Covariant light-front approach for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>B</mml:mi><mml:mi>c</mml:mi></mml:msub></mml:math>transition form factors

Wang, Wei; Shen, Yue-Long; Lü, C.

doi:10.1103/physrevd.79.054012

Cited by 157 publications

(163 citation statements)

References 37 publications

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“…The masses of quarks (in units of GeV) are used as [31][32][33][34][35][36][37][38][39] The β parameters in the wave functions of the doubly and singly heavy flavor baryons are approximately the same as those of the corresponding mesons, since the heavy-light diquark behaves a color antitriplet just like an heavy antiquark. Taking ++ cc as an example, β c[cu] ≈ β cc , which is the β parameter of η c .…”

Section: Numerical Results For Transition Form Factorsmentioning

confidence: 99%

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Weak decays of doubly heavy baryons: the $$1/2\rightarrow 1/2$$ 1 / 2 → 1 / 2 case

2017

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− bb and focus on the decays into spin 1/2 baryons in this paper. At the quark level these decay processes are induced by the c → d/s or b → u/c transitions, and the two spectator quarks can be viewed as a scalar or axial vector diquark. We first derive the hadronic form factors for these transitions in the light-front approach and then apply them to predict the partial widths for the semileptonic and nonleptonic decays of doubly heavy baryons. We find that the number of decay channels is sizable and can be examined in future measurements at experimental facilities like LHC, Belle II and CEPC.

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Section: Numerical Results For Transition Form Factorsmentioning

confidence: 99%

“…This approach has been widely applied to various mesonic transitions [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39], and some analyses of baryonic transitions in this approach can be found in Refs. [40][41][42].…”

Section: Introductionmentioning

confidence: 99%

Weak decays of doubly heavy baryons: the $$1/2\rightarrow 1/2$$ 1 / 2 → 1 / 2 case

2017

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“…The LHCb collaboration has started comprehensive experimental studies of the decays [27], and some phenomenological studies can be found in refs. [28][29][30][31][32].…”

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.

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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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“…Some of them are: the nonrelativistic QCD [6,7], the Bethe-Salpeter relativistic quark model [8], the relativistic quark model [9][10][11], the light-cone QCD sum rules approach [12,13], the covariant light-front model [14], the nonrelativistic quark model [15], the QCD potential model [16][17][18], and the lightfront quark model [19]. The perturbative QCD (pQCD) [20,21] is one of the recently developed theoretical tools based on QCD to deal with the nonleptonic and semileptonic B decays.…”

Section: Br(b +mentioning

confidence: 99%

Semileptonic decays of $$B_c$$ B c meson to S-wave charmonium states in the perturbative QCD approach

et al. 2016

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Inspired by the recent measurement of the ratio of B c branching fractions to J/ψπ + and J/ψμ + ν μ final states at the LHCb detector, we study the semileptonic decays of B c meson to the S-wave ground and radially excited 2S and 3S charmonium states with the perturbative QCD approach. After evaluating the form factors for the transitions B c → P, V , where P and V denote pseudoscalar and vector S-wave charmonia, respectively, we calculate the branching ratios for all these semileptonic decays. The theoretical uncertainty of hadronic input parameters are reduced by utilizing the light-cone wave function for the B c meson. It is found that the predicted branching ratios range from 10 −7 up to 10 −2 and could be measured by the future LHCb experiment. Our prediction for the ratio of branching fractionsis in good agreement with the data. For B c → V lν l decays, the relative contributions of the longitudinal and transverse polarization are discussed in different momentum transfer squared regions. These predictions will be tested on the ongoing and forthcoming experiments.

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Covariant light-front approach forBctransition form factors

Abstract: These predictions will be tested on the ongoing and forthcoming hadron colliders.

Cited by 157 publications

References 37 publications

Weak decays of doubly heavy baryons: the $$1/2\rightarrow 1/2$$ 1 / 2 → 1 / 2 case

Weak decays of doubly heavy baryons: the $$1/2\rightarrow 1/2$$ 1 / 2 → 1 / 2 case

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

Semileptonic decays of $$B_c$$ B c meson to S-wave charmonium states in the perturbative QCD approach

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