{lambda}{sub b}{yields}p, {lambda} transition form factors from QCD light-cone sum rules

Journal Article · Thu Oct 01 04:00:00 EDT 2009 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.80.074012· OSTI ID:21325227

Yuming, Wang; Caidian, Lue ^[1]; Yuelong, Shen ^[2]

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1. Institute of High Energy Physics and Theoretical Physics Center for Science Facilities, P.O. Box 918(4) Beijing 100049 (China)
2. Institute of Physics, Academia Sinica, Taipei, Taiwan 115 (China)

Light-cone sum rules for the {lambda}{sub b}{yields}p, {lambda} transition form factors are derived from the correlation functions expanded by the twist of the distribution amplitudes of the {lambda}{sub b} baryon. In terms of the {lambda}{sub b} three-quark distribution amplitude models constrained by the QCD theory, we calculate the form factors at small momentum transfers and compare the results with those estimated in the conventional light-cone sum rules (LCSR) and perturbative QCD approaches. Our results indicate that the two different versions of sum rules can lead to the consistent numbers of form factors responsible for {lambda}{sub b}{yields}p transition. The {lambda}{sub b}{yields}{lambda} transition form factors from LCSR with the asymptotic {lambda} baryon distribution amplitudes are found to be almost 1 order larger than those obtained in the {lambda}{sub b}-baryon LCSR, implying that the preasymptotic corrections to the baryonic distribution amplitudes are of great importance. Moreover, the SU(3) symmetry breaking effects between the form factors f{sub 1}{sup {lambda}{sub b}}{sup {yields}}{sup p} and f{sub 1}{sup {lambda}{sub b}}{sup {yields}}{sup {lambda}} are computed as 28{sub -8}{sup +14}% in the framework of {lambda}{sub b}-baryon LCSR.

• OSTI ID: 21325227
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 7 Vol. 80; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
ASYMPTOTIC SOLUTIONS
COMPARATIVE EVALUATIONS
CORRELATION FUNCTIONS
DISTRIBUTION
FORM FACTORS
LAMBDA BARYONS
LAMBDA PARTICLES
LIGHT CONE
MOMENTUM TRANSFER
PARTICLE DECAY
QUANTUM CHROMODYNAMICS
QUARKS
SU-3 GROUPS
SUM RULES