Strong longitudinal color-field effects in pp collisions at energies available at the CERN Large Hadron Collider

被引：13

作者：

Pop, V. Topor ^{[1
]}

Gyulassy, M. ^{[2
]}

Barrette, J. ^{[1
]}

Gale, C. ^{[1
]}

Warburton, A. ^{[1
]}

机构：

[1] McGill Univ, Montreal, PQ H3A 2T8, Canada

[2] Columbia Univ, New York, NY 10027 USA

来源：

PHYSICAL REVIEW C | 2011年 / 83卷 / 02期

基金：

加拿大自然科学与工程研究理事会;

关键词：

PARTICLE MULTIPLICITY DISTRIBUTIONS; PROTON-ANTIPROTON COLLISIONS; TRANSVERSE-MOMENTUM SPECTRA; MONTE-CARLO MODEL; SQUARE-ROOT-S; CHARGED-PARTICLES; ROOT-S=900 GEV; CM ENERGIES; PHYSICS; EVENT;

D O I：

10.1103/PhysRevC.83.024902

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

We study the effect of strong longitudinal color fields (SCF) in p + p reactions up to Large Hadron Collider (LHC) energies in the framework of the HIJING/B (B) over bar (v2.0) model that combines (collinear factorized) perturbative quantum chromodynamics multiple minijet production with soft longitudinal string excitation and hadronization. The default vacuum string tension kappa(0) = 1 GeV/fm, is replaced by an effective energy-dependent string tension kappa(s) =kappa(0)(s/s(0))(0.06) that increases monotonically with center-of-mass energy. The exponent lambda = 0.06 is found sufficient to reproduce well the energy dependence of multiparticle observables in the Relativistic Heavy Ion Collider, Tevatron, as well as recent LHC data. This exponent is half of that predicted by the color glass saturation (CGC) model, lambda(CGC) = 0.115, where gluon fusion multiparticle production mechanisms are assumed. In HIJING/B (B) over bar (v2.0), the rapid growth of dN(ch)/d eta with energy is due to the interplay of copious minijet production with increasing SCF contributions. The large (strange) baryon-to-meson ratios measured at Tevatron energies are well described. A significant enhancement of these ratios is predicted up to the highest LHC energy (14 TeV). The effect of JJ loops and SCF on baryon-antibaryon asymmetry, and its relation to baryon number transport, is also discussed.

引用

页数：12

共 35 条

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