Charged-particle pseudorapidity density at mid-rapidity in p–Pb collisions at √sNN = 8.16 TeV
- Acharya, S;
- Acosta, FT;
- Adamová, D;
- Adhya, SP;
- Adler, A;
- Adolfsson, J;
- Aggarwal, MM;
- Rinella, GA;
- 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, RA;
- 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, HB;
- 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
- et al.
Published Web Location
https://doi.org/10.1140/epjc/s10052-019-6801-9Abstract
The pseudorapidity density of charged particles, d Nch/ 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 Nch/ d η value is 19.1 ± 0.7 at | η| < 0.5. This quantity divided by ⟨ Npart⟩ / 2 is 4.73 ± 0.20 , where ⟨ Npart⟩ 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 Nch/ d η distribution. Saturation-based models reproduce the distributions well for η> - 1.3. The d Nch/ 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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