubinstein, Ardon; Schurr, Daniel; Shpitzen, Shoshi; Szalat, Auryan; Casula, Manuela; Zampoleri, Veronica; Gazzotti, Marta; Olmastroni, Elena; Sarzani, Riccardo; Ferri, Claudio; Repetti, Elena; Sabbà, Carlo; Bossi, Antonio Carlo; Borghi, Claudio; Muntoni, Sandro; Cipollone, Francesco; Purrello, Francesco; Pujia, Arturo; Passaro, Angelina; Marcucci, Rossella; Pecchioli, Valerio; Pisciotta, Livia; Mandraffino, Giuseppe; Pellegatta, Fabio; Mombelli, Giuliana; Branchi, Adriana; Fiorenza, Anna Maria; Pederiva, Cristina; Werba, Josè Pablo; Parati, Gianfranco; Carubbi, Francesca; Iughetti, Lorenzo; Iannuzzi, Arcangelo; Iannuzzo, Gabriella; Calabrò, Paolo; Averna, Maurizio; Biasucci, Giacomo; Zambon, Sabina; Roscini, Anna Rita; Trenti, Chiara; Arca, Marcello; Federici, Massimo; Del Ben, Maria; Bartuli, Andrea; Giaccari, Andrea; Pipolo, Antonio; Citroni, Nadia; Guardamagna, Ornella; Bonomo, Katia; Benso, Andrea; Biolo, Gianni; Maroni, Lorenzo; Lupi, Alessandro; Bonanni, Luca; Zenti, Maria Grazia; Matsuki, Kota; Hori, Mika; Ogura, Masatsune; Masuda, Daisaku; Kobayashi, Takuya; Nagahama, Kumiko; Al-Jarallah, Mohammed; Radovic, Mirjana; Lunegova, Olga; Bektasheva, Erkayim; Khodzhiboboev, Elyor; Erglis, Andrejs; Gilis, Dainus; Nesterovics, Georgijs; Saripo, Vita; Meiere, Ruta; Upena-RozeMicena, Arta; Terauda, Elizabete; Jambart, Selim; Khoury, Petra E.; Elbitar, Sandy; Ayoub, Carine; Ghaleb, Youmna; Aliosaitiene, Urte; Kutkiene, Sandra; Kasim, Noor A.M.; Nor, Noor S.M.; Ramli, Anis S.; Razak, Suraya A.; Al-Khateeb, Alyaa; Kadir, Siti H.S.A.; Muid, Suhaila A.; Rahman, Thuhairah A.; Kasim, Sazzli S.; Radzi, Ahmad B.M.; Ibrahim, Khairul S.; Razali, Salmi; Ismail, Zaliha; Ghani, Rohana A.; Hafidz, Muhammad I.A.; Chua, Ang L.; Rosli, Marshima M.; Annamalai, Muthukkaruppan; Teh, Lay K.; Razali, Rafezah; Chua, Yung A.; Rosman, Azhari; Sanusi, Abdul R.; Murad, Nor A.A.; Jamal, A. Rahman A.; Nazli, Sukma A.; Razman, Aimi Z.; Rosman, Norhidayah; Rahmat, Radzi; Hamzan, Nur S.; Azzopardi, C.; Mehta, Roopa; Martagon, Alexandro J.; Ramirez, Gabriela A.G.; Villa, Neftali E.A.; Vazquez, Arsenio V.; Elias-Lopez, Daniel; Retana, Gustavo G.; Rodriguez, Betsabel; Macías, Jose J.C.; Zazueta, Alejandro R.; Alvarado, Rocio M.; Portano, Julieta D.M.; Lopez, Humberto A.; Sauque-Reyna, Leobardo; Herrera, Laura G.G.; Mendia, Luis E.S.; Aguilar, Humberto Garcia; Cooremans, Elizabeth R.; Aparicio, Berenice P.; Zubieta, Victoria M.; Gonzalez, Perla A.C.; Ferreira-Hermosillo, Aldo; Portilla, Nacu C.; Dominguez, Guadalupe J.; Garcia, Alinna Y.R.; Cazares, Hector E.A.; Gonzalez, Jesus R.; Valencia, Carla V.M.; Padilla, Francisco G.; Prado, Ramon M.; De los Rios Ibarra, Manuel O.; Villicaña, Ruy D.A.; Rivera, Karina J.A.; Carrera, Ricardo A.; Alvarez, Jose A.; Martinez, Jose C.A.; de los Reyes Barrera Bustillo, Manuel; Vargas, Gonzalo C.; Chacon, Roberto C.; Andrade, Mario H.F.; Ortega, Ashanty F.; Alcala, Hector G.; de Leon, Laura E.G.; Guzman, Berenice G.; Garcia, Jose J.G.; Cuellar, Juan C.G.; Cruz, Jose R.G.; Garcia, Anell Hernandez; Almada, Jesus R.H.; Herrera, Ursulo J.; Sobrevilla, Fabiola L.; Rodriguez, Eduardo M.; Sibaja, Cristina M.; Rodriguez, Alma B.M.; Oyervides, Jose C.M.; Vazquez, Daniel I.P.; Rodriguez, Eduardo A.R.; Osorio, Ma L.R.; Saucedo, Juan R.; Tamayo, Margarita T.; Talavera, Luis A.V.; Arroyo, Luis E.V.; Carrillo, Eloy A.Z.; Isara, Alphonsus; Obaseki, Darlington E.; Al-Waili, Khalid; Al-Zadjali, Fahad; Al-Zakwani, Ibrahim; Al-Kindi, Mohammed; Al-Mukhaini, Suad; Al-Barwani, Hamida; Rana, Asim; Shah, Lahore S.U.; Starostecka, Ewa; Konopka, Agnieszka; Lewek, Joanna; Bartłomiejczyk, Marcin; Gąsior, Mariusz; Dyrbuś, Krzysztof; Jóźwiak, Jacek; Gruchała, Marcin; Pajkowski, Marcin; Romanowska-Kocejko, Marzena; Żarczyńska-Buchowiecka, Marta; Chmara, Magdalena; Wasąg, Bartosz; Parczewska, Aleksandra; Gilis-Malinowska, Natasza; Borowiec-Wolna, Justyna; Stróżyk, Aneta; Woś, Marlena; Michalska-Grzonkowska, Aleksandra; Medeiros, Ana M.; Alves, Ana C.; Silva, Francisco; Lobarinhas, Goreti; Palma, Isabel; de Moura, Jose P.; Rico, Miguel T.; Rato, Quitéria; Pais, Patrícia; Correia, Susana; Moldovan, Oana; Virtuoso, Maria J.; Salgado, Jose M.; Colaço, Ines; Dumitrescu, Andreea; Lengher, Calin; Mosteoru, Svetlana; Meshkov, Alexey; Ershova, Alexandra; Rozkova, Tatiana; Korneva, Victoria; Yu, Kuznetsova T.; Zafiraki, Vitaliy; Voevoda, Mikhail; Gurevich, Victor; Duplyakov, Dmitry; Ragino, Yulia; Safarova, Maya; Shaposhnik, Igor; Alkaf, Fahmi; Khudari, Alia; Rwaili, Nawal; Al-Allaf, Faisal; Alghamdi, Mohammad; Batais, Mohammed A.; Almigbal, Turky H.; Kinsara, Abdulhalim; AlQudaimi, Ashraf H.A.; Awan, Zuhier; Elamin, Omer A.; Altaradi, Hani; Rajkovic, Natasa; Popovic, Ljiljana; Singh, Sandra; Stosic, Ljubica; Rasulic, Iva; Lalic, Nebojsa M.; Lam, Carolyn; Le, Tan J.; Siang, Eric L.T.; Dissanayake, Sanjaya; I-Shing, Justin T.; Shyong, Tai E.; Jin, Terrance C.S.; Balinth, Karin; Buganova, Ingrid; Fabryova, Lubomira; Kadurova, Michaela; Klabnik, Alexander; Kozárová, Miriam; Sirotiakova, Jana; Battelino, Tadej; Kovac, Jernej; Mlinaric, Matej; Sustar, Ursa; Podkrajsek, Katarina T.; Fras, Zlatko; Jug, Borut; Cevc, Matija; Pilcher, Gillian J.; Blom, D.J.; Wolmarans, K.H.; Brice, B.C.; Muñiz-Grijalvo, Ovidio; Díaz-Díaz, Jose L.; de Isla, Leopoldo P.; Fuentes, Francisco; Badimon, Lina; Martin, François; Lux, Angela; Chang, Nien-Tzu; Ganokroj, Poranee; Akbulut, Mehmet; Alici, Gökhan; Bayram, Fahri; Can, Levent H.; Celik, Ahmet; Ceyhan, Ceyhun; Coskun, Fatma Y.; Demir, Mesut; Demircan, Sabri; Dogan, Volkan; Durakoglugil, Emre; Dural, Ibrahim E.; Gedikli, Omer; Hacioglu, Aysa; Ildizli, Muge; Kilic, Salih; Kirilmaz, Bahadir; Kutlu, Merih; Oguz, Aytekin; Ozdogan, Oner; Onrat, Ersel; Ozer, Savas; Sabuncu, Tevfik; Sahin, Tayfun; Sivri, Fatih; Sonmez, Alper; Temizhan, Ahmet; Topcu, Selim; Tuncez, Abdullah; Vural, Mirac; Yenercag, Mustafa; Yesilbursa, Dilek; Yigit, Zerrin; Yildirim, Aytul B.; Yildirir, Aylin; Yilmaz, Mehmet B.; Atallah, Bassam; Traina, Mahmoud; Sabbour, Hani; Hay, Dana A.; Luqman, Neama; Elfatih, Abubaker; Abdulrasheed, Arshad; Kwok, See; Oca, Nicolas D.; Reyes, Ximena; Alieva, Rano B.; Kurbanov, Ravshanbek D.; Hoshimov, Shavkat U.; Nizamov, Ulugbek I.; Ziyaeva, Adolat V.; Abdullaeva, Guzal J.; Do, Doan L.; Nguyen, Mai N.T.; Kim, Ngoc T.; Le, Thanh T.; Le, Hong A.; Tokgozoglu, Lale; Catapano, Alberico L.; Ray, Kausik K.Vallejo-Vaz, Antonio J.; Stevens, Christophe A. T.; Lyons, Alexander R. M.; Dharmayat, Kanika I.; Freiberger, Tomas; Hovingh, G. Kees; Mata, Pedro; Raal, Frederick J.; Santos, Raul D.; Soran, Handrean; Watts, Gerald F.; Abifadel, Marianne; Aguilar-Salinas, Carlos A.; Alhabib, Khalid F.; Alkhnifsawi, Mutaz; Almahmeed, Wael; Alnouri, Fahad; Alonso, Rodrigo; Al-Rasadi, Khalid; Al-Sarraf, Ahmad; Al-Sayed, Nasreen; Araujo, Francisco; Ashavaid, Tester F.; Banach, Maciej; Béliard, Sophie; Benn, Marianne; Binder, Christoph J.; Bogsrud, Martin P.; Bourbon, Mafalda; Chlebus, Krzysztof; Corral, Pablo; Davletov, Kairat; Descamps, Olivier S.; Durst, Ronen; Ezhov, Marat; Gaita, Dan; Genest, Jacques; Groselj, Urh; Harada-Shiba, Mariko; Holven, Kirsten B.; Kayikcioglu, Meral; Khovidhunkit, Weerapan; Lalic, Katarina; Latkovskis, Gustavs; Laufs, Ulrich; Liberopoulos, Evangelos; Lima-Martinez, Marcos M.; Lin, Jie; Maher, Vincent; Marais, A. David; März, Winfried; Mirrakhimov, Erkin; Miserez, André R.; Mitchenko, Olena; Nawawi, Hapizah; Nordestgaard, Børge G.; Panayiotou, Andrie G.; Paragh, György; Petrulioniene, Zaneta; Pojskic, Belma; Postadzhiyan, Arman; Raslova, Katarina; Reda, Ashraf; Reiner, Željko; Sadiq, Fouzia; Sadoh, Wilson Ehidiamen; Schunkert, Heribert; Shek, Aleksandr B.; Stoll, Mario; Stroes, Erik; Su, Ta-Chen; Subramaniam, Tavintharan; Susekov, Andrey V.; Tilney, Myra; Tomlinson, Brian; Truong, Thanh Huong; Tselepis, Alexandros D.; Tybjærg-Hansen, Anne; Vázquez Cárdenas, Alejandra; Viigimaa, Margus; Wang, Luya; Yamashita, Shizuya; Kastelein, John J. P.; Bruckert, Eric; Vohnout, Branislav; Schreier, Laura; Pang, Jing; Ebenbichler, Christoph; Dieplinger, Hans; Innerhofer, Reinhold; Winhofer-Stöckl, Yvonne; Greber-Platzer, Susanne; Krychtiuk, Konstantin; Speidl, Walter; Toplak, Hermann; Widhalm, Kurt; Stulnig, Thomas; Huber, Kurt; Höllerl, Florian; Rega-Kaun, Gersina; Kleemann, Lucas; Mäser, Martin; Scholl-Bürgi, Sabine; Säly, Christoph; Mayer, Florian J.; Sablon, Gaelle; Tarantino, Eric; Nzeyimana, Charlotte; Pojskic, Lamija; Sisic, Ibrahim; Nalbantic, Azra D.; Jannes, Cinthia E.; Pereira, Alexandre C.; Krieger, Jose E.; Petrov, Ivo; Goudev, Assen; Nikolov, Fedya; Tisheva, Snejana; Yotov, Yoto; Tzvetkov, Ivajlo; Baass, Alexis; Bergeron, Jean; Bernard, Sophie; Brisson, Diane; Brunham, Liam R.; Cermakova, Lubomira; Couture, Patrick; Francis, Gordon A.; Gaudet, Daniel; Hegele, Robert A.; Khoury, Etienne; Mancini, G. B. John; Mccrindle, Brian W.; Paquette, Martine; Ruel, Isabelle; Cuevas, Ada; Asenjo, Sylvia; Wang, Xumin; Meng, Kang; Song, Xiantao; Yong, Qiang; Jiang, Tao; Liu, Ziyou; Duan, Yanyu; Hong, Jing; Ye, Pucong; Chen, Yan; Qi, Jianguang; Liu, Zesen; Li, Yuntao; Zhang, Chaoyi; Peng, Jie; Yang, Ya; Yu, Wei; Wang, Qian; Yuan, Hui; Cheng, Shitong; Jiang, Long; Chong, Mei; Jiao, Jian; Wu, Yue; Wen, Wenhui; Xu, Liyuan; Zhang, Ruiying; Qu, Yichen; He, Jianxun; Fan, Xuesong; Wang, Zhenjia; Chow, Elaine; Pećin, Ivan; Perica, Dražen; Symeonides, Phivos; Vrablik, Michal; Ceska, Richard; Soska, Vladimir; Tichy, Lukas; Adamkova, Vera; Franekova, Jana; Cifkova, Renata; Kraml, Pavel; Vonaskova, Katerina; Cepova, Jana; Dusejovska, Magdalena; Pavlickova, Lenka; Blaha, Vladimir; Rosolova, Hana; Nussbaumerova, Barbora; Cibulka, Roman; Vaverkova, Helena; Cibickova, Lubica; Krejsova, Zdenka; Rehouskova, Katerina; Malina, Pavel; Budikova, Milena; Palanova, Vaclava; Solcova, Lucie; Lubasova, Alena; Podzimkova, Helena; Bujdak, Juraj; Vesely, Jiri; Jordanova, Marta; Salek, Tomas; Urbanek, Robin; Zemek, Stanislav; Lacko, Jan; Halamkova, Hana; Machacova, Sona; Mala, Sarka; Cubova, Eva; Valoskova, Katerina; Burda, Lukas; Bendary, Ahmed; Daoud, Ihab; Emil, Sameh; Elbahry, Atef; Rafla, Samir; Sanad, Osama; Kazamel, Ghada; Ashraf, Mohamed; Sobhy, Mohamed; El-Hadidy, Amro; Shafy, Mohamed A.; Kamal, Saif; Bendary, Mohamed; Talviste, Grete; Angoulvant, Denis; Boccara, Franck; Cariou, Bertrand; Carreau, Valérie; Carrie, Alain; Charrieres, Sybil; Cottin, Yves; Di-Fillipo, Mathilde; Ducluzeau, Pierre H.; Dulong, Sonia; Durlach, Vincent; Farnier, Michel; Ferrari, Emile; Ferrieres, Dorota; Ferrieres, Jean; Gallo, Antonio; Hankard, Regis; Inamo, Jocelyne; Lemale, Julie; Moulin, Philippe; Paillard, François; Peretti, Noel; Perrin, Agnès; Pradignac, Alain; Rabes, Jean P.; Rigalleau, Vincent; Sultan, Ariane; Schiele, François; Tounian, Patrick; Valero, René; Verges, Bruno; Yelnik, Cécile; Ziegler, Olivier; Haack, Ira A.; Schmidt, Nina; Dressel, Alexander; Klein, Isabel; Christmann, Jutta; Sonntag, Antonia; Stumpp, Christine; Boger, Diana; Biedermann, Dana; Usme, Monica M. N.; Beil, F. Ulrich; Klose, Gerald; König, Christel; Gouni-Berthold, Ioanna; Otte, Britta; Böll, Gereon; Kirschbaum, Anja; Merke, Jürgen; Scholl, Johannes; Segiet, Thomas; Gebauer, Marco; Predica, Florentina; Mayer, Manfred; Leistikow, Frank; Füllgraf-Horst, Sabine; Müller, Cornelius; Schüler, Melanie; Wiener, Judith; Hein, Konrad; Baumgartner, Peter; Kopf, Stefan; Busch, Reinhold; Schömig, Michael; Matthias, Stephan; Allendorf-Ostwald, Nicole; Fink, Bruno; Böhm, Dieter; Jäkel, Alexander; Koschker, Ann-Cathrin; Schweizer, Rüdiger; Vogt, Anja; Parhofer, Klaus; König, Wolfgang; Reinhard, Wibke; Bäßler, Andrea; Stadelmann, Alexander; Schrader, Volker; Katzmann, Julius; Tarr, Adrienne; Steinhagen-Thiessen, Elisabeth; Kassner, Ursula; Paulsen, Gerret; Homberger, Jürgen; Zemmrich, Claudia; Seeger, Wolfgang; Biolik, Kathrin; Deiss, Dorothee; Richter, Corinna; Pantchechnikova, Elina; Dorn, Elena; Schatz, Ulrike; Julius, Ulrich; Spens, Antje; Wiesner, Tobias; Scholl, Michael; Rizos, Christos V.; Sakkas, Nikolaos; Elisaf, Moses; Skoumas, Ioannis; Tziomalos, Konstantinos; Rallidis, Loukianos; Kotsis, Vasileios; Doumas, Michalis; Athyros, Vasileios; Skalidis, Emmanouil; Kolovou, Genovefa; Garoufi, Anastasi

Symmetry plane correlations in Pb–Pb collisions at √sNN = 2.76 TeV

A newly developed observable for correlations between symmetry planes, which characterize the direction of the anisotropic emission of produced particles, is measured in Pb-Pb collisions at sNN−−−√=2.76 TeV with ALICE. This so-called Gaussian Estimator allows for the first time the study of these quantities without the influence of correlations between different flow amplitudes. The centrality dependence of various correlations between two, three and four symmetry planes is presented. The ordering of magnitude between these symmetry plane correlations is discussed and the results of the Gaussian Estimator are compared with measurements of previously used estimators. The results utilizing the new estimator lead to significantly smaller correlations than reported by studies using the Scalar Product method. Furthermore, the obtained symmetry plane correlations are compared to state-of-the-art hydrodynamic model calculations for the evolution of heavy-ion collisions. While the model predictions provide a qualitative description of the data, quantitative agreement is not always observed, particularly for correlators with significant non-linear response of the medium to initial state anisotropies of the collision system. As these results provide unique and independent information, their usage in future Bayesian analysis can further constrain our knowledge on the properties of the QCD matter produced in ultrarelativistic heavy-ion collisions

Direct observation of the dead-cone effect in quantum chromodynamics

At particle collider experiments, elementary particle interactions with large momentum transfer produce quarks and gluons (known as partons) whose evolution is governed by the strong force, as described by the theory of quantum chromodynamics (QCD) [1]. The vacuum is not transparent to the partons and induces gluon radiation and quark pair production in a process that can be described as a parton shower [2]. Studying the pattern of the parton shower is one of the key experimental tools in understanding the properties of QCD. This pattern is expected to depend on the mass of the initiating parton, through a phenomenon known as the dead-cone effect, which predicts a suppression of the gluon spectrum emitted by a heavy quark of mass m and energy E, within a cone of angular size m/E around the emitter [3]. A direct observation of the dead-cone effect in QCD has not been possible until now, due to the challenge of reconstructing the cascading quarks and gluons from the experimentally accessible bound hadronic states. Here we show the first direct observation of the QCD dead-cone by using new iterative declustering techniques [4, 5] to reconstruct the parton shower of charm quarks. This result confirms a fundamental feature of QCD, which is derived more generally from its origin as a gauge quantum field theory. Furthermore, the measurement of a dead-cone angle constitutes the first direct experimental observation of the non-zero mass of the charm quark, which is a fundamental constant in the standard model of particle physics.The direct measurement of the QCD dead cone in charm quark fragmentation is reported, using iterative declustering of jets tagged with a fully reconstructed charmed hadron.In particle collider experiments, elementary particle interactions with large momentum transfer produce quarks and gluons (known as partons) whose evolution is governed by the strong force, as described by the theory of quantum chromodynamics (QCD). These partons subsequently emit further partons in a process that can be described as a parton shower which culminates in the formation of detectable hadrons. Studying the pattern of the parton shower is one of the key experimental tools for testing QCD. This pattern is expected to depend on the mass of the initiating parton, through a phenomenon known as the dead-cone effect, which predicts a suppression of the gluon spectrum emitted by a heavy quark of mass $m_{\rm{Q}}$ and energy $E$, within a cone of angular size $m_{\rm{Q}}$/$E$ around the emitter. Previously, a direct observation of the dead-cone effect in QCD had not been possible, owing to the challenge of reconstructing the cascading quarks and gluons from the experimentally accessible hadrons. We report the direct observation of the QCD dead cone by using new iterative declustering techniques to reconstruct the parton shower of charm quarks. This result confirms a fundamental feature of QCD. Furthermore, the measurement of a dead-cone angle constitutes a direct experimental observation of the non-zero mass of the charm quark, which is a fundamental constant in the standard model of particle physics