Pion, Kaon, and Proton Production in Central Pb-Pb Collisions at root s(NN)=2.76 TeV

Abelev, B.; Adam, J.; Adamova, D.; Adare, A. M.; Aggarwal, M. M.; Rinella, G. Aglieri; Agocs, A. G.; Agostinelli, A.; Aguilar Salazar, S.; Ahammed, Z.; Ahmad, N.; Masoodi, A. Ahmad; Ahn, S. A.; Ahn, S. U.; Akindinov, A.; Aleksandrov, D.; Alessandro, B.; Alfaro Molina, R.; Alici, A.; Alkin, A.; Almaraz Avina, E.; Alme, J.; Alt, T.; Altini, V.; Altinpinar, S.; Altsybeev, I.; Andrei, C.; Andronic, A.; Anguelov, V.; Anielski, J.; Anson, C.; Anticic, T.; Antinori, F.; Antonioli, P.; Aphecetche, L.; Appelshaeuser, H.; Arbor, N.; Arcelli, S.; Arend, A.; Armesto, N.; Arnaldi, R.; Aronsson, T.; Arsene, I. C.; Arslandok, M.; Asryan, A.; Augustinus, A.; Averbeck, R.; Awes, T. C.; Aysto, J.; Azmi, M. D.

Pion, Kaon, and Proton Production in Central Pb-Pb Collisions at root s(NN)=2.76 TeV

Mark

Abelev, B. ; Adam, J. ; Adamova, D. ; Adare, A. M. ; Aggarwal, M. M. ; Rinella, G. Aglieri ; Agocs, A. G. ; Agostinelli, A. ; Aguilar Salazar, S. and Ahammed, Z. , et al. (2012) In Physical Review Letters 109(25).

Abstract: In this Letter we report the first results on pi(+/-), K-+/-, p, and (p) over bar production at midrapidity (vertical bar y vertical bar < 0.5) in central Pb-Pb collisions at root s(NN) = 2.76 TeV, measured by the ALICE experiment at the LHC. The p(T) distributions and yields are compared to previous results at root s(NN) = 200 GeV and expectations from hydrodynamic and thermal models. The spectral shapes indicate a strong increase of the radial flow velocity with root s(NN), which in hydrodynamic models is expected as a consequence of the increasing particle density. While the K/pi ratio is in line with predictions from the thermal model, the p/pi ratio is found to be lower by a factor of about 1.5. This deviation from thermal model... (More); In this Letter we report the first results on pi(+/-), K-+/-, p, and (p) over bar production at midrapidity (vertical bar y vertical bar < 0.5) in central Pb-Pb collisions at root s(NN) = 2.76 TeV, measured by the ALICE experiment at the LHC. The p(T) distributions and yields are compared to previous results at root s(NN) = 200 GeV and expectations from hydrodynamic and thermal models. The spectral shapes indicate a strong increase of the radial flow velocity with root s(NN), which in hydrodynamic models is expected as a consequence of the increasing particle density. While the K/pi ratio is in line with predictions from the thermal model, the p/pi ratio is found to be lower by a factor of about 1.5. This deviation from thermal model expectations is still to be understood. (Less)

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author

Abelev, B. ; Adam, J. ; Adamova, D. ; Adare, A. M. ; Aggarwal, M. M. ; Rinella, G. Aglieri ; Agocs, A. G. ; Agostinelli, A. ; Aguilar Salazar, S. and Ahammed, Z. , et al. (More)

Abelev, B. ; Adam, J. ; Adamova, D. ; Adare, A. M. ; Aggarwal, M. M. ; Rinella, G. Aglieri ; Agocs, A. G. ; Agostinelli, A. ; Aguilar Salazar, S. ; Ahammed, Z. ; Ahmad, N. ; Masoodi, A. Ahmad ; Ahn, S. A. ; Ahn, S. U. ; Akindinov, A. ; Aleksandrov, D. ; Alessandro, B. ; Alfaro Molina, R. ; Alici, A. ; Alkin, A. ; Almaraz Avina, E. ; Alme, J. ; Alt, T. ; Altini, V. ; Altinpinar, S. ; Altsybeev, I. ; Andrei, C. ; Andronic, A. ; Anguelov, V. ; Anielski, J. ; Anson, C. ; Anticic, T. ; Antinori, F. ; Antonioli, P. ; Aphecetche, L. ; Appelshaeuser, H. ; Arbor, N. ; Arcelli, S. ; Arend, A. ; Armesto, N. ; Arnaldi, R. ; Aronsson, T. ; Arsene, I. C. ; Arslandok, M. ; Asryan, A. ; Augustinus, A. ; Averbeck, R. ; Awes, T. C. ; Aysto, J. ; Azmi, M. D. ; Bach, M. ; Badala, A. ; Baek, Y. W. ; Bailhache, R. ; Bala, R. ; Ferroli, R. Baldini ; Baldisseri, A. ; Baldit, A. ; Pedrosa, F. Baltasar Dos Santos ; Ban, J. ; Baral, R. C. ; Barbera, R. ; Barile, F. ; Barnafoeldi, G. G. ; Barnby, L. 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organization

Particle and nuclear physics

publishing date

2012

type

Contribution to journal

publication status

published

subject

Subatomic Physics

in

Physical Review Letters

volume

109

issue

25

article number

252301

publisher

American Physical Society

external identifiers

wos:000312451600005
scopus:84871264849
pmid:23368453

ISSN

1079-7114

DOI

10.1103/PhysRevLett.109.252301

language

English

LU publication?

yes

id

d3d1ca99-457c-4bf3-9937-a8978ac00231 (old id 3365171)

date added to LUP

2016-04-01 10:11:24

date last changed

2023-01-02 02:02:34

@article{d3d1ca99-457c-4bf3-9937-a8978ac00231,
  abstract     = {{In this Letter we report the first results on pi(+/-), K-+/-, p, and (p) over bar production at midrapidity (vertical bar y vertical bar &lt; 0.5) in central Pb-Pb collisions at root s(NN) = 2.76 TeV, measured by the ALICE experiment at the LHC. The p(T) distributions and yields are compared to previous results at root s(NN) = 200 GeV and expectations from hydrodynamic and thermal models. The spectral shapes indicate a strong increase of the radial flow velocity with root s(NN), which in hydrodynamic models is expected as a consequence of the increasing particle density. While the K/pi ratio is in line with predictions from the thermal model, the p/pi ratio is found to be lower by a factor of about 1.5. This deviation from thermal model expectations is still to be understood.}},
  author       = {{Abelev, B. and Adam, J. and Adamova, D. and Adare, A. M. and Aggarwal, M. M. and Rinella, G. Aglieri and Agocs, A. G. and Agostinelli, A. and Aguilar Salazar, S. and Ahammed, Z. and Ahmad, N. and Masoodi, A. Ahmad and Ahn, S. A. and Ahn, S. U. and Akindinov, A. and Aleksandrov, D. and Alessandro, B. and Alfaro Molina, R. and Alici, A. and Alkin, A. and Almaraz 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 Aysto, J. and Azmi, M. D. and Bach, M. and Badala, A. and Baek, Y. W. and Bailhache, R. and Bala, R. and Ferroli, R. Baldini and Baldisseri, A. and Baldit, A. and Pedrosa, F. Baltasar Dos Santos and Ban, J. and Baral, R. C. and Barbera, R. and Barile, F. and Barnafoeldi, G. 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 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 Berzano, D. and Betev, L. and Bhasin, A. and Bhati, A. 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  issn         = {{1079-7114}},
  language     = {{eng}},
  number       = {{25}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review Letters}},
  title        = {{Pion, Kaon, and Proton Production in Central Pb-Pb Collisions at root s(NN)=2.76 TeV}},
  url          = {{http://dx.doi.org/10.1103/PhysRevLett.109.252301}},
  doi          = {{10.1103/PhysRevLett.109.252301}},
  volume       = {{109}},
  year         = {{2012}},
}

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Pion, Kaon, and Proton Production in Central Pb-Pb Collisions at root s(NN)=2.76 TeV