Article Dans Une Revue European Physical Journal C: Particles and Fields Année : 2015

Nuclear effects on the transverse momentum spectra of charged particles in pPb collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV

V. Khachatryan , M. Besancon (1) , F. Couderc (1) , M. Dejardin (1) , D. Denegri (1) , B. Fabbro (1) , J.L. Faure (1) , C. Favaro (1) , F. Ferri (1) , S. Ganjour (1) , A. Givernaud (1) , P. Gras (1) , G. Hamel De Monchenault (1) , P. Jarry (1) , E. Locci (1) , J. Malcles (1) , J. Rander (1) , A. Rosowsky (1) , M. Titov (1) , S. Baffioni (2) , F. Beaudette (2) , P. Busson (2) , C. Charlot (2) , T. Dahms (2) , M. Dalchenko (2) , L. Dobrzynski (2) , N. Filipovic (2) , A. Florent (2) , R. Granier de Cassagnac (2) , L. Mastrolorenzo (2) , P. Mine (2) , C. Mironov (2) , I.N. Naranjo (2) , M. Nguyen (2) , C. Ochando (2) , P. Paganini (2) , S. Regnard (2) , R. Salerno (2) , J.B. Sauvan (2) , Y. Sirois (2) , C. Veelken (2) , Y. Yilmaz (2) , A. Zabi (2) , J.-L. Agram (3) , J. Andrea (3) , A. Aubin (3) , D. Bloch (3) , J.-M. Brom (3) , E.C. Chabert (3) , C. Collard (3) , E. Conte (3) , J.-C. Fontaine (3) , D. Gele (3) , U. Goerlach (3) , C. Goetzmann (3) , A.-C. Le Bihan (3) , K. Skovpen (3) , P. van Hove (3) , S. Gadrat (4) , S. Beauceron (5) , N. Beaupere (5) , G. Boudoul (5) , E. Bouvier (5) , S. Brochet (5) , C.A. Carrillo Montoya (5) , J. Chasserat (5) , R. Chierici (5) , D. Contardo (5) , P. Depasse (5) , H. El Mamouni (5) , J. Fan (5) , J. Fay (5) , S. Gascon (5) , M. Gouzevitch (5) , B. Ille (5) , T. Kurca (5) , M. Lethuillier (5) , L. Mirabito (5) , S. Perries (5) , J.D. Ruiz Alvarez (5) , D. Sabes (2) , L. Sgandurra (5) , V. Sordini (5) , M. Vander Donckt (5) , P. Verdier (5) , S. Viret (5) , H. Xiao (5)
V. Khachatryan
  • Fonction : Auteur
P. Busson
C. Mironov
P. Paganini
J.-L. Agram
E. Conte
D. Contardo

Résumé

Transverse momentum spectra of charged particles are measured by the CMS experiment at the CERN LHC in pPb collisions at sqrt(s[NN]) =5.02 TeV, in the range 0.4 < pt < 120 GeVc and pseudorapidity abs(eta[CM]) < 1.8 in the proton-nucleon center-of-mass frame. For pt < 10 GeV, the charged-particle production is asymmetric about eta[CM] = 0, with smaller yield observed in the direction of the proton beam, qualitatively consistent with expectations from shadowing in nuclear parton distribution functions (nPDF). A pp reference spectrum at sqrt(s) = 5.02 TeV is obtained by interpolation from previous measurements at higher and lower center-of-mass energies. The pt distribution measured in pPb collisions shows an enhancement of charged particles with pt > 20 GeV compared to expectations from the pp reference. The enhancement is larger than predicted by perturbative quantum chromodynamic calculations that include antishadowing modifications of nPDFs.

Dates et versions

in2p3-01126679 , version 1 (06-03-2015)

Identifiants

Citer

V. Khachatryan, M. Besancon, F. Couderc, M. Dejardin, D. Denegri, et al.. Nuclear effects on the transverse momentum spectra of charged particles in pPb collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV. European Physical Journal C: Particles and Fields, 2015, 75, pp.237. ⟨10.1140/epjc/s10052-015-3435-4⟩. ⟨in2p3-01126679⟩
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