Fractured Boer-Mulders effect in the production of polarized baryons

Journal Article · Mon Feb 01 04:00:00 EST 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.81.034029· OSTI ID:21409184

Sivers, Dennis ^[1]

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1. Portland Physics Institute, 4730 SW Macadam Avenue 101, Portland, Oregon 97239 (United States) and Spin Physics Center, University of Michigan, Ann Arbor, Michigan 48109-1040 (United States)

The fractured Boer-Mulders functions, {Delta}{sup N}M{sub B{up_arrow}/(q,q){up_arrow}:p}{sup q}(x,p{sub TN};z,p-vector{sub T{center_dot}}k-vector{sub T};Q{sup 2}), describe an intriguing class of polarization effects for the production of baryons in the target fragmentation region of deep-inelastic processes. These functions characterize transverse momentum asymmetries related to the spin orientation for different flavors of axial-vector diquarks,(q{sub i},q{sub j}){up_arrow}, in an unpolarized ensemble of protons just as the familiar Boer-Mulders functions characterize transverse momentum asymmetries connected to the spin orientation of quarks in unpolarized targets. The asymmetries in p{sub TN} of the fractured Boer-Mulders effect originating in the proton distribution function can be separated kinematically, both in semi-inclusive deep-inelastic scattering and in the Drell-Yan process, from the asymmetries in k{sub TN} of the polarizing fracture functions, {Delta}{sup N}M{sub B{up_arrow}/(q,q):p}{sup q}(x,p{sub T}{sup 2};z,k{sub TN};Q{sup 2}), generated during the soft color rearrangement of the fragmentation process. The experimental requirements for this separation are presented in this article and it is shown that the fractured Boer-Mulders effect should change sign between Drell-Yan and semi-inclusive deep-inelastic scattering while the polarizing fracture functions remain the same. Simple isospin arguments indicate the two polarization mechanisms should give significantly different results for the production of polarized {Lambda}'s and {Sigma}'s.

• OSTI ID: 21409184
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 3 Vol. 81; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
BARYONS
DEEP INELASTIC SCATTERING
DISTRIBUTION FUNCTIONS
DRELL MODEL
ELEMENTARY PARTICLES
FERMIONS
FRAGMENTATION
FUNCTIONS
HADRONS
HYPERONS
INELASTIC SCATTERING
INTERACTIONS
ISOSPIN
LAMBDA BARYONS
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
LINEAR MOMENTUM
NUCLEONS
ORIENTATION
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PARTICLE PROPERTIES
POLARIZATION
PROTONS
QUARKS
SCATTERING
SIGMA BARYONS
SPIN ORIENTATION
STRANGE PARTICLES
TRANSVERSE MOMENTUM