Radiative leptonic $$B_c\rightarrow \gamma \ell {\bar{\nu }}$$ B c → γ ℓ ν ¯ decay in effective field theory beyond leading order

Wang, Wei; Zhu, Ruilin

doi:10.1140/epjc/s10052-015-3583-6

Cited by 20 publications

(12 citation statements)

References 86 publications

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“…Firstly, we present our predictions for the branching ratio by just giving their center values, which are shown in Table 2. In our calculation, we adopt the cut condition for the photon energy From Table 2, one can see that the branching ratios are enhanced by about 27% in both the P A and P C cases, relative to our SM prediction, which is in agreement with the ones in the literatures [79][80][81][82][83][84][85].…”

Section: Effects Of Solutions Psupporting

confidence: 84%

Revisiting the one leptoquark solution to the R(D (∗)) anomalies and its phenomenological implications

Yang

Zhang

2016

J. High Energ. Phys.

175

107

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It has been shown recently that the anomalies observed inB → D ( * ) τν τ andB →K + − decays could be resolved with just one scalar leptoquark. Fitting to the current data on R(D ( * ) ) along with acceptable q 2 distributions inB → D ( * ) τν τ decays, four best-fit solutions for the operator coefficients have been found. In this paper, we explore the possibilities of how to discriminate these four solutions. Firstly, we find that two of them * With the discovery of heavy quark spin-flavor symmetry and the formulation of heavy quark effective theory (HQET) [1][2][3][4][5], it has become clear that the physical observables in semi-leptonic B → D ( * ) ν could be rather reliably predicted within the Standard Model (SM), especially at the zero recoil point, allowing therefore a reliable determination of the Cabibbo-Kobayashi-Maskawa (CKM) element V cb . It is also believed that the effect of New Physics (NP) beyond the SM should be tiny since these decays are induced by the tree-level charged current.However, the BaBar [6, 7], Belle [8,9] and LHCb [10] collaborations have recently observed anomalies in the ratios R(D ( * ) ) = B(B → D ( * ) τν τ ) B(B → D ( * ) ν ) , = e/µ . (1.1) The Heavy Flavor Average Group (HFAG) gives the average values [11] R(D) avg =0.397 ± 0.040 ± 0.028 , R(D * ) avg =0.316 ± 0.016 ± 0.010 , (1.2) which exceed the SM predictions [12, 13] R(D) SM =0.300 ± 0.008 , R(D * ) SM =0.252 ± 0.003 , (1.3) by 1.9σ and 3.3σ, respectively. Especially when the R(D)-R(D * ) correlation of −0.21 is taken into account, the tension with the SM predictions would be at 4.0σ level [11]. Theoretically, R(D) and R(D * ) can be rather reliably calculated, because they are independent of the CKM element |V cb | and, to a large extent, of the B → D ( * ) transition form factors.The above anomalies have been investigated extensively both within model-independent frameworks [14-35], as well as in some specific NP models where the b → cτν τ transition is mediated by leptoquarks [14, 15, 36-44], charged Higgses [14, 45-55], charged vector bosons [14, 56-58], and sparticles [ [59][60][61]. It is also interesting to point out that, besides the branching ratios, the measured differential distributions dΓ(B → D ( * ) τν)/dq 2 by BaBar [7] and Belle [8,9]

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Section: Effects Of Solutions Psupporting

confidence: 84%

Revisiting the one leptoquark solution to the R(D (∗)) anomalies and its phenomenological implications

Yang

Zhang

2016

J. High Energ. Phys.

175

107

View full text Add to dashboard Cite

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“…Meanwhile the NRQCD factorization has been adopted in refs. [18][19][20][21][22][23][24][25][26], in which the non-perturbative physics reside in a few NRQCD matrix elements. The LHCb collaboration has started comprehensive experimental studies of the decays [27], and some phenomenological studies can be found in refs.…”

Section: Jhep12(2017)012mentioning

confidence: 99%

“…In the literatures, the covariant projection approach are commonly used [21,[44][45][46]. Generally, one applies the replacements…”

Section: Jhep12(2017)012mentioning

confidence: 99%

Relativistic corrections to light-cone distribution amplitudes of S-wave Bc mesons and heavy quarkonia

Wang

Yang

et al. 2017

J. High Energ. Phys.

Self Cite

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In collinear factorization, light-cone distribution amplitudes (LCDAs) are key ingredients to calculate the production rate of a hadron in high energy exclusive processes. For a doubly-heavy meson system (such as B c , J/ψ, Υ etc), the LCDAs contain perturbative scales that can be integrated out and then are re-factorized into products of perturbatively calculable distribution parts and non-relativistic QCD matrix elements. In this re-factorization scheme, the LCDAs are known at next-to-leading order in the strong coupling constant α s and at leading order in the velocity expansion. In this work, we calculate the O(v 2 ) corrections to twist-2 LCDAs of S-wave B c mesons. These results are applicable to heavy quarkonia like η c,b , J/ψ and Υ by setting m b = m c . We apply these relativistically corrected LCDAs to study their inverse moments and a few Gegenbauer moments which are important for phenomenological study. We point out that the relativistic corrections are sizable, and comparable with the next-to-leading order radiative corrections. These results for LCDAs are useful in future theoretical analyses of the productions of heavy quarkonia and B c mesons.

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“…And the studies of the rare weak annihilation decays of the B c meson are few, some of which can be found in Refs. [11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Form factors for semileptonic Bc decays into η , η′ and glueballs

Zhu

Han

et al. 2018

Phys. Rev. D

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We calculated the form factors of Bc transitions into η ( ) meson and pseudoscalar Glueball, where the Bc meson is a bound state of two different heavy flavors and is treated as a nonrelativistic state, while the mesons η ( ) and Glueball are treated as light-cone objects since their masses are smaller enough compared to the transition momentum scale. The mechanism of two gluon scattering into η ( ) dominated the form factors of Bc decays into η ( ) . We considered the η − η −Glueball mixing effect, and then obtained their influences on the form factors. The form factors of Bc transitions into η ( ) and pseudoscalar Glueball in the maximum momentum recoil point were obtained as follows: f η 0,+ (q 2 = 0) = 1.38 +0.00 −0.02 ×10 −3 , f η 0,+ (q 2 = 0) = 0.89 +0.11 −0.10 ×10 −2 and f G 0,+ (q 2 = 0) = 0.44 +0.13 −0.05 ×10 −2 . Also phenomenological discussions for semileptonic Bc → η ( ) + +ν , Bc → G(0 −+ ) + +ν and Ds → η + +ν decays are given.

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Radiative leptonic $$B_c\rightarrow \gamma \ell {\bar{\nu }}$$ B c → γ ℓ ν ¯ decay in effective field theory beyond leading order

Cited by 20 publications

References 86 publications

Revisiting the one leptoquark solution to the R(D (∗)) anomalies and its phenomenological implications

Revisiting the one leptoquark solution to the R(D (∗)) anomalies and its phenomenological implications

Relativistic corrections to light-cone distribution amplitudes of S-wave Bc mesons and heavy quarkonia

Form factors for semileptonic Bc decays into η , η′ and glueballs

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