Measurement of the production of (anti)nuclei in p–Pb collisions at sNN=8.16TeV

Measurements of (anti)proton, (anti)deuteron, and (anti)3He production in the rapidity range -1 > y > 0 as a function of the transverse momentum and event multiplicity in p–Pb collisions at a center-of-mass energy per nucleon–nucleon pair sqrt(sNN) = 8.16 TeV are presented. The coalescence parameters B2 and B3, measured as a function of the transverse momentum per nucleon and of the mean charged-particle multiplicity density, confirm a smooth evolution from low to high multiplicity across different collision systems and energies. The ratios between (anti)deuteron and (anti)3He yields and those of (anti)protons are also reported as a function of the mean charged-particle multiplicity density. A comparison with the predictions of the statistical hadronization and coalescence models for different collision systems and center-of-mass energies favors the coalescence description for the deuteron-to-proton yield ratio with respect to the canonical statistical model

Polarization of Λ and Λ¯ Hyperons along the Beam Direction in Pb-Pb Collisions at √sNN = 5.02 TeV

The polarization of the Lambda and (Lambda) over bar hyperons along the beam (z) direction, P-z, has been measured in Pb-Pb collisions at root s(NN) = 5.02 TeV recorded with ALICE at the Large Hadron Collider (LHC). The main contribution to P-z comes from elliptic flow-induced vorticity and can be characterized by the second Fourier sine coefficient P-z,P-s2 = < P-z sin(2 phi - 2 Psi(2))>, where phi is the hyperon azimuthal emission angle and Psi(2) is the elliptic flow plane angle. We report the measurement of P-z,P-s2 for different collision centralities and in the 30%-50% centrality interval as a function of the hyperon transverse momentum and rapidity. The P-z,P-s2 is positive similarly as measured by the STAR Collaboration in Au-Au collisions at root s(NN) = 200 GeV, with somewhat smaller amplitude in the semicentral collisions. This is the first experimental evidence of a nonzero hyperon P-z in Pb-Pb collisions at the LHC. The comparison of the measured P-z,P-s2 with the hydrodynamic model calculations shows sensitivity to the competing contributions from thermal and the recently found shear-induced vorticity, as well as to whether the polarization is acquired at the quark-gluon plasma or the hadronic phase

Study of very forward energy and its correlation with particle production at midrapidity in pp and p-Pb collisions at the LHC

The energy deposited at very forward rapidities (very forward energy) is a powerful tool for characterising proton fragmentation in pp and p-Pb collisions. The correlation of very forward energy with particle production at midrapidity provides direct insights into the initial stages and the subsequent evolution of the collision. Furthermore, the correlation with the production of particles with large transverse momenta at midrapidity provides information complementary to the measurements of the underlying event, which are usually interpreted in the framework of models implementing centrality-dependent multiple parton interactions. Results about very forward energy, measured by the ALICE zero degree calorimeters (ZDCs), and its dependence on the activity measured at midrapidity in pp collisions at √s = 13 TeV and in p-Pb collisions at √sNN = 8.16 TeV are discussed. The measurements performed in pp collisions are compared with the expectations of three hadronic interaction event generators: PYTHIA 6 (Perugia 2011 tune), PYTHIA 8 (Monash tune), and EPOS LHC. These results provide new constraints on the validity of models in describing the beam remnants at very forward rapidities, where perturbative QCD cannot be used

Neutral to charged kaon yield fluctuations in Pb – Pb collisions at sNN=2.76 TeV

We present the first measurement of event-by-event fluctuations in the kaon sector in Pb – Pb collisions at √sNN = 2.76 TeV with the ALICE detector at the LHC. The robust fluctuation correlator νdyn is used to evaluate the magnitude of fluctuations of the relative yields of neutral and charged kaons, as well as the relative yields of charged kaons, as a function of collision centrality and selected kinematic ranges. While the correlator νdyn[K+, K− ] exhibits a scaling approximately in inverse proportion of the charged particle multiplicity, νdyn[K0 S , K± ] features a significant deviation from such scaling. Within uncertainties, the value of νdyn[K0S , K± ] is independent of the selected transverse momentum interval, while it exhibits a pseudorapidity dependence. The results are compared with HIJING, AMPT and EPOS–LHC predictions, and are further discussed in the context of the possible production of disoriented chiral condensates in central Pb – Pb collisions

Coherent J/ψ and ψ photoproduction at midrapidity in ultra-peripheral Pb–Pb collisions at √sNN = 5.02 TeV

The coherent photoproduction of J/ψJ/ψ and ψ′ψ′ mesons was measured in ultra-peripheral Pb–Pb collisions at a center-of-mass energy sNN−−−√ = 5.02sNN = 5.02 TeV with the ALICE detector. Charmonia are detected in the central rapidity region for events where the hadronic interactions are strongly suppressed. The J/ψJ/ψ is reconstructed using the dilepton (l+l−l+l−) and proton–antiproton decay channels, while for the ψ′ψ′ the dilepton and the l+l−π+π−l+l−π+π− decay channels are studied. The analysis is based on an event sample corresponding to an integrated luminosity of about 233 μb−1μb−1. The results are compared with theoretical models for coherent J/ψJ/ψ and ψ′ψ′ photoproduction. The coherent cross section is found to be in a good agreement with models incorporating moderate nuclear gluon shadowing of about 0.64 at a Bjorken-x of around 6×10−46×10−4, such as the EPS09 parametrization, however none of the models is able to fully describe the rapidity dependence of the coherent J/ψJ/ψ cross section including ALICE measurements at forward rapidity. The ratio of ψ′ψ′ to J/ψJ/ψ coherent photoproduction cross sections was also measured and found to be consistent with the one for photoproduction off protons.publishedVersio

Measurement of beauty and charm production in pp collisions at √s = 5.02 TeV via non-prompt and prompt D mesons

The pT-differential production cross sections of prompt and non-prompt (produced in beauty-hadron decays) D mesons were measured by the ALICE experiment at midrapidity (|y| < 0.5) in proton-proton collisions at s√s = 5.02 TeV. The data sample used in the analysis corresponds to an integrated luminosity of (19.3 ± 0.4) nb−1. D mesons were reconstructed from their decays D0 → K−π+, D+ → K−π+π+, and D+s→φπ+→K−K+π+Ds+→φπ+→K−K+π+ and their charge conjugates. Compared to previous measurements in the same rapidity region, the cross sections of prompt D+ and D+sDs+ mesons have an extended pT coverage and total uncertainties reduced by a factor ranging from 1.05 to 1.6, depending on pT, allowing for a more precise determination of their pT-integrated cross sections. The results are well described by perturbative QCD calculations. The fragmentation fraction of heavy quarks to strange mesons divided by the one to non-strange mesons, fs/(fu + fd), is compatible for charm and beauty quarks and with previous measurements at different centre-of-mass energies and collision systems. The bb¯¯¯bb¯ production cross section per rapidity unit at midrapidity, estimated from non-prompt D-meson measurements, is dσbb¯¯¯/dy∣∣|y|<0.5=34.5±2.4(stat)+4.7−2.9(tot.syst)dσbb¯/dy||y|<0.5=34.5±2.4(stat)−2.9+4.7(tot.syst) μb. It is compatible with previous measurements at the same centre-of-mass energy and with the cross section pre- dicted by perturbative QCD calculations.publishedVersio

Energy dependence of ϕ meson production at forward rapidity in pp collisions at the LHC

The production of $\phi$ mesons has been studied in pp collisions at LHC energies with the ALICE detector via the dimuon decay channel in the rapidity region $2.5< y < 4$. Measurements of the differential cross section $\mathrm{d}^2\sigma /\mathrm{d}y \mathrm{d}p_{\mathrm {T}}$ are presented as a function of the transverse momentum ($p_{\mathrm {T}}$) at the center-of-mass energies $\sqrt{s}=5.02$, 8 and 13 TeV and compared with the ALICE results at midrapidity. The differential cross sections at $\sqrt{s}=5.02$ and 13 TeV are also studied in several rapidity intervals as a function of $p_{\mathrm {T}}$, and as a function of rapidity in three $p_{\mathrm {T}}$ intervals. A hardening of the $p_{\mathrm {T}}$-differential cross section with the collision energy is observed, while, for a given energy, $p_{\mathrm {T}}$ spectra soften with increasing rapidity and, conversely, rapidity distributions get slightly narrower at increasing $p_{\mathrm {T}}$. The new results, complementing the published measurements at $\sqrt{s}=2.76$ and 7 TeV, allow one to establish the energy dependence of $\phi$ meson production and to compare the measured cross sections with phenomenological models. None of the considered models manages to describe the evolution of the cross section with $p_{\mathrm {T}}$ and rapidity at all the energies.publishedVersio

Inclusive J / ψ production at midrapidity in pp collisions at √s=13 TeV

open1030siAcknowledgements We wish to thank Mathias Butenschoen, Vincent Cheung, Bernd A. Kniehl, Artem V. Lipatov, Yan-Qing Ma, Raju Venugopalan and Ramona Vogt for kindly providing their calculations. The ALICE Collaboration would like to thank all its engineers and technicians for their invaluable contributions to the construction of the experiment and the CERN accelerator teams for the outstanding performance of the LHC complex. The ALICE Collaboration gratefully acknowledges the resources and support provided by all Grid centres and the Worldwide LHC Computing Grid (WLCG) collaboration. The ALICE Collaboration acknowledges the following funding agencies for their support in building and running the ALICE detector: A. I. Alikhanyan National Science Laboratory (Yerevan Physics Institute) Foundation (ANSL), State Committee of Science and World Federation of Scientists (WFS), Armenia; Austrian Academy of Sciences, Austrian Science Fund (FWF): [M 2467-N36] and Nationalstiftung für Forschung, Technologie und Entwicklung, Austria; Ministry of Communications and High Technologies, National Nuclear Research Center, Azerbaijan; Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Financiadora de Estudos e Projetos (Finep), Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) and Universidade Federal do Rio Grande do Sul (UFRGS), Brazil; Ministry of Education of China (MOEC) , Ministry of Science and Technology of China (MSTC) and National Natural Science Foundation of China (NSFC), China; Ministry of Science and Education and Croatian Science Foundation, Croatia; Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear (CEADEN), Cubaenergía, Cuba; Ministry of Education, Youth and Sports of the Czech Republic, Czech Republic; The Danish Council for Independent Research | Natural Sciences, the VILLUM FONDEN and Danish National Research Foundation (DNRF), Denmark; Helsinki Institute of Physics (HIP), Finland; Commissariat à l’Energie Atomique (CEA) and Institut National de Physique Nucléaire et de Physique des Particules (IN2P3) and Centre National de la Recherche Scientifique (CNRS), France; Bundesministerium für Bildung und Forschung (BMBF) and GSI Helmholtzzentrum für Schwerionenforschung GmbH, Germany; General Secretariat for Research and Technology, Ministry of Education, Research and Religions, Greece; National Research, Development and Innovation Office, Hungary; Department of Atomic Energy Government of India (DAE), Department of Science and Technology, Government of India (DST), University Grants Commission, Government of India (UGC) and Council of Scientific and Industrial Research (CSIR), India; Indonesian Institute of Science, Indonesia; Istituto Nazionale di Fisica Nucleare (INFN), Italy; Institute for Innovative Science and Technology , Nagasaki Institute of Applied Science (IIST), Japanese Ministry of Education, Culture, Sports, Science and Technology (MEXT) and Japan Society for the Promotion of Science (JSPS) KAKENHI, Japan; Consejo Nacional de Ciencia (CONACYT) y Tecnología, through Fondo de Cooperación Internacional en Ciencia y Tecnología (FONCICYT) and Dirección General de Asuntos del Personal Academico (DGAPA), Mexico; Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO), Netherlands; The Research Council of Norway, Norway; Commission on Science and Technology for Sustainable Development in the South (COMSATS), Pakistan; Pontificia Universidad Católica del Perú, Peru; Ministry of Education and Science, National Science Centre and WUT ID-UB, Poland; Korea Institute of Science and Technology Information and National Research Foundation of Korea (NRF), Republic of Korea; Ministry of Education and Scientific Research, Institute of Atomic Physics and Ministry of Research and Innovation and Institute of Atomic Physics, Romania; Joint Institute for Nuclear Research (JINR), Ministry of Education and Science of the Russian Federation, National Research Centre Kurchatov Institute, Russian Science Foundation and Russian Foundation for Basic Research, Russia; Ministry of Education, Science, Research and Sport of the Slovak Republic, Slovakia; National Research Foundation of South Africa, South Africa; Swedish Research Council (VR) and Knut and Alice Wallenberg Foundation (KAW), Sweden; European Organization for Nuclear Research, Switzerland; Suranaree University of Technology (SUT), National Science and Technology Development Agency (NSDTA) and Office of the Higher Education Commission under NRU project of Thailand, Thailand; Turkish Energy, Nuclear and Mineral Research Agency (TENMAK), Turkey; National Academy of Sciences of Ukraine, Ukraine; Science and Technology Facilities Council (STFC), United Kingdom; National Science Foundation of the United States of America (NSF) and United States Department of Energy, Office of Nuclear Physics (DOE NP), United States of America. In addition, individual groups and members have received support from Horizon 2020 and Marie Skłodowska Curie Actions, European Union.We report on the inclusive J / ψ production cross section measured at the CERN Large Hadron Collider in proton–proton collisions at a center-of-mass energy s=13&nbsp;TeV. The J / ψ mesons are reconstructed in the e +e - decay channel and the measurements are performed at midrapidity (| y| &lt; 0.9) in the transverse-momentum interval 0 &lt; pT&lt; 40 GeV/c, using a minimum-bias data sample corresponding to an integrated luminosity Lint=32.2nb-1 and an Electromagnetic Calorimeter triggered data sample with Lint=8.3pb-1. The pT-integrated J / ψ production cross section at midrapidity, computed using the minimum-bias data sample, is dσ/dy|y=0=8.97±0.24(stat)±0.48(syst)±0.15(lumi)μb. An approximate logarithmic dependence with the collision energy is suggested by these results and available world data, in agreement with model predictions. The integrated and pT-differential measurements are compared with measurements in pp collisions at lower energies and with several recent phenomenological calculations based on the non-relativistic QCD and Color Evaporation models.openAcharya S.; Adamova D.; Adler A.; Aglieri Rinella G.; Agnello M.; Agrawal N.; Ahammed Z.; Ahmad S.; Ahn S.U.; Ahuja I.; Akbar Z.; Akindinov A.; Al-Turany M.; Alam S.N.; Aleksandrov D.; Alessandro B.; Alfanda H.M.; Alfaro Molina R.; Ali B.; Ali Y.; Alici A.; Alizadehvandchali N.; Alkin A.; Alme J.; Alt T.; Altenkamper L.; Altsybeev I.; Anaam M.N.; Andrei C.; Andreou D.; Andronic A.; Angeletti M.; Anguelov V.; Antinori F.; Antonioli P.; Anuj C.; Apadula N.; Aphecetche L.; Appelshauser H.; Arcelli S.; Arnaldi R.; Arsene I.C.; Arslandok M.; Augustinus A.; Averbeck R.; Aziz S.; Azmi M.D.; Badala A.; Baek Y.W.; Bai X.; Bailhache R.; Bailung Y.; Bala R.; Balbino A.; Baldisseri A.; Balis B.; Ball M.; Banerjee D.; Barbera R.; Barioglio L.; Barlou M.; Barnafoldi G.G.; Barnby L.S.; Barret V.; Bartels C.; Barth K.; Bartsch E.; Baruffaldi F.; Bastid N.; Basu S.; Batigne G.; Batyunya B.; Bauri D.; Alba J.L.B.; Bearden I.G.; Beattie C.; Belikov I.; Bell Hechavarria A.D.C.; Bellini F.; Bellwied R.; Belokurova S.; Belyaev V.; Bencedi G.; Beole S.; Bercuci A.; Berdnikov Y.; Berdnikova A.; Bergmann L.; Besoiu M.G.; Betev L.; Bhaduri P.P.; Bhasin A.; Bhat I.R.; Bhat M.A.; Bhattacharjee B.; Bhattacharya P.; Bianchi L.; Bianchi N.; Bielcik J.; Bielcikova J.; Biernat J.; Bilandzic A.; Biro G.; Biswas S.; Blair J.T.; Blau D.; Blidaru M.B.; Blume C.; Boca G.; Bock F.; Bogdanov A.; Boi S.; Bok J.; Boldizsar L.; Bolozdynya A.; Bombara M.; Bond P.M.; Bonomi G.; Borel H.; Borissov A.; Bossi H.; Botta E.; Bratrud L.; Braun-Munzinger P.; Bregant M.; Broz M.; Bruno G.E.; Buckland M.D.; Budnikov D.; Buesching H.; Bufalino S.; Bugnon O.; Buhler P.; Buthelezi Z.; Butt J.B.; Bylinkin A.; Bysiak S.A.; Cai M.; Caines H.; Caliva A.; Calvo Villar E.; Camacho J.M.M.; Camacho R.S.; Camerini P.; Canedo F.D.M.; Carnesecchi F.; Caron R.; Castillo Castellanos J.; Casula E.A.R.; Catalano F.; Ceballos Sanchez C.; Chakraborty P.; Chandra S.; Chapeland S.; Chartier M.; Chattopadhyay S.; Chattopadhyay S.; Chauvin A.; Chavez T.G.; Cheng T.; Cheshkov C.; Cheynis B.; Chibante Barroso V.; Chinellato D.D.; Cho S.; Chochula P.; Christakoglou P.; Christensen C.H.; Christiansen P.; Chujo T.; Cicalo C.; Cifarelli L.; Cindolo F.; Ciupek M.R.; Clai G.; Cleymans J.; Colamaria F.; Colburn J.S.; Colella D.; Collu A.; Colocci M.; Concas M.; Conesa Balbastre G.; Conesa del Valle Z.; Contin G.; Contreras J.G.; Coquet M.L.; Cormier T.M.; Cortese P.; Cosentino M.R.; Costa F.; Costanza S.; Crochet P.; Cruz-Torres R.; Cuautle E.; Cui P.; Cunqueiro L.; Dainese A.; Danisch M.C.; Danu A.; Das I.; Das P.; Das P.; Das S.; Dash S.; De S.; De Caro A.; de Cataldo G.; De Cilladi L.; de Cuveland J.; De Falco A.; De Gruttola D.; De Marco N.; De Martin C.; De Pasquale S.; Deb S.; Degenhardt H.F.; Deja K.R.; Stritto L.D.; Delsanto S.; Deng W.; Dhankher P.; Di Bari D.; Di Mauro A.; Diaz R.A.; Dietel T.; Ding Y.; Divia R.; Dixit D.U.; Djuvsland O.; Dmitrieva U.; Do J.; Dobrin A.; Donigus B.; Dordic O.; Dubey A.K.; Dubla A.; Dudi S.; Dukhishyam M.; Dupieux P.; Dzalaiova N.; Eder T.M.; Ehlers R.J.; Eikeland V.N.; Eisenhut F.; Elia D.; Erazmus B.; Ercolessi F.; Erhardt F.; Erokhin A.; Ersdal M.R.; Espagnon B.; Eulisse G.; Evans D.; Evdokimov S.; Fabbietti L.; Faggin M.; Faivre J.; Fan F.; Fantoni A.; Fasel M.; Fecchio P.; Feliciello A.; Feofilov G.; Fernandez Tellez A.; Ferrero A.; Ferretti A.; Feuillard V.J.G.; Figiel J.; Filchagin S.; Finogeev D.; Fionda F.M.; Fiorenza G.; Flor F.; Flores A.N.; Foertsch S.; Foka P.; Fokin S.; Fragiacomo E.; Frajna E.; Fuchs U.; Funicello N.; Furget C.; Furs A.; Gaardhoje J.J.; Gagliardi M.; Gago A.M.; Gal A.; Galvan C.D.; Ganoti P.; Garabatos C.; Garcia J.R.A.; Garcia-Solis E.; Garg K.; Gargiulo C.; Garibli A.; Garner K.; Gasik P.; Gauger E.F.; Gautam A.; Gay Ducati M.B.; Germain M.; Ghosh P.; Ghosh S.K.; Giacalone M.; Gianotti P.; Giubellino P.; Giubilato P.; Glaenzer A.M.C.; Glassel P.; Goh D.J.Q.; Gonzalez V.; Gonzalez-Trueba L.H.; Gorbunov S.; Gorgon M.; Gorlich L.; Gotovac S.; Grabski V.; Graczykowski L.K.; Greiner L.; Grelli A.; Grigoras C.; Grigoriev V.; Grigoryan S.; Groettvik O.S.; Grosa F.; Grosse-Oetringhaus J.F.; Grosso R.; Guardiano G.G.; Guernane R.; Guilbaud M.; Gulbrandsen K.; Gunji T.; Guo W.; Gupta A.; Gupta R.; Guzman S.P.; Gyulai L.; Habib M.K.; Hadjidakis C.; Halimoglu G.; Hamagaki H.; Hamar G.; Hamid M.; Hannigan R.; Haque M.R.; Harlenderova A.; Harris J.W.; Harton A.; Hasenbichler J.A.; Hassan H.; Hatzifotiadou D.; Hauer P.; Havener L.B.; Hayashi S.; Heckel S.T.; Hellbar E.; Helstrup H.; Herman T.; Hernandez E.G.; Herrera Corral G.; Herrmann F.; Hetland K.F.; Hillemanns H.; Hills C.; Hippolyte B.; Hofman B.; Hohlweger B.; Honermann J.; Hong G.H.; Horak D.; Hornung S.; Horzyk A.; Hosokawa R.; Hou Y.; Hristov P.; Hughes C.; Huhn P.; Humanic T.J.; Hushnud H.; Husova L.A.; Hutson A.; Hutter D.; Iddon J.P.; Ilkaev R.; Ilyas H.; Inaba M.; Innocenti G.M.; Ippolitov M.; Isakov A.; Islam M.S.; Ivanov M.; Ivanov V.; Izucheev V.; Jablonski M.; Jacak B.; Jacazio N.; Jacobs P.M.; Jadlovska S.; Jadlovsky J.; Jaelani S.; Jahnke C.; Jakubowska M.J.; Jalotra A.; Janik M.A.; Janson T.; Jercic M.; Jevons O.; Jimenez A.A.P.; Jonas F.; Jones P.G.; Jowett J.M.; Jung J.; Jung M.; Junique A.; Jusko A.; Kaewjai J.; Kalinak P.; Kalteyer A.S.; Kalweit A.; Kaplin V.; Kar S.; Karasu Uysal A.; Karatovic D.; Karavichev O.; Karavicheva T.; Karczmarczyk P.; Karpechev E.; Kazantsev A.; Kebschull U.; Keidel R.; Keijdener D.L.D.; Keil M.; Ketzer B.; Khabanova Z.; Khan A.M.; Khan S.; Khanzadeev A.; Kharlov Y.; Khatun A.; Khuntia A.; Kileng B.; Kim B.; Kim C.; Kim D.J.; Kim E.J.; Kim J.; Kim J.S.; Kim J.; Kim J.; Kim J.; Kim M.; Kim S.; Kim T.; Kirsch S.; Kisel I.; Kiselev S.; Kisiel A.; Kitowski J.P.; Klay J.L.; Klein J.; Klein S.; Klein-Bosing C.; Kleiner M.; Klemenz T.; Kluge A.; Knospe A.G.; Kobdaj C.; Kohler M.K.; Kollegger T.; Kondratyev A.; Kondratyeva N.; Kondratyuk E.; Konig J.; Konigstorfer S.A.; Konopka P.J.; Kornakov G.; Koryciak S.D.; Koska L.; Kotliarov A.; Kovalenko O.; Kovalenko V.; Kowalski M.; Kralik I.; Kravcakova A.; Kreis L.; Krivda M.; Krizek F.; Gajdosova K.K.; Kroesen M.; Kruger M.; Kryshen E.; Krzewicki M.; Kucera V.; Kuhn C.; Kuijer P.G.; Kumaoka T.; Kumar D.; Kumar L.; Kumar N.; Kundu S.; Kurashvili P.; Kurepin A.; Kurepin A.B.; Kuryakin A.; Kushpil S.; Kvapil J.; Kweon M.J.; Kwon J.Y.; Kwon Y.; La Pointe S.L.; La Rocca P.; Lai Y.S.; Lakrathok A.; Lamanna M.; Langoy R.; Lapidus K.; Larionov P.; Laudi E.; Lautner L.; Lavicka R.; Lazareva T.; Lea R.; Lehrbach J.; Lemmon R.C.; Leon Monzon I.; Lesser E.D.; Lettrich M.; Levai P.; Li X.; Li X.L.; Lien J.; Lietava R.; Lim B.; Lim S.H.; Lindenstruth V.; Lindner A.; Lippmann C.; Liu A.; Liu D.H.; Liu J.; Lofnes I.M.; Loginov V.; Loizides C.; Loncar P.; Lopez J.A.; Lopez X.; Lopez Torres E.; Luhder J.R.; Lunardon M.; Luparello G.; Ma Y.G.; Maevskaya A.; Mager M.; Mahmoud T.; Maire A.; Malaev M.; Malik N.M.; Malik Q.W.; Malinina L.; Mal'Kevich D.; Mallick N.; Malzacher P.; Mandaglio G.; Manko V.; Manso F.; Manzari V.; Mao Y.; Mares J.; Margagliotti G.V.; Margotti A.; Marin A.; Markert C.; Marquard M.; Martin N.A.; Martinengo P.; Martinez J.L.; Martinez M.I.; Martinez Garcia G.; Masciocchi S.; Masera M.; Masoni A.; Massacrier L.; Mastroserio A.; Mathis A.M.; Matonoha O.; Matuoka P.F.T.; Matyja A.; Mayer C.; Mazuecos A.L.; Mazzaschi F.; Mazzilli M.; Mazzoni M.A.; Mdhluli J.E.; Mechler A.F.; Meddi F.; Melikyan Y.; Menchaca-Rocha A.; Meninno E.; Menon A.S.; Meres M.; Mhlanga S.; Miake Y.; Micheletti L.; Migliorin L.C.; Mihaylov D.L.; Mikhaylov K.; Mishra A.N.; Miskowiec D.; Modak A.; Mohanty A.P.; Mohanty B.; Mohisin Khan M.; Molander M.A.; Moravcova Z.; Mordasini C.; Moreira De Godoy D.A.; Moreno L.A.P.; Morozov I.; Morsch A.; Mrnjavac T.; Muccifora V.; Mudnic E.; Muhlheim D.; Muhuri S.; Mulligan J.D.; Mulliri A.; Munhoz M.G.; Munzer R.H.; Murakami H.; Murray S.; Musa L.; Musinsky J.; Myrcha J.W.; Naik B.; Nair R.; Nandi B.K.; Nania R.; Nappi E.; Nassirpour A.F.; Nath A.; Nattrass C.; Neagu A.; Nellen L.; Nesbo S.V.; Neskovic G.; Nesterov D.; Nielsen B.S.; Nikolaev S.; Nikulin S.; Nikulin V.; Noferini F.; Noh S.; Nomokonov P.; Norman J.; Novitzky N.; Nowakowski P.; Nyanin A.; Nystrand J.; Ogino M.; Ohlson A.; Okorokov V.A.; Oleniacz J.; Oliveira Da Silva A.C.; Oliver M.H.; Onnerstad A.; Oppedisano C.; Ortiz Velasquez A.; Osako T.; Oskarsson A.; Otwinowski J.; Oya M.; Oyama K.; Pachmayer Y.; Padhan S.; Pagano D.; Paic G.; Palasciano A.; Pan J.; Panebianco S.; Pareek P.; Park J.; Parkkila J.E.; Pathak S.P.; Patra R.N.; Paul B.; Pei H.; Peitzmann T.; Peng X.; Pereira L.G.; Pereira Da Costa H.; Peresunko D.; Perez G.M.; Perrin S.; Pestov Y.; Petracek V.; Petrovici M.; Pezzi R.P.; Piano S.; Pikna M.; Pillot P.; Pinazza O.; Pinsky L.; Pinto C.; Pisano S.; Ploskon M.; Planinic M.; Pliquett F.; Poghosyan M.G.; Polichtchouk B.; Politano S.; Poljak N.; Pop A.; Porteboeuf-Houssais S.; Porter J.; Pozdniakov V.; Prasad S.K.; Preghenella R.; Prino F.; Pruneau C.A.; Pshenichnov I.; Puccio M.; Qiu S.; Quaglia L.; Quishpe R.E.; Ragoni S.; Rakotozafindrabe A.; Ramello L.; Rami F.; Ramirez S.A.R.; Ramos A.G.T.; Rancien T.A.; Raniwala R.; Raniwala S.; Rasanen S.S.; Rath R.; Ravasenga I.; Read K.F.; Redelbach A.R.; Redlich K.; Rehman A.; Reichelt P.; Reidt F.; Reme-ness H.A.; Renfordt R.; Rescakova Z.; Reygers K.; Riabov A.; Riabov V.; Richert T.; Richter M.; Riegler W.; Riggi F.; Ristea C.; Rodriguez Cahuantzi M.; Roed K.; Rogalev R.; Rogochaya E.; Rogoschinski T.S.; Rohr D.; Rohrich D.; Rojas P.F.; Rokita P.S.; Ronchetti F.; Rosano A.; Rosas E.D.; Rossi A.; Rotondi A.; Roy A.; Roy P.; Roy S.; Rubini N.; Rueda O.V.; Rui R.; Rumyantsev B.; Russek P.G.; Rustamov A.; Ryabinkin E.; Ryabov Y.; Rybicki A.; Rytkonen H.; Rzesa W.; Saarimaki O.A.M.; Sadek R.; Sadovsky S.; Saetre J.; Safarik K.; Saha S.K.; Saha S.; Sahoo B.; Sahoo P.; Sahoo R.; Sahoo S.; Sahu D.; Sahu P.K.; Saini J.; Sakai S.; Sambyal S.; Samsonov V.; Sarkar D.; Sarkar N.; Sarma P.; Sarti V.M.; Sas M.H.P.; Schambach J.; Scheid H.S.; Schiaua C.; Schicker R.; Schmah A.; Schmidt C.; Schmidt H.R.; Schmidt M.O.; Schmidt M.; Schmidt N.V.; Schmier A.R.; Schotter R.; Schukraft J.; Schutz Y.; Schwarz K.; Schweda K.; Scioli G.; Scomparin E.; Seger J.E.; Sekiguchi Y.; Sekihata D.; Selyuzhenkov I.; Senyukov S.; Seo J.J.; Serebryakov D.; Serksnyte L.; Sevcenco A.; Shaba T.J.; Shabanov A.; Shabetai A.; Shahoyan R.; Shaikh W.; Shangaraev A.; Sharma A.; Sharma H.; Sharma M.; Sharma N.; Sharma S.; Sharma U.; Sheibani O.; Shigaki K.; Shimomura M.; Shirinkin S.; Shou Q.; Sibiriak Y.; Siddhanta S.; Siemiarczuk T.; Silva T.F.; Silvermyr D.; Simantathammakul T.; Simonetti G.; Singh B.; Singh R.; Singh R.; Singh R.; Singh V.K.; Singhal V.; Sinha T.; Sitar B.; Sitta M.; Skaali T.B.; Skorodumovs G.; Slupecki M.; Smirnov N.; Snellings R.J.M.; Soncco C.; Song J.; Songmoolnak A.; Soramel F.; Sorensen S.; Sputowska I.; Stachel J.; Stan I.; Steffanic P.J.; Stiefelmaier S.F.; Stocco D.; Storehaug I.; Storetvedt M.M.; Stylianidis C.P.; Suaide A.A.P.; Sugitate T.; Suire C.; Sukhanov M.; Suljic M.; Sultanov R.; Sumbera M.; Sumberia V.; Sumowidagdo S.; Swain S.; Szabo A.; Szarka I.; Tabassam U.; Taghavi S.F.; Taillepied G.; Takahashi J.; Tambave G.J.; Tang S.; Tang Z.; Tapia Takaki J.D.; Tarhini M.; Tarzila M.G.; Tauro A.; Tejeda Munoz G.; Telesca A.; Terlizzi L.; Terrevoli C.; Tersimonov G.; Thakur S.; Thomas D.; Tieulent R.; Tikhonov A.; Timmins A.R.; Tkacik M.; Toia A.; Topilskaya N.; Toppi M.; Torales-Acosta F.; Tork T.; Torres S.R.; Trifiro A.; Tripathy S.; Tripathy T.; Trogolo S.; Trubnikov V.; Trzaska W.H.; Trzcinski T.P.; Trzeciak B.A.; Tumkin A.; Turrisi R.; Tveter T.S.; Ullaland K.; Uras A.; Urioni M.; Usai G.L.; Vala M.; Valle N.; Vallero S.; van der Kolk N.; van Doremalen L.V.R.; van Leeuwen M.; Vande Vyvre P.; Varga D.; Varga Z.; Varga-Kofarago M.; Vargas A.; Vasileiou M.; Vasiliev A.; Vazquez Doce O.; Vechernin V.; Vercellin E.; Vergara Limon S.; Vermunt L.; Vertesi R.; Verweij M.; Vickovic L.; Vilakazi Z.; Villalobos Baillie O.; Vino G.; Vinogradov A.; Virgili T.; Vislavicius V.; Vodopyanov A.; Volkel B.; Volkl M.A.; Voloshin K.; Voloshin S.A.; Volpe G.; von Haller B.; Vorobyev I.; Voscek D.; Vozniuk N.; Vrlakova J.; Wagner B.; Wang C.; Wang D.; Weber M.; Weelden R.J.G.V.; Wegrzynek A.; Wenzel S.C.; Wessels J.P.; Wiechula J.; Wikne J.; Wilk G.; Wilkinson J.; Willems G.A.; Windelband B.; Winn M.; Witt W.E.; Wright J.R.; Wu W.; Wu Y.; Xu R.; Yadav A.K.; Yalcin S.; Yamaguchi Y.; Yamakawa K.; Yang S.; Yano S.; Yin Z.; Yokoyama H.; Yoo I.-K.; Yoon J.H.; Yuan S.; Yuncu A.; Zaccolo V.; Zampolli C.; Zanoli H.J.C.; Zardoshti N.; Zarochentsev A.; Zavada P.; Zaviyalov N.; Zhalov M.; Zhang B.; Zhang S.; Zhang X.; Zhang Y.; Zherebchevskii V.; Zhi Y.; Zhigareva N.; Zhou D.; 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Forward rapidity J/ψ production as a function of charged-particle multiplicity in pp collisions at s \sqrt{s} = 5.02 and 13 TeV

The production of J/ψ is measured as a function of charged-particle multiplicity at forward rapidity in proton-proton (pp) collisions at center-of-mass energies √s = 5.02 and 13 TeV. The J/ψ mesons are reconstructed via their decay into dimuons in the rapidity interval (2.5 < y < 4.0), whereas the charged-particle multiplicity density (dNch/dη) is measured at midrapidity (|η| < 1). The production rate as a function of multiplicity is reported as the ratio of the yield in a given multiplicity interval to the multiplicity-integrated one. This observable shows a linear increase with charged-particle multiplicity normalized to the corresponding average value for inelastic events (dNch/dη/〈dNch/dη〉), at both the colliding energies. Measurements are compared with available ALICE results at midrapidity and theoretical model calculations. First measurement of the mean transverse momentum (〈pT〉) of J/ψ in pp collisions exhibits an increasing trend as a function of dNch/dη/〈dNch/dη〉 showing a saturation towards high charged-particle multiplicities

Observation of a multiplicity dependence in the pT-differential charm baryon-to-meson ratios in proton–proton collisions at √ s = 13 TeV

The production of prompt D-0, D-s(+) and Lambda(+)(c) hadrons, and their ratios, D-s(+)/D-0 and Lambda(+)(c)/D-0, are measured in proton-proton collisions at root s = 13 TeV at midrapidity (vertical bar y vertical bar < 0.5) with the ALICE detector at the LHC. The measurements are performed as a function of the charm-hadron transverse momentum (p(T)) in intervals of charged-particle multiplicity, measured with two multiplicity estimators covering different pseudorapidity regions. While the strange to non-strange D-s(+)/D-0 ratio indicates no significant multiplicity dependence, the baryon-to-meson P-T-differential Lambda(+)(c)/D-0 ratio shows a multiplicity-dependent enhancement, with a significance of 5.3 sigma for 1 < p(T) < 12 GeV/c, comparing the highest multiplicity interval with respect to the lowest one. The measurements are compared with a theoretical model that explains the multiplicity dependence by a canonical treatment of quantum charges in the statistical hadronisation approach, and with predictions from event generators that implement colour reconnection mechanisms beyond the leading colour approximation to model the hadronisation process. The Lambda(+)(c)/D-0 ratios as a function of p(T) present a similar shape and magnitude as the Lambda/K-s(0) ratios in comparable multiplicity intervals, suggesting a potential common mechanism for light- and charmhadron formation, with analogous multiplicity dependence. The p(T)-integrated ratios, extrapolated down to p(T) = 0, do not show a significant dependence on multiplicity within the uncertainties. (C) 2022 European Organization for Nuclear Research. Published by Elsevier B.V