B{yields}{pi}l{nu}{sub l} width and |V{sub ub}| from QCD light-cone sum rules

Journal Article · Sun May 01 04:00:00 EDT 2011 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.83.094031· OSTI ID:21541618

Khodjamirian, A; Mannel, Th; Wang, Y -M ^[1]; Offen, N ^[2]

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1. Theoretische Physik 1, Physik Department, Universitaet Siegen, D-57068, Siegen (Germany)
2. Institut fuer Theoretische Physik, Universitaet Regensburg, D-93040, Regensburg (Germany)

We employ the B{yields}{pi} form factors obtained from QCD light-cone sum rules and calculate the B{yields}{pi}l{nu}{sub l} width (l=e, {mu}) in units of 1/|V{sub ub}|{sup 2}, integrated over the region of accessible momentum transfers, 0{<=}q{sup 2{<=}}12.0 GeV{sup 2}. Using the most recent BABAR Collaboration measurements we extract |V{sub ub}|=(3.50{sub -0.33}{sup +0.38}|{sub th{+-}}0.11|{sub exp})x10{sup -3}. The sum rule results for the form factors, taken as an input for a z-series parametrization, yield the q{sup 2} shape in the whole semileptonic region of B{yields}{pi}l{nu}{sub l}. We also present the charged lepton energy spectrum in this decay. Furthermore, the current situation with B{yields}{tau}{nu}{sub {tau}} is discussed from the QCD point of view. We suggest using the ratio of the B{yields}{pi}{tau}{nu}{sub {tau}} and B{yields}{pi}l{nu}{sub l}(l={mu},e) widths as an additional test of the standard model. The sensitivity of this observable to new physics is illustrated by including a charged Higgs-boson contribution in the semileptonic decay amplitude.

• OSTI ID: 21541618
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 9 Vol. 83; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
B MESONS
BEAUTY MESONS
BEAUTY PARTICLES
BOSONS
DECAY
DIMENSIONLESS NUMBERS
ELEMENTARY PARTICLES
ENERGY SPECTRA
EQUATIONS
FERMIONS
FIELD THEORIES
FORM FACTORS
GRAND UNIFIED THEORY
HADRONS
HEAVY LEPTONS
HIGGS BOSONS
LEPTONS
LIGHT CONE
MASSLESS PARTICLES
MATHEMATICAL MODELS
MESONS
MOMENTUM TRANSFER
NEUTRINOS
PARTICLE DECAY
PARTICLE MODELS
PARTICLE PROPERTIES
PIONS
POSTULATED PARTICLES
PSEUDOSCALAR MESONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
SEMILEPTONIC DECAY
SENSITIVITY
SPACE-TIME
SPECTRA
STANDARD MODEL
SUM RULES
TAU NEUTRINOS
TAU PARTICLES
UNIFIED GAUGE MODELS
WEAK PARTICLE DECAY