Charged-particle pseudorapidity density at mid-rapidity in p-Pb collisions at root S-NN=8.16 TeV

S. Acharya; F Acosta; D. Adamova; S Adhya; A. Adler; J Adolfsson; MM. Aggarwal; G.A. Rinella; Maria Agnello; Z. Ahammed; Shamim Ahmad; S.U. Ahn; A. Akindinov; M. Al-Turany; SN Alam; DSD Albuquerque; D. Aleksandrov; B Alessandro; R. Alfaro Molina; A. Alici; A. Alkin; T. Alt; L. Altenkamper; I. Altsybeev; MN Anaam; C. Andrei; Dimosthenis Andreou; Ian Bearden; Christian Alexander Bourjau; bsm989 bsm989; rtc312 rtc312; Ante Bilandzic; Marek Chojnacki; Katarina Gajdosova; Jens Jørgen Gaardhøje; Børge Svane Nielsen; Lais Ozelin De Lima Pimentel; Freja Thoresen; You Zhou; ALICE Collaboration

doi:10.1140/epjc/s10052-019-6801-9

Charged-particle pseudorapidity density at mid-rapidity in p-Pb collisions at root S-NN=8.16 TeV

S. Acharya, F Acosta, D. Adamova, S Adhya, A. Adler, J Adolfsson, MM. Aggarwal, G.A. Rinella, Maria Agnello, Z. Ahammed, Shamim Ahmad, S.U. Ahn, A. Akindinov, M. Al-Turany, SN Alam, DSD Albuquerque, D. Aleksandrov, B Alessandro, R. Alfaro Molina, A. AliciA. Alkin, T. Alt, L. Altenkamper, I. Altsybeev, MN Anaam, C. Andrei, Dimosthenis Andreou, Ian Bearden, Christian Alexander Bourjau, bsm989 bsm989, rtc312 rtc312, Ante Bilandzic, Marek Chojnacki, Katarina Gajdosova, Jens Jørgen Gaardhøje, Børge Svane Nielsen, Lais Ozelin De Lima Pimentel, Freja Thoresen, You Zhou, ALICE Collaboration

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Abstract

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.

Originalsprog	Engelsk
Artikelnummer	307
Tidsskrift	European Physical Journal C
Vol/bind	79
Udgave nummer	4
Antal sider	17
ISSN	1434-6044
DOI	https://doi.org/10.1140/epjc/s10052-019-6801-9
Status	Udgivet - 1 apr. 2019

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10.1140/epjc/s10052-019-6801-9Licens: CC BY

Acharya2019_Article_Charged-particlePseudorapidityForlagets udgivne version, 1,26 MBLicens: CC BY

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Acharya, S., Acosta, F., Adamova, D., Adhya, S., Adler, A., Adolfsson, J., Aggarwal, MM., Rinella, G. A., Agnello, M., Ahammed, Z., Ahmad, S., Ahn, S. U., Akindinov, A., Al-Turany, M., Alam, SN., Albuquerque, DSD., Aleksandrov, D., Alessandro, B., Alfaro Molina, R., ... ALICE Collaboration (2019). Charged-particle pseudorapidity density at mid-rapidity in p-Pb collisions at root S-NN=8.16 TeV. European Physical Journal C, 79(4), Artikel 307. https://doi.org/10.1140/epjc/s10052-019-6801-9

Acharya, S, Acosta, F, Adamova, D, Adhya, S, Adler, A, Adolfsson, J, Aggarwal, MM, Rinella, GA, Agnello, M, Ahammed, Z, Ahmad, S, Ahn, SU, Akindinov, A, Al-Turany, M, Alam, SN, Albuquerque, DSD, Aleksandrov, D, Alessandro, B, Alfaro Molina, R, Alici, A, Alkin, A, Alt, T, Altenkamper, L, Altsybeev, I, Anaam, MN, Andrei, C, Andreou, D, Bearden, I, Bourjau, CA, bsm989, B , rtc312, R, Bilandzic, A, Chojnacki, M, Gajdosova, K, Gaardhøje, JJ , Nielsen, BS, Ozelin De Lima Pimentel, L, Thoresen, F, Zhou, Y & ALICE Collaboration 2019, 'Charged-particle pseudorapidity density at mid-rapidity in p-Pb collisions at root S-NN=8.16 TeV', European Physical Journal C, bind 79, nr. 4, 307. https://doi.org/10.1140/epjc/s10052-019-6801-9

@article{eea6a6209b1744fa8623ca320b83ca99,

title = "Charged-particle pseudorapidity density at mid-rapidity in p-Pb collisions at root S-NN=8.16 TeV",

abstract = " 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. ",

author = "S. Acharya and F Acosta and D. Adamova and S Adhya and A. Adler and J Adolfsson and MM. Aggarwal and G.A. Rinella and Maria Agnello and Z. Ahammed and Shamim Ahmad and S.U. Ahn and A. Akindinov and M. Al-Turany and SN Alam and DSD Albuquerque and D. Aleksandrov and B Alessandro and {Alfaro Molina}, R. and A. Alici and A. Alkin and T. Alt and L. Altenkamper and I. Altsybeev and MN Anaam and C. Andrei and Dimosthenis Andreou and Ian Bearden and Bourjau, {Christian Alexander} and bsm989 bsm989 and rtc312 rtc312 and Ante Bilandzic and Marek Chojnacki and Katarina Gajdosova and Gaardh{\o}je, {Jens J{\o}rgen} and Nielsen, {B{\o}rge Svane} and {Ozelin De Lima Pimentel}, Lais and Freja Thoresen and You Zhou and {ALICE Collaboration}",

year = "2019",

month = apr,

day = "1",

doi = "10.1140/epjc/s10052-019-6801-9",

language = "English",

volume = "79",

journal = "European Physical Journal C",

issn = "1434-6044",

publisher = "Springer",

number = "4",

}

TY - JOUR

T1 - Charged-particle pseudorapidity density at mid-rapidity in p-Pb collisions at root S-NN=8.16 TeV

AU - Acharya, S.

AU - Acosta, F

AU - Adamova, D.

AU - Adhya, S

AU - Adler, A.

AU - Adolfsson, J

AU - Aggarwal, MM.

AU - Rinella, G.A.

AU - Agnello, Maria

AU - Ahammed, Z.

AU - Ahmad, Shamim

AU - Ahn, S.U.

AU - Akindinov, A.

AU - Al-Turany, M.

AU - Alam, SN

AU - Albuquerque, DSD

AU - Aleksandrov, D.

AU - Alessandro, B

AU - Alfaro Molina, R.

AU - Alici, A.

AU - Alkin, A.

AU - Alt, T.

AU - Altenkamper, L.

AU - Altsybeev, I.

AU - Anaam, MN

AU - Andrei, C.

AU - Andreou, Dimosthenis

AU - Bearden, Ian

AU - Bourjau, Christian Alexander

AU - bsm989, bsm989

AU - rtc312, rtc312

AU - Bilandzic, Ante

AU - Chojnacki, Marek

AU - Gajdosova, Katarina

AU - Gaardhøje, Jens Jørgen

AU - Nielsen, Børge Svane

AU - Ozelin De Lima Pimentel, Lais

AU - Thoresen, Freja

AU - Zhou, You

AU - ALICE Collaboration

PY - 2019/4/1

Y1 - 2019/4/1

N2 - 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.

AB - 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.

U2 - 10.1140/epjc/s10052-019-6801-9

DO - 10.1140/epjc/s10052-019-6801-9

M3 - Journal article

SN - 1434-6044

VL - 79

JO - European Physical Journal C

JF - European Physical Journal C

IS - 4

M1 - 307

ER -

Charged-particle pseudorapidity density at mid-rapidity in p-Pb collisions at root S-NN=8.16 TeV

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