Identified hadron spectra at large transverse momentum in p+p and d+Au collisions at,√SNN=200 GeV

被引：255

作者：

Adams, J.

Aggarwal, M. M.

Ahammed, Z.

Amonett, J.

Anderson, B. D.

Anderson, M.

Arkhipkin, D.

Averichev, G. S.

Badyal, S. K.

Bai, Y.

Balewski, J.

Barannikova, O.

Barnby, L. S.

Baudot, J.

Bekele, S.

Belaga, V. V.

Bellingeri-Laurikainen, A.

Bellwied, R.

Bezverkhny, B. I.

Bharadwaj, S.

Bhasin, A.

Bhati, A. K.

Bichsel, H.

Bielcik, J.

Bielcikova, J.

Billmeier, A.

Bland, L. C.

Blyth, C. O.

Blyth, S. -L.

Bonner, B. E.

Botje, M.

Bouchet, J.

Brandin, A. V.

Bravar, A.

Bystersky, M.

Cadman, R. V.

Cai, X. Z.

Caines, H.

Sánchez, M. Calderón de la Barca

Castillo, J.

Catu, O.

Cebra, D.

Chajecki, Z.

Chaloupka, P.

Chattopadhyay, S.

Chen, H. F.

Chen, J. H.

Chen, Y.

Cheng, J.

Cherney, M.

机构：

[1] Bhabha Atom Res Ctr, Ctr Variable Energy Cyclotron, Kolkata 700064, W Bengal, India

[2] Argonne Natl Lab, Argonne, IL 60439 USA

[3] Univ Birmingham, Birmingham B15 2TT, W Midlands, England

[4] Brookhaven Natl Lab, Upton, NY 11973 USA

[5] CALTECH, Pasadena, CA 91125 USA

[6] Univ Calif Berkeley, Berkeley, CA 94720 USA

[7] Univ Calif Davis, Davis, CA 95616 USA

[8] Univ Calif Los Angeles, Los Angeles, CA 90095 USA

[9] Carnegie Mellon Univ, Pittsburgh, PA 15213 USA

[10] Creighton Univ, Omaha, NE 68178 USA

[11] AS CR, Inst Nucl Phys, Rez 25068, Czech Republic

[12] Joint Inst Nucl Res Dubna, Lab High Energy, Dubna, Russia

[13] Joint Inst Nucl Res Dubna, Particle Phys Lab, Dubna, Russia

[14] Goethe Univ Frankfurt, D-6000 Frankfurt, Germany

[15] Inst Phys, Bhubaneswar 751005, Orissa, India

[16] Indian Inst Technol, Bombay 400076, Maharashtra, India

[17] Indiana Univ, Bloomington, IN 47408 USA

[18] Inst Rech Subatom, Strasbourg, France

[19] Univ Jammu, Jammu 180001, India

[20] Kent State Univ, Kent, OH 44242 USA

[21] Inst Modern Phys, Lanzhou, Peoples R China

[22] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA

[23] MIT, Cambridge, MA 02139 USA

[24] Max Planck Inst Phys & Astrophys, D-80805 Munich, Germany

[25] Michigan State Univ, E Lansing, MI 48824 USA

[26] Moscow Engn Phys Inst, Moscow 115409, Russia

[27] CUNY City Coll, New York, NY 10031 USA

[28] NIKHEF H, NL-1009 DB Amsterdam, Netherlands

[29] Univ Utrecht, Amsterdam, Netherlands

[30] Ohio State Univ, Columbus, OH 43210 USA

[31] Panjab Univ, Chandigarh 160014, India

[32] Penn State Univ, University Pk, PA 16802 USA

[33] Inst High Energy Phys, Protvino, Russia

[34] Purdue Univ, W Lafayette, IN 47907 USA

[35] Univ Rajasthan, Jaipur 302004, Rajasthan, India

[36] Rice Univ, Houston, TX 77251 USA

[37] Univ Sao Paulo, Sao Paulo, Brazil

[38] Univ Sci & Technol China, Hefei 230026, Peoples R China

[39] Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China

[40] SUBATECH, Nantes, France

[41] Texas A&M Univ, College Stn, TX 77843 USA

[42] Univ Texas, Austin, TX 78712 USA

[43] Tsinghua Univ, Beijing 100084, Peoples R China

[44] Valparaiso Univ, Valparaiso, IN 46383 USA

[45] Warsaw Univ Technol, Warsaw, Poland

[46] Univ Washington, Seattle, WA 98195 USA

[47] Wayne State Univ, Detroit, MI 48201 USA

[48] HZNU, CCNU, Inst Particle Phys, Wuhan 430079, Peoples R China

[49] Yale Univ, New Haven, CT 06520 USA

[50] Univ Zagreb, HR-10002 Zagreb, Croatia

来源：

PHYSICS LETTERS B | 2006年 / 637卷 / 03期

基金：

中国国家自然科学基金; 巴西圣保罗研究基金会; 美国国家科学基金会; 英国工程与自然科学研究理事会;

关键词：

particle production; perturbative quantum chromodynamics; fragmentation function; Cronin effect and x(T)-scating;

D O I：

10.1016/j.physletb.2006.04.032

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the transverse momentum (PT) spectra for identified charged pions, protons and anti-protons from p + p and d + Au collisions at root sNN = 200 GeV. The spectra are measured around midrapidity (vertical bar y vertical bar < 0.5) over the range of 0.3 < PT < 10 GeV/c with particle identification from the ionization energy loss and its relativistic rise in the time projection chamber and time-of-flight in STAR. The charged pion and proton + anti-proton spectra at high PT in p + p and d + Au collisions are in good agreement with a phenomenological model (EPOS) and with next-to-leading order perturbative quantum chromodynamic (NLO pQCD) calculations with a specific fragmentation scheme and factorization scale. We found that all proton, anti-proton and charged pion spectra in p + p collisions follow x(T)-scating for the momentum range where particle production is dominated by hard processes (p(T) greater than or similar to 2 GeV/c). The nuclear modification factor around midrapidity is found to be greater than unity for charged pions and to be even larger for protons at 2 < PT < 5 GeV/c. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：161 / 169

页数：9

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