Upsilon suppression at forward rapidity in Pb-Pb collisions at root s(NN)=5.02 TeV

Inclusive Υ(1S) and Υ(2S) production have been measured in Pb–Pb collisions at the centre-of-mass energy per nucleon–nucleon pair √sNN = 5.02 TeV, using the ALICE detector at the CERN LHC. The Υ mesons are reconstructed in the centre-of-mass rapidity interval 2.5 < y < 4 and in the transverse-momentum range pT < 15 GeV/c, via their decays to muon pairs. In this Letter, we present results on the inclusive Υ(1S) nuclear modification factor RAA as a function of collision centrality, transverse momentum and rapidity. The Υ(1S) and Υ(2S) RAA, integrated over the centrality range 0–90%, are 0.37± 0.02(stat) ± 0.03(syst) and 0.10 ± 0.04(stat) ± 0.02(syst), respectively, leading to a ratio RΥ(2S)/RΥ(1S) of 0.28±0.12(stat)±0.06(syst). The observed Υ(1S) suppression increases with the centrality of the collision and no significant variation is observed as a function of transverse momentum and rapidity

Centrality and pseudorapidity dependence of the charged-particle multiplicity density in Xe–Xe collisions at √sNN = 5.44 TeV

In this Letter, the ALICE Collaboration presents the first measurements of the charged-particle multiplicity density, dNch/dη, and total charged-particle multiplicity, Nchtot, in Xe–Xe collisions at a centre-of-mass energy per nucleon–nucleon pair of √sNN = 5.44 TeV. The measurements are performed as a function of collision centrality over a wide pseudorapidity range of −3.5<η<5. The values of dNch/dη at mid-rapidity and Nchtot for central collisions, normalised to the number of nucleons participating in the collision (Npart) as a function of √sNN follow the trends established in previous heavy-ion measurements. The same quantities are also found to increase as a function of Npart, and up to the 5% most central collisions the trends are the same as the ones observed in Pb–Pb at a similar energy. For more central collisions, the Xe–Xe scaled multiplicities exceed those in Pb–Pb for a similar Npart. The results are compared to phenomenological models and theoretical calculations based on different mechanisms for particle production in nuclear collisions. All considered models describe the data reasonably well within 15%.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 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), Universidade Federal do Rio Grande do Sul (UFRGS), Financiadora de Estudos e Projetos (Finep) and Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP), Brazil; Ministry of Science & Technology of China (MSTC), National Natural Science Foundation of China (NSFC) and Ministry of Education of China (MOEC), China; Ministry of Science and Education, Croatia; Ministry of Education, Youth and Sports of the Czech Republic, Czech Republic; The Danish Council for Independent Research Natural Sciences, the Carlsberg Foundation 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, Wissenschaft, Forschung und Technologie (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; Centro Fermi – Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi and Instituto Nazionale di Fisica Nucleare (INFN), Italy; Institute for Innovative Science and Technology, Nagasaki Institute of Applied Science (IIST), Japan Society for the Promotion of Science (JSPS) KAKENHI and Japanese Ministry of Education, Culture, Sports, Science and Technology (MEXT), 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 Science and Higher Education and National Science Centre, 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 Romanian National Agency for Science, Technology and Innovation, Romania; Joint Institute for Nuclear Research (JINR), Ministry of Education and Science of the Russian Federation and National Research Centre Kurchatov Institute, Russia; Ministry of Education, Science, Research and Sport of the Slovak Republic, Slovakia; National Research Foundation of South Africa, South Africa; Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear (CEADEN), Cubaenergía, Cuba and Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Spain; Swedish Research Council (VR) and Knut & Alice Wallenberg Foundation (KAW), Sweden; European Organization for Nuclear Research, Switzerland; National Science and Technology Development Agency (NSDTA), Suranaree University of Technology (SUT) and Office of the Higher Education Commission under NRU project of Thailand, Thailand; Turkish Atomic Energy Agency (TAEK), 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 Americ

Suppression of Lambda(1520) resonance production in central Pb-Pb collisions at root S-NN=2.76 TeV

The production yield of the (1520) baryon resonance is measured at midrapidity in Pb-Pb collisions at 1asNN = 2.76 TeV with the ALICE detector at the Large Hadron Collider (LHC). The measurement is performed in the (1520) \u2192 pK 12 (and charge conjugate) hadronic decay channel as a function of the transverse momentum (pT) and collision centrality. The ratio of the pT-integrated production of (1520) baryons relative to baryons in central collisions is suppressed by about a factor of 2 with respect to peripheral collisions. This is the first observation of the suppression of a baryonic resonance at the LHC and the first 3\u3c3 evidence of (1520) suppression within a single collision system. The measured (1520)/ ratio in central collisions is smaller than the value predicted by the statistical hadronization model calculations. The shape of the measured pT distribution and the centrality dependence of the suppression are reproduced by the EPOS3 Monte Carlo event generator. The measurement adds further support to the formation of a dense hadronic phase in the final stages of the evolution of the fireball created in heavy-ion collisions, lasting long enough to cause a significant reduction in the observable yield of short-lived resonances

Suppression of Lambda(1520) resonance production in central Pb-Pb collisions at root S-NN=2.76 TeV

The production yield of the Lambda(1520) baryon resonance is measured at midrapidity in Pb-Pb collisions at root S-NN = 2.76 TeV with the ALICE detector at the Large Hadron Collider (LHC). The measurement is performed in the Lambda(1520) -> pK(-) (and charge conjugate) hadronic decay channel as a function of the transverse momentum (p(T)) and collision centrality. The ratio of the P-T-integrated production of Lambda(1520) baryons relative to A baryons in central collisions is suppressed by about a factor of 2 with respect to peripheral collisions. This is the first observation of the suppression of a baryonic resonance at the LHC and the first 3 sigma evidence of Lambda(1520) suppression within a single collision system. The measured Lambda(1520)/Lambda ratio in central collisions is smaller than the value predicted by the statistical hadronization model calculations. The shape of the measured p(T) distribution and the centrality dependence of the suppression are reproduced by the EPOS3 Monte Carlo event generator. The measurement adds further support to the formation of a dense hadronic phase in the final stages of the evolution of the fireball created in heavy-ion collisions, lasting long enough to cause a significant reduction in the observable yield of short-lived resonances

Suppression of Λ(1520) resonance production in central Pb-Pb collisions at s NN =2.76 TeV

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Galvan, C.D.; Ganoti, P.; Garabatos, C.; Garcia-Solis, E.; Garg, K.; Gargiulo, C.; Gasik, P.; Gauger, E.F.; Gay Ducati, M.B.; Germain, M.; Ghosh, J.; Ghosh, P.; Ghosh, S.K.; Gianotti, P.; Giubellino, P.; Giubilato, P.; Glässel, P.; Goméz Coral, D.M.; Gomez Ramirez, A.; Gonzalez, V.; González-Zamora, P.; Gorbunov, S.; Görlich, L.; Gotovac, S.; Grabski, V.; Graczykowski, L.K.; Graham, K.L.; Greiner, L.; Grelli, A.; Grigoras, C.; Grigoriev, V.; Grigoryan, A.*; Grigoryan, S.; Gronefeld, J.M.; Grosa, F.; Grosse-Oetringhaus, J.F.; Grosso, R.; Guernane, R.; Guerzoni, B.; Guittiere, M.; Gulbrandsen, K.; Gunji, T.; Gupta, A.; Gupta, R.; Guzman, I.B.; Haake, R.; Habib, M.K.; Hadjidakis, C.; Hamagaki, H.; Hamar, G.; Hamid, M.; Hamon, J.C.; Hannigan, R.; Haque, M.R.; Harris, J.W.; Harton, A.; Hassan, H.; Hatzifotiadou, D.; Hayashi, S.; Heckel, S.T.; Hellbär, E.; Helstrup, H.; Herghelegiu, A.; Hernandez, E.G.; Herrera Corral, G.; Herrmann, F.; Hetland, K.F.; Hilden, T.E.; Hillemanns, H.; Hills, C.; 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Liu, A.; Ljunggren, H.M.; Llope, W.J.; Lodato, D.F.; Loginov, V.; Loizides, C.; Loncar, P.; Lopez, X.; López Torres, E.; Lowe, A.; Luettig, P.; Luhder, J.R.; Lunardon, M.; Luparello, G.; Lupi, M.; Maevskaya, A.; Mager, M.; Mahmood, S.M.; Maire, A.; Majka, R.D.; Malaev, M.; Malik, Q.W.; Malinina, L.; Mal'Kevich, D.; Malzacher, P.; Mamonov, A.; Manko, V.; Manso, F.; Manzari, V.; Mao, Y.; Marchisone, M.; Mareš, J.; Margagliotti, G.V.; Margotti, A.; Margutti, J.; Marín, A.; Markert, C.; Marquard, M.; Martin, N.A.; Martinengo, P.; Martinez, J.L.; Martínez, M.I.; Martínez García, G.; Martinez Pedreira, M.; Masciocchi, S.; Masera, M.; Masoni, A.; Massacrier, L.; Masson, E.; Mastroserio, A.; Mathis, A.M.; Matuoka, P.F.T.; Matyja, A.; Mayer, C.; Mazzilli, M.; Mazzoni, M.A.; Meddi, F.; Melikyan, Y.; Menchaca-Rocha, A.; Meninno, E.; Mercado Pérez, J.; Meres, M.; Meza, C.S.; Mhlanga, S.; Miake, Y.; Micheletti, L.; Mieskolainen, M.M.; Mihaylov, D.L.; Mikhaylov, K.; Mischke, A.; Mishra, A.N.; Miśkowiec, D.; Mitra, J.; Mitu, C.M.; Mohammadi, N.; Mohanty, A.P.; Mohanty, B.; Khan, M. Mohisin; Moreira De Godoy, D.A.; Moreno, L.A.P.; Moretto, S.; Morreale, A.; Morsch, A.; Muccifora, V.; Mudnic, E.; Mühlheim, D.; Muhuri, S.; Mukherjee, M.; Mulligan, J.D.; Munhoz, M.G.; Münning, K.; Munoz, M.I.A.; Munzer, R.H.; Murakami, H.; Murray, S.; Musa, L.; Musinsky, J.; Myers, C.J.; Myrcha, J.W.; Naik, B.; Nair, R.; Nandi, B.K.; Nania, R.; Nappi, E.; Narayan, A.; Naru, M.U.; Nassirpour, A.F.; Natal Da Luz, H.; Nattrass, C.; Navarro, S.R.; Nayak, K.; Nayak, R.; Nayak, T.K.; Nazarenko, S.; Negrao De Oliveira, R.A.; Nellen, L.; Nesbo, S.V.; Neskovic, G.; Ng, F.; Nicassio, M.; Niedziela, J.; Nielsen, B.S.; Nikolaev, S.; Nikulin, S.; Nikulin, V.; Noferini, F.; Nomokonov, P.; Nooren, G.; Noris, J.C.C.; Norman, J.; Nyanin, A.; Nystrand, J.; Oh, H.; Ohlson, A.; Oleniacz, J.; Oliveira Da Silva, A.C.; Oliver, M.H.; Onderwaater, J.; Oppedisano, C.; Orava, R.; Oravec, M.; Ortiz Velasquez, A.; Oskarsson, A.; Otwinowski, J.; Oyama, K.; Pachmayer, Y.; Pacik, V.; Pagano, D.; Paić, G.; Palni, P.; 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Relative particle yield fluctuations in

First results on $$\hbox {K}/\pi$$, $$\hbox {p}/\pi$$ and K/p fluctuations are obtained with the ALICE detector at the CERN LHC as a function of centrality in $$\text{ Pb--Pb }$$ collisions at $$\sqrt{s_\mathrm{{NN}}} =2.76\hbox { TeV}$$. The observable $$\nu _{\mathrm{dyn}}$$, which is defined in terms of the moments of particle multiplicity distributions, is used to quantify the magnitude of dynamical fluctuations of relative particle yields and also provides insight into the correlation between particle pairs. This study is based on a novel experimental technique, called the Identity Method, which allows one to measure the moments of multiplicity distributions in case of incomplete particle identification. The results for $$\hbox {p}/\pi$$ show a change of sign in $$\nu _{\mathrm{dyn}}$$ from positive to negative towards more peripheral collisions. For central collisions, the results follow the smooth trend of the data at lower energies and $$\nu _{\mathrm{dyn}}$$ exhibits a change in sign for $$\hbox {p}/\pi$$ and K/p

Transverse momentum spectra and nuclear modification factors of charged particles in Xe–Xe collisions at sNN=5.44TeV

Transverse momentum (p T ) spectra of charged particles at mid-pseudorapidity in Xe–Xe collisions at s NN =5.44TeV measured with the ALICE apparatus at the Large Hadron Collider are reported. The kinematic range 0.1510 GeV/c. The centrality dependence of the ratio of the average transverse momentum 〈p T 〉 in Xe–Xe collisions over Pb–Pb collision at s=5.02 TeV is compared to hydrodynamical model calculations

Transverse momentum spectra and nuclear modification factors of charged particles in Xe-Xe collisions at root s(NN)=5.44 TeV

Transverse momentum (pT) spectra of charged particles at mid-pseudorapidity in Xe\u2013Xe collisions at 1asNN = 5.44 TeV measured with the ALICE apparatus at the Large Hadron Collider are reported. The kinematic range 0.15 < pT < 50 GeV/c and |\u3b7| < 0.8 is covered. Results are presented in nine classes of collision centrality in the 0\u201380% range. For comparison, a pp reference at the collision energy of 1as = 5.44 TeV is obtained by interpolating between existing pp measurements at 1as = 5.02 and 7 TeV. The nuclear modification factors in central Xe\u2013Xe collisions and Pb\u2013Pb collisions at a similar center-of- mass energy of 1asNN = 5.02 TeV, and in addition at 2.76 TeV, at analogous ranges of charged particle multiplicity density \u27e8dNch/d\u3b7\u27e9 show a remarkable similarity at pT > 10 GeV/c. The centrality dependence of the ratio of the average transverse momentum \u27e8pT\u27e9 in Xe\u2013Xe collisions over Pb\u2013Pb collision at 1as = 5.02 TeV is compared to hydrodynamical model calculations