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Mid-rapidity anti-baryon to baryon ratios in pp collisions at root s=0.9, 2.76 and 7 TeV measured by ALICE

Abbas, E. ; Abelev, B. ; Adam, J. ; Adamova, D. ; Adare, A. M. ; Aggarwal, M. M. ; Rinella, G. Aglieri ; Agnello, M. ; Agocs, A. G. and Agostinelli, A. , et al. (2013) In European Physical Journal C. Particles and Fields 73(7).
Abstract
The ratios of yields of anti-baryons to baryons probes the mechanisms of baryon-number transport. Results for (p) over bar /p, (Lambda) over bar/Lambda, (Xi) over bar (+)/(Xi) over bar (-) and (Omega) over bar (+)/(Omega) over bar (-) in pp collisions at root s = 0.9, 2.76 and 7 TeV, measured with the ALICE detector at the LHC, are reported. Within the experimental uncertainties and ranges covered by our measurement, these ratios are independent of rapidity, transverse momentum and multiplicity for all measured energies. The results are compared to expectations from event generators, such as PYTHIA and HIJING/B, that are used to model the particle production in pp collisions. The energy dependence of (p) over bar /p, (Lambda) over... (More)
The ratios of yields of anti-baryons to baryons probes the mechanisms of baryon-number transport. Results for (p) over bar /p, (Lambda) over bar/Lambda, (Xi) over bar (+)/(Xi) over bar (-) and (Omega) over bar (+)/(Omega) over bar (-) in pp collisions at root s = 0.9, 2.76 and 7 TeV, measured with the ALICE detector at the LHC, are reported. Within the experimental uncertainties and ranges covered by our measurement, these ratios are independent of rapidity, transverse momentum and multiplicity for all measured energies. The results are compared to expectations from event generators, such as PYTHIA and HIJING/B, that are used to model the particle production in pp collisions. The energy dependence of (p) over bar /p, (Lambda) over bar/(Lambda) over bar, (Xi) over bar (+)/(Xi) over bar (-) and (Omega) over bar (+)/(Omega) over bar (-), reaching values compatible with unity for root s = 7 TeV, complement the earlier (p) over bar /p measurement of ALICE. These dependencies can be described by exchanges with the Regge-trajectory intercept of alpha(J) approximate to 0.5, which are suppressed with increasing rapidity interval Delta y. Any significant contribution of an exchange not suppressed at large Delta y (reached at LHC energies) is disfavoured. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
European Physical Journal C. Particles and Fields
volume
73
issue
7
article number
2496
publisher
Springer
external identifiers
  • wos:000322575300021
  • scopus:84881583295
ISSN
1434-6044
DOI
10.1140/epjc/s10052-013-2496-5
language
English
LU publication?
yes
id
6661e7f9-1428-41c0-9e24-0bc812bd3120 (old id 4025963)
date added to LUP
2016-04-01 12:51:26
date last changed
2023-01-03 19:36:36
@article{6661e7f9-1428-41c0-9e24-0bc812bd3120,
  abstract     = {{The ratios of yields of anti-baryons to baryons probes the mechanisms of baryon-number transport. Results for (p) over bar /p, (Lambda) over bar/Lambda, (Xi) over bar (+)/(Xi) over bar (-) and (Omega) over bar (+)/(Omega) over bar (-) in pp collisions at root s = 0.9, 2.76 and 7 TeV, measured with the ALICE detector at the LHC, are reported. Within the experimental uncertainties and ranges covered by our measurement, these ratios are independent of rapidity, transverse momentum and multiplicity for all measured energies. The results are compared to expectations from event generators, such as PYTHIA and HIJING/B, that are used to model the particle production in pp collisions. The energy dependence of (p) over bar /p, (Lambda) over bar/(Lambda) over bar, (Xi) over bar (+)/(Xi) over bar (-) and (Omega) over bar (+)/(Omega) over bar (-), reaching values compatible with unity for root s = 7 TeV, complement the earlier (p) over bar /p measurement of ALICE. These dependencies can be described by exchanges with the Regge-trajectory intercept of alpha(J) approximate to 0.5, which are suppressed with increasing rapidity interval Delta y. Any significant contribution of an exchange not suppressed at large Delta y (reached at LHC energies) is disfavoured.}},
  author       = {{Abbas, E. and Abelev, B. and Adam, J. and Adamova, D. and Adare, A. M. and Aggarwal, M. M. and Rinella, G. Aglieri and Agnello, M. and Agocs, A. G. and Agostinelli, A. and Ahammed, Z. and Ahmad, N. and Masoodi, A. Ahmad and Ahmed, I. and Ahn, S. A. and Ahn, S. U. and Aimo, I. and Ajaz, M. and Akindinov, A. and Aleksandrov, D. and Alessandro, B. and Alici, A. and Alkin, A. and Almarz Avina, E. and Alme, J. and Alt, T. and Altini, V. and Altinpinar, S. and Altsybeev, I. and Andrei, C. and Andronic, A. and Anguelov, V. and Anielski, J. and Anson, C. and Anticic, T. and Antinori, F. and Antonioli, P. and Aphecetche, L. and Appelshaeuser, H. and Arbor, N. and Arcelli, S. and Arend, A. and Armesto, N. and Arnaldi, R. and Aronsson, T. and Arsene, I. C. and Arslandok, M. and Asryan, A. and Augustinus, A. and Averbeck, R. and Awes, T. C. and Aeystoe, J. and Azmi, M. D. and Bach, M. and Badala, A. and Baek, Y. W. and Bailhache, R. and Bala, R. and Baldisseri, A. and Pedrosa, F. Baltasar Dos Santos and Ban, J. and Baral, R. C. and Barbera, R. and Barile, F. and Barnafoeldi, G. and Barnby, L. S. and Barret, V. and Bartke, J. and Basile, M. and Bastid, N. and Basu, S. and Bathen, B. and Batigne, G. and Batyunya, B. and Batzing, P. C. and Baumann, C. and Bearden, I. G. and Beck, H. and Behera, N. K. and Belikov, I. and Bellini, F. and Bellwied, R. and Belmont-Moreno, E. and Bencedi, G. and Beole, S. and Berceanu, I. and Bercuci, A. and Berdnikov, Y. and Berenyi, D. and Bergognon, A. A. E. and Bertens, R. A. and Berzano, D. and Betev, L. and Bhasin, A. and Bhati, A. K. and Bhom, J. and Bianchi, N. and Bianchi, L. and Bianchin, C. and Bielcik, J. and Bielcikova, J. and Bilandzic, A. and Bjelogrlic, S. and Blanco, F. and Blanco, F. and Blau, D. and Blume, C. and Boccioli, M. and Boettger, S. and Bogdanov, A. and Boggild, H. and Bogolyubsky, M. and Boldizsar, L. and Bombara, M. and Book, J. and Borel, H. and Borissov, A. and Bossu, F. and Botje, M. and Botta, E. and Braidot, E. and Braun-Munzinger, P. and Bregant, M. and Breitner, T. and Broker, T. A. and Browning, T. A. and Broz, M. and Brun, R. and Bruna, E. and Bruno, G. E. and Budnikov, D. and Buesching, H. and Bufalino, S. and Buncic, P. and Busch, O. and Buthelezi, Z. and Caffarri, D. and Cai, X. and Caines, H. and Villar, E. Calvo and Camerini, P. and Roman, V. Canoa and Romeo, G. Cara and Carena, F. and Carena, W. and Filho, N. Carlin and Carminati, F. and Diaz, A. Casanova and Castellanos, J. Castillo and Hernandez, J. F. Castillo and Casula, E. A. R. and Catanescu, V. and Cavicchioli, C. and Sanchez, C. Ceballos and Cepila, J. and Cerello, P. and Chang, B. and Chapeland, S. and Charvet, J. L. and Chattopadhyay, S. and Chattopadhyay, S. and Cherney, M. and Cheshkov, C. and Cheynis, B. and Barroso, V. Chibante and Chinellato, D. D. and Chochula, P. and Chojnacki, M. and Choudhury, S. and Christakoglou, P. and Christensen, C. H. and Christiansen, Peter and Chujo, T. and Chung, S. U. and Cicalo, C. and Cifarelli, L. and Cindolo, F. and Cleymans, J. and Colamaria, F. and Colella, D. and Collu, A. and Balbastre, G. Conesa and del Valle, Z. Conesa and Connors, M. E. and Contin, G. and Contreras, J. G. and Cormier, T. M. and Morales, Y. Corrales and Cortese, P. and Cortes Maldonado, I. and Cosentino, M. R. and Costa, F. and Cotallo, M. 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A. and Hetland, K. F. and Hicks, B. and Hippolyte, B. and Hori, Y. and Hristov, P. and Hrivnacova, I. and Huang, M. and Humanic, T. J. and Hwang, D. S. and Ichou, R. and Ilkaev, R. and Ilkiv, I. and Inaba, M. and Incani, E. and Innocenti, P. G. and Innocenti, G. M. and Ippolitov, M. and Irfan, M. and Ivan, C. and Ivanov, M. and Ivanov, A. and Ivanov, V. and Ivanytskyi, O. and Jacholkowski, A. and Jacobs, P. M. and Jahnke, C. and Jang, H. J. and Janik, M. A. and Jayarathna, P. H. S. Y. and Jena, S. and Jha, D. M. and Bustamante, R. T. Jimenez and Jones, P. G. and Jung, H. and Jusko, A. and Kaidalov, A. B. and Kalcher, S. and Kalinak, P. and Kalliokoski, T. and Kalweit, A. and Kang, J. H. and Kaplin, V. and Kar, S. and Uysal, A. Karasu and Karavichev, O. and Karavicheva, T. and Karpechev, E. and Kazantsev, A. and Kebschull, U. and Keidel, R. and Ketzer, B. and Khan, P. and Khan, K. H. and Khan, S. A. and Khan, M. M. and Khanzadeev, A. and Kharlov, Y. and Kileng, B. and Kim, D. 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  issn         = {{1434-6044}},
  language     = {{eng}},
  number       = {{7}},
  publisher    = {{Springer}},
  series       = {{European Physical Journal C. Particles and Fields}},
  title        = {{Mid-rapidity anti-baryon to baryon ratios in pp collisions at root s=0.9, 2.76 and 7 TeV measured by ALICE}},
  url          = {{http://dx.doi.org/10.1140/epjc/s10052-013-2496-5}},
  doi          = {{10.1140/epjc/s10052-013-2496-5}},
  volume       = {{73}},
  year         = {{2013}},
}