scholarly journals Non-leptonic B Meson Decays using Perturbative QCD

1999 ◽  
Vol 52 (6) ◽  
pp. 949
Author(s):  
Ciprian Dariescu ◽  
Marina-Aura Dariescu
Keyword(s):  
Experimental Data ◽  
Theoretical Model ◽  
Perturbative Qcd ◽  
B Meson ◽  
B Decays ◽  
B Meson Decays ◽  
Meson Decays ◽  
Model Predictions

Using perturbative QCD within the framework of Szczepaniak et al. (1990), we analyse different non-leptonic B decays, namely B → Π Π , B → Π (K)D, B → DD, as heavy-to-light transitions dominated by tree diagrams and compare our estimates to experimental data and other theoretical model predictions.

scholarly journals FINAL STATE INTERACTIONS IN B → ππK AND $B\to K\overline{K}K$ DECAYS

2007 ◽  
Vol 22 (02n03) ◽  
pp. 645-648
Author(s):  
L. LEŚNIAK ◽  
R. KAMIŃSKI ◽  
B. EL-BENNICH ◽  
B. LOISEAU ◽  
A. FURMAN
Keyword(s):  
Experimental Data ◽  
Theoretical Model ◽  
Unitary Representation ◽  
B Meson ◽  
Final State ◽  
B Meson Decays ◽  
Meson Decays ◽  
Neutral B Meson ◽  
Final State Interactions

Analysis of charged and neutral B meson decays into π+π-K, K+K-K and [Formula: see text] is performed using a unitary representation of the ππ and [Formula: see text] final state interactions. Comparison of the theoretical model with the experimental data of the Belle and BaBar Collaborations indicates that charming penguin contributions are necessary to describe the B → f0(980) K and B → ρ(770)0 K decays.

scholarly journals |Vub| Determination by B → Dsπ

2003 ◽  
Vol 18 (22) ◽  
pp. 1557-1567 ◽  
Author(s):  
Hideaki Hayakawa ◽  
Kaoru Hosokawa ◽  
Takeshi Kurimoto
Keyword(s):  
Perturbative Qcd ◽  
B Meson ◽  
B Meson Decays ◽  
Meson Decays ◽  
Factorizable Contribution

We investigate [Formula: see text] decay in perturbative QCD approach which has recently been applied to B-meson decays. [Formula: see text] decay (and its charge conjugated mode) can be one of the hopeful modes to determine |Vub| since it occurs through b → u transition only. We estimate both factorizable and non-factorizable contribution, and show that the non-factorizable contribution is much less than the factorizable one. Our calculation gives [Formula: see text].

RADIATIVE B MESON DECAYS AT BABAR

2005 ◽  
Vol 20 (02n03) ◽  
pp. 658-660
Author(s):  
FABIO BELLINI
Keyword(s):  
Storage Ring ◽  
B Meson ◽  
Branching Ratio ◽  
B Decays ◽  
Neutral Currents ◽  
B Meson Decays ◽  
Meson Decays ◽  
Flavor Changing ◽  
Rare B Decays ◽  
Babar Detector

Recent BaBar results on rare B decays involving flavor changing neutral currents are presented. New measurements of the CP asymmetries in b→sγ and B→K*γ decays are reported as well as B→K(*)l+l- and b→sl+l- branching ratio measurements. The data sample comprises [Formula: see text] decays collected with the BaBar detector at the PEP-II e+e- storage ring.

scholarly journals Next-to-leading-logarithm threshold resummation for exclusive B meson decays

2021 ◽  
Vol 81 (7) ◽  
Author(s):  
Zhi-Qing Zhang ◽  
Hsiang-nan Li
Keyword(s):  
Perturbative Qcd ◽  
B Meson ◽  
Theoretical Uncertainty ◽  
Momentum Fraction ◽  
B Meson Decays ◽  
Meson Decays ◽  
Threshold Resummation ◽  
End Point ◽  
Mellin Transformation ◽  
Leading Logarithm

AbstractWe extend the threshold resummation of the large logarithms $$\ln x$$ ln x which appear in factorization formulas for exclusive B meson decays, x being a spectator momentum fraction, to the next-to-leading-logarithm (NLL) accuracy. It is shown that the NLL resummation effect provides suppression in the end-point region with $$x\sim 0$$ x ∼ 0 stronger than the leading-logarithm (LL) one, and thus improves perturbative analyses of the above processes. We revisit the $$B\rightarrow K\pi $$ B → K π decays under the NLL resummation in the perturbative QCD approach, and find that it induces up to 20% variation of the direct CP asymmetries in various modes relative to the LL results. Our method to avoid the Landau singularity in the inverse Mellin transformation causes at most 10% theoretical uncertainty.

scholarly journals MIRROR MATTER ADMIXTURES IN KS→γγ

2006 ◽  
Vol 21 (19n20) ◽  
pp. 4197-4207 ◽  
Author(s):  
G. SÁNCHEZ-COLÓN ◽  
A. GARCÍA
Keyword(s):  
Experimental Data ◽  
Theoretical Prediction ◽  
Mirror Symmetry ◽  
B Meson ◽  
Branching Ratio ◽  
New Physics ◽  
B Meson Decays ◽  
Mixing Angles ◽  
Meson Decays ◽  
Mirror Matter

The latest measurement of the KS→γγ branching ratio clearly shows an enhancement over the current theoretical prediction. As in other K and B meson decays, this invites to consider the possibility of the contribution of new physics. We study a particular form of the latter, which may be refered to as manifest mirror symmetry. The experimental data are described using previously determined values for the mixing angles of the admixtures of mirror matter in ordinary hadrons and by assuming that for π0, η, η′ → γγ, the mirror decay amplitudes have the same magnitudes as their ordinary counterparts.

scholarly journals Angular and polarization observables for Majorana-mediated B decays with effective interactions

2020 ◽  
Vol 80 (9) ◽  
Author(s):  
Lucía Duarte ◽  
Gabriel Zapata ◽  
Oscar A. Sampayo
Keyword(s):  
B Meson ◽  
Effective Field ◽  
B Decays ◽  
B Meson Decays ◽  
Effective Interactions ◽  
Meson Decays ◽  
Vector Interaction ◽  
Lepton Colliders ◽  
The Standard Model ◽  
Polarization Observables

AbstractWe probe the effective field theory extending the Standard Model with a sterile neutrino in B meson decays at B factories and lepton colliders, using angular and polarization observables. We put bounds on different effective operators characterized by their distinct Dirac–Lorentz structure, and probe the N-mediated B decays sensitivity to these interactions. We define a forward–backward asymmetry $$A_\mathrm{FB}^{\ell \gamma }$$ A FB ℓ γ between the muon and photon directions for the $$B \rightarrow \mu \nu \gamma $$ B → μ ν γ decay, which allows us to separate the SM contribution from the effective lepton number conserving and violating processes, mediated by a near on-shell N. Using the most stringent constraints on the effective parameter space from Belle and BaBar we find that a measurement of the final polarization $$P_{\tau }$$ P τ in the rare $$B^-\rightarrow \ell ^-_{1}\ell ^-_{2} \pi ^+$$ B - → ℓ 1 - ℓ 2 - π + decays can help us infer the scalar or vector interaction content in the N production or decay vertices. We find that the B meson decays are more sensitive to scalar operators.

scholarly journals Perturbative QCD analyses of the nonleptonic B meson decays

1996 ◽  
Vol 378 (1-4) ◽  
pp. 323-328 ◽  
Author(s):  
Ciprian Dariescu ◽  
Marina-Aura Dariescu
Keyword(s):  
Perturbative Qcd ◽  
B Meson ◽  
B Meson Decays ◽  
Meson Decays

scholarly journals QCD Factorization and Rare B Meson Decays

2006 ◽  
Vol 21 (04) ◽  
pp. 658-663 ◽  
Author(s):  
DONGSHENG DU
Keyword(s):  
Recent Progress ◽  
B Meson ◽  
Infrared Divergence ◽  
B Decays ◽  
B Meson Decays ◽  
Meson Decays ◽  
Power Corrections ◽  
Qcd Factorization ◽  
Charmless B Decays ◽  
Divergence Problem

Some recent progress in China in the study of charmless B decays with QCD factorization is reviewed. Chirally enhanced power corrections and infrared divergence problem are stressed.

scholarly journals Lepton flavor non-universality in B-meson decays from a U(2) flavor model

2015 ◽  
Vol 2015 (11) ◽  
Author(s):  
Adam Falkowski ◽  
Marco Nardecchia ◽  
Robert Ziegler
Keyword(s):  
B Meson ◽  
B Meson Decays ◽  
Meson Decays ◽  
Lepton Flavor
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