Evidence for parton kT effects in high-pT particle production

被引：130

作者：

Apanasevich, L ^{[1
]}

Bacigalupi, J

Baker, W

Begel, M

Blusk, S

Bromberg, C

Chang, P

Choudhary, B

Chung, WH

de Barbaro, L

DeSoi, W

Dlugosz, W

Dunlea, J

Engels, E

Fanourakis, G

Ferbel, T

Ftacnik, J

Garelick, D

Ginther, G

Glaubman, M

Gutierrez, P

Hartman, K

Huston, J

Johnstone, C

Kapoor, V

Kuehler, J

Lirakis, C

Lobkowicz, F

Lukens, P

Mani, S

Mansour, J

Maul, A

Miller, R

Oh, BY

Osborne, G

Pellett, D

Prebys, E

Roser, R

Shepard, P

Shivpuri, R

Skow, D

Slattery, P

Sorrell, L

Striley, D

Toothacker, W

Varelas, N

Weerasundara, D

Whitmore, JJ

Yasuda, T

Yosef, C

机构：

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

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

[3] Univ Delhi, Delhi 110007, India

[4] Northeastern Univ, Boston, MA 02115 USA

[5] Univ Oklahoma, Norman, OK 73019 USA

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

[7] Univ Pittsburgh, Pittsburgh, PA 15260 USA

[8] Univ Rochester, Rochester, NY 14627 USA

来源：

PHYSICAL REVIEW LETTERS | 1998年 / 81卷 / 13期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.81.2642

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Inclusive pi(0) and direct-photon cross sections in the kinematic range 3.5 < p(T) < 12 GeV/c with central rapidities (y(cm)) are presented for 530 and 800 GeV/c proton beams and a 515 GeV/c pi(-) beam incident on Be targets. Current next-to-leading-order perturbative QCD calculations fail to adequately describe the data for conventional choices of scales. Kinematic distributions from these hard scattering events provide evidence that the interacting partons carry significant initial-state parton transverse momentum (k(T)) Incorporating these k(T) effects phenomenologically greatly improves the agreement between calculations and the measured cross sections. [S0031-9007(98)07206-8].

引用

页码：2642 / 2645

页数：4

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