Higher-Twist Dynamics in Large Transverse Momentum Hadron Production

被引:54
作者
Arleo, Francois [1 ]
Brodsky, Stanley J. [2 ,3 ]
Hwang, Dae Sung [4 ]
Sickles, Anne M. [5 ]
机构
[1] Univ Savoie, CNRS, LAPTH, UMR5108, F-74941 Annecy Le Vieux, France
[2] Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94309 USA
[3] CP3 Origins So Denmark Univ Odense, Odense, Denmark
[4] Sejong Univ, Dept Phys, Seoul 143747, South Korea
[5] Brookhaven Natl Lab, Upton, NY 11973 USA
关键词
CROSS-SECTIONS; ROOT-S; COLLISIONS; QUARK;
D O I
10.1103/PhysRevLett.105.062002
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
A scaling law analysis of the world data on inclusive large-p(perpendicular to) hadron production in hadronic collisions is carried out. Significant deviations from leading-twist perturbative QCD predictions at next-to-leading order are observed, particularly at high x(perpendicular to) = 2p(perpendicular to)/root s. In contrast, the production of prompt photons and jets exhibits near-conformal scaling behavior in agreement with leading-twist expectations. These results indicate a non-negligible contribution of higher-twist processes in large-p(perpendicular to) hadron production, where the hadron is produced directly in the hard subprocess, rather than by quark and gluon fragmentation. Predictions for the scaling exponents at RHIC and LHC are given. Triggering on isolated large-p(perpendicular to) hadron production will enhance the higher-twist processes. We also note that the use of isolated hadrons as a signal for new physics can be affected by the presence of direct hadron production.
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页数:4
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