Article open access publication

Multiplicity dependence of (anti-)deuteron production in pp collisions at s = 7 TeV

Physics Letters B, Elsevier, ISSN 1873-2445

Volume 794, 2019

DOI:10.1016/j.physletb.2019.05.028, Dimensions: pub.1115218802,

Authors

Adler, A. (4)
Ahmad, S. (9)
Ahn, S.U. (10)
Aiola, S. (11)
Ali, B. (9)
Ali, Y. (18)
Alici, A. (19) (20) (21)
Alkin, A. (22)
Alme, J. (23)
Alt, T. (4)
Andrei, C. (25)
Andronic, A. (13) (27)
Anson, C. (29)
Anwar, R. (32)
Baek, Y.W. (37) (38)
Bala, R. (39)
Ball, M. (41)
Barret, V. (45)
Barth, K. (7)
Bastid, N. (45)
Basu, S. (46)
Bauri, D. (48)
Bedda, C. (51)
Beole, S. (8)
Betev, L. (7)
Bhasin, A. (39)
Bhat, I.R. (39)
Bhatt, H. (48)
Bianchi, L. (8) (32)
Biro, G. (43)
Biswas, R. (62)
Biswas, S. (62)
Blau, D. (15)
Blume, C. (4)
Boca, G. (64)
Bock, F. (7)
Bonomi, G. (66)
Borel, H. (40)
Borissov, A. (27) (28)
Borri, M. (67)
Botta, E. (8)
Broz, M. (60)
Bruna, E. (8)
Buhler, P. (72)
Busch, O. (73)
Butt, J.B. (18)
Caines, H. (11)
Caliva, A. (13)
Carnesecchi, F. (19) (21)
Chang, B. (80)
Chang, W. (16)
Cho, S. (38)
Chujo, T. (73)
Cicalo, C. (78)
Cifarelli, L. (19) (21)
Collu, A. (33)
Contin, G. (67)
Costa, F. (7)
Dahms, T. (61)
Damas, F.P.A. (34) (40)
Dani, S. (91)
Danu, A. (92)
Das, D. (81)
Das, I. (81)
Das, S. (62)
Dash, A. (42)
Dash, S. (48)
Dashi, A. (61)
De, S. (42) (93)
De, A. (94)
De Gruttola, D. (19) (94)
Deisting, A. (13) (28)
Deloff, A. (95)
Diaz, R.A. (96)
Dietel, T. (84)
Ding, Y. (16)
Dordic, O. (35)
Dubla, A. (13)
Dudi, S. (6)
Elia, D. (79)
Engel, H. (4)
Epple, E. (11)
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Evans, D. (26)
Faggin, M. (99)
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Manko, V. (15)
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Marín, A. (13)
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Musinsky, J. (113)
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Nania, R. (19) (20)
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Nayak, T.K. (1) (42)
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Papikyan, V. (106)
Pareek, P. (93)
Park, J. (38)
Paul, B. (8)
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Pezzi, R.P. (104)
Piano, S. (77)
Pikna, M. (125)
Pillot, P. (34)
Pinazza, O. (7) (20)
Pinsky, L. (32)
Pisano, S. (59)
Pluta, J. (90)
Poljak, N. (97)
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Prino, F. (8)
Punin, V. (71)
Ragoni, S. (26)
Raha, S. (62)
Rajput, S. (39)
Rak, J. (80)
Rami, F. (52)
Raniwala, R. (127)
Raniwala, S. (127)
Rath, R. (93)
Ratza, V. (41)
Read, K.F. (57) (87)
Rehman, A. (23)
Reidt, F. (7)
Ren, X. (16)
Reshetin, A. (101)
Riabov, V. (56)
Richert, T. (5) (50)
Riggi, F. (36)
Ristea, C. (92)
Rode, S.P. (93)
Røed, K. (35)
Rohr, D. (7)
Roslon, K. (90)
Rosnet, P. (45)
Rossi, A. (31) (99)
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Rui, R. (77)
Rustamov, A. (128)
Ryabov, Y. (56)
Rybicki, A. (100)
Sadhu, S. (1)
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Sahoo, B. (48)
Sahoo, P. (93)
Sahoo, R. (93)
Sahoo, S. (91)
Sahu, P.K. (91)
Saini, J. (1)
Sakai, S. (73)
Samsonov, V. (55) (56)
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Schmah, A. (28)
Schmidt, M. (129)
Schmidt, N.V. (4) (87)
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  1. (1) Variable Energy Cyclotron Centre, grid.482273.8
  2. (2) University of California, Berkeley, grid.47840.3f
  3. (3) Nuclear Physics Institute of the Czech Academy of Sciences, Řež u Prahy, Czech Republic
  4. (4) Goethe University Frankfurt, grid.7839.5
  5. (5) Lund University, grid.4514.4
  6. (6) Panjab University, grid.261674.0
  7. (7) European Organization for Nuclear Research, grid.9132.9
  8. (8) INFN Sezione di Torino, grid.470222.1
  9. (9) Aligarh Muslim University, grid.411340.3
  10. (10) Korea Institute of Science & Technology Information, grid.249964.4
  11. (11) Yale University, grid.47100.32
  12. (12) Institute for Theoretical and Experimental Physics, grid.21626.31
  13. (13) GSI Helmholtz Centre for Heavy Ion Research, grid.159791.2
  14. (14) State University of Campinas, grid.411087.b
  15. (15) Kurchatov Institute, grid.18919.38
  16. (16) Central China Normal University, grid.411407.7
  17. (17) National Autonomous University of Mexico, grid.9486.3
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  21. (21) Dipartimento di Fisica e Astronomia dell'Università and Sezione INFN, Bologna, Italy
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  128. (128) National Nuclear Research Center, Baku, Azerbaijan
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  130. (130) Hiroshima University, grid.257022.0
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  133. (133) Indonesian Institute of Sciences, grid.249566.a
  134. (134) Centre de Calcul de l'IN2P3, Villeurbanne, Lyon, France
  135. (135) University of the Witwatersrand, grid.11951.3d
  136. (136) University of Science and Technology of China, grid.59053.3a

Description

In this letter, the production of deuterons and anti-deuterons in pp collisions at s = 7 TeV is studied as a function of the charged-particle multiplicity density at mid-rapidity with the ALICE detector at the LHC. Production yields are measured at mid-rapidity in five multiplicity classes and as a function of the deuteron transverse momentum ( p T ). The measurements are discussed in the context of hadron–coalescence models. The coalescence parameter B 2 , extracted from the measured spectra of (anti-)deuterons and primary (anti-)protons, exhibits no significant p T -dependence for p T < 3 GeV / c , in agreement with the expectations of a simple coalescence picture. At fixed transverse momentum per nucleon, the B 2 parameter is found to decrease smoothly from low multiplicity pp to Pb–Pb collisions, in qualitative agreement with more elaborate coalescence models. The measured mean transverse momentum of (anti-)deuterons in pp is not reproduced by the Blast-Wave model calculations that simultaneously describe pion, kaon and proton spectra, in contrast to central Pb–Pb collisions. The ratio between the p T -integrated yield of deuterons to protons, d/p, is found to increase with the charged-particle multiplicity, as observed in inelastic pp collisions at different centre-of-mass energies. The d/p ratios are reported in a wide range, from the lowest to the highest multiplicity values measured in pp collisions at the LHC.

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