Charged-particle pseudorapidity density at mid-rapidity in p–Pb collisions at $$\pmb {\sqrt{s_{\scriptscriptstyle {\mathrm{NN}}}}}$$ s NN = 8.16 TeV
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Charged-particle pseudorapidity density at mid-rapidity in p–Pb collisions at $$\pmb {\sqrt{s_{\scriptscriptstyle {\mathrm{NN}}}}}$$ s NN = 8.16 TeV

  • Author(s): Acharya, S
  • Acosta, F-T
  • Adamová, D
  • Adhya, SP
  • Adler, A
  • Adolfsson, J
  • Aggarwal, MM
  • Rinella, G Aglieri
  • Agnello, M
  • Ahammed, Z
  • Ahmad, S
  • Ahn, SU
  • Aiola, S
  • Akindinov, A
  • Al-Turany, M
  • Alam, SN
  • Albuquerque, DSD
  • Aleksandrov, D
  • Alessandro, B
  • Alfanda, HM
  • Molina, R Alfaro
  • Ali, Y
  • Alici, A
  • Alkin, A
  • Alme, J
  • Alt, T
  • Altenkamper, L
  • Altsybeev, I
  • Anaam, MN
  • Andrei, C
  • Andreou, D
  • Andrews, HA
  • Andronic, A
  • Angeletti, M
  • Anguelov, V
  • Anson, C
  • Antičić, T
  • Antinori, F
  • Antonioli, P
  • Anwar, R
  • Apadula, N
  • Aphecetche, L
  • Appelshäuser, H
  • Arcelli, S
  • Arnaldi, R
  • Arratia, M
  • Arsene, IC
  • Arslandok, M
  • Augustinus, A
  • Averbeck, R
  • Azmi, MD
  • Badalà, A
  • Baek, YW
  • Bagnasco, S
  • Bailhache, R
  • Bala, R
  • Baldisseri, A
  • Ball, M
  • Baral, RC
  • Barbera, R
  • Barioglio, L
  • Barnaföldi, GG
  • Barnby, LS
  • Barret, V
  • Bartalini, P
  • Barth, K
  • Bartsch, E
  • Bastid, N
  • Basu, S
  • Batigne, G
  • Batyunya, B
  • Batzing, PC
  • Bauri, D
  • Bazo Alba, JL
  • Bearden, IG
  • Beck, H
  • Bedda, C
  • Behera, NK
  • Belikov, I
  • Bellini, F
  • Martinez, H Bello
  • Bellwied, R
  • Beltran, LGE
  • Belyaev, V
  • Bencedi, G
  • Beole, S
  • Bercuci, A
  • Berdnikov, Y
  • Berenyi, D
  • Bertens, RA
  • Berzano, D
  • Betev, L
  • Bhasin, A
  • Bhat, IR
  • Bhatt, H
  • Bhattacharjee, B
  • Bianchi, A
  • Bianchi, L
  • Bianchi, N
  • Bielčík, J
  • Bielčíková, J
  • Bilandzic, A
  • Biro, G
  • Biswas, R
  • Biswas, S
  • Blair, JT
  • Blau, D
  • Blume, C
  • Boca, G
  • Bock, F
  • Bogdanov, A
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  • Bolozdynya, A
  • Bombara, M
  • Bonomi, G
  • Bonora, M
  • Borel, H
  • Borissov, A
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  • Bruno, GE
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Published Web Location

https://doi.org/10.1140/epjc/s10052-019-6801-9
No data is associated with this publication.
Abstract

© 2019, CERN for the benefit of the ALICE collaboration. The pseudorapidity density of charged particles, d N ch / d η, in p–Pb collisions has been measured at a centre-of-mass energy per nucleon–nucleon pair of sNN = 8.16 TeV at mid-pseudorapidity for non-single-diffractive events. The results cover 3.6 units of pseudorapidity, | η| < 1.8. The d N ch / d η value is 19.1 ± 0.7 at | η| < 0.5. This quantity divided by ⟨ N part ⟩ / 2 is 4.73 ± 0.20 , where ⟨ N part ⟩ is the average number of participating nucleons, is 9.5% higher than the corresponding value for p–Pb collisions at sNN = 5.02 TeV. Measurements are compared with models based on different mechanisms for particle production. All models agree within uncertainties with data in the Pb-going side, while HIJING overestimates, showing a symmetric behaviour, and EPOS underestimates the p-going side of the d N ch / d η distribution. Saturation-based models reproduce the distributions well for η> - 1.3. The d N ch / d η is also measured for different centrality estimators, based both on the charged-particle multiplicity and on the energy deposited in the Zero-Degree Calorimeters. A study of the implications of the large multiplicity fluctuations due to the small number of participants for systems like p–Pb in the centrality calculation for multiplicity-based estimators is discussed, demonstrating the advantages of determining the centrality with energy deposited near beam rapidity.

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