Polarization asymmetry in dilepton production in perturbative quantum chromodynamics

Bajpai, R. P. ; Noman, M. ; Ramachandran, R. (1981) Polarization asymmetry in dilepton production in perturbative quantum chromodynamics Physical Review D - Particles, Fields, Gravitation and Cosmology, 24 (7). pp. 1832-1840. ISSN 1550-7998

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Official URL: http://prd.aps.org/abstract/PRD/v24/i7/p1832_1

Related URL: http://dx.doi.org/10.1103/PhysRevD.24.1832


Quantum-chromodynamics (QCD) evolution equations together with angular momentum sum rules are used to examine the polarization structures of the quark sea and gluons in hadrons. It is shown that it is possible to sustain large polarizations of the flavor-singlet components and they would in turn imply large asymmetries in the dilepton production by polarized beam on polarized target, which can be calculated in perturbative QCD. At high qT for the μ+μ- pair, the main contributing diagram is quark-gluon Compton scattering, and the extent of gluon polarization is expected to be revealed in this kinematic region. At lower qT the quark-antiquark annihilation diagram becomes increasingly important and correspondingly polarized-sea-quark-induced asymmetries are to be found in this region. Further, since the polarization depends on the number of flavors excited, as the available energy in the hadron collision changes, the magnitude of asymmetries should show dramatic variations.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:39086
Deposited On:06 May 2011 12:46
Last Modified:06 May 2011 12:46

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