scholarly journals Threshold resummation for nonleptonic B meson decays

2003 ◽  
Vol 555 (3-4) ◽  
pp. 197-205 ◽  
Author(s):  
Hsiang-nan Li ◽  
Kazumasa Ukai
Keyword(s):  
B Meson ◽  
B Meson Decays ◽  
Meson Decays ◽  
Threshold Resummation

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 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

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].

scholarly journals Composite leptoquarks and anomalies in B-meson decays

2015 ◽  
Vol 2015 (5) ◽  
Author(s):  
Ben Gripaios ◽  
M. Nardecchia ◽  
S. A. Renner
Keyword(s):  
B Meson ◽  
B Meson Decays ◽  
Meson Decays
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