Semileptonic decays of 
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 meson to 
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-wave charmonium states

Rui, Zhou; Zhang, Jie; Zhang, Lili

doi:10.1103/physrevd.98.033007

Cited by 9 publications

(9 citation statements)

References 73 publications

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“…which satisfy the normalization ǫ 2 L = −1 and the orthogonality ǫ L • P 2 = 0. For a tensor charmonium, the polarization tensor ǫ µν (λ) with helicity λ can be constructed via the polarization vector ǫ µ [55][56][57], whose detail expressions can be found in Refs [52,53].…”

Section: Analytic Formulasmentioning

confidence: 99%

“…Motivated by the same idea, we have reason to believe that it is appropriate to analyze other factorization-inhibited decays, such as B → χ c2 K, in the PQCD approach. Moreover, we update the P -wave charmonium distribution amplitudes (DAs) according to our previous work [52], where the new universal nonperturbative objects are successful in describing the P -wave charmonium decays of B/B c meson [52][53][54].…”

Section: Introductionmentioning

confidence: 99%

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Revisiting nonfactorizable contributions to factorization-forbidden decays of $B$ mesons to charmonium

Li,

Jia,

Rui

2020

Preprint

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Motivated by the observed large rates of B → (χc0, χc2, hc)K decays by BABAR and Belle collaborations, we investigate the nonfactorizable contributions to these factorization-forbidden decays, which can occur via a gluon exchange between the cc system and the spectator quark. Our numerical results demonstrate that the spectator contributions are able to produce a large branching ratio consistent with experiments. As a by-product, we also study the Cabibbo-suppressed decays, such as B → (χc0, χc2, hc)π and the U-spin related Bs decay, which receive less attention from both theory and experiment. The calculated branching ratios reach the order of 10 −6 , which are in the scope of Belle-II and LHCb experiments. Besides, the CP -asymmetry parameters are also calculated for these decays. The obtained results are compared with available experimental data and numbers from other predictions. We also investigate the sources of theoretical uncertainties in our calculation.

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Section: Analytic Formulasmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Revisiting nonfactorizable contributions to factorization-forbidden decays of $B$ mesons to charmonium

Li,

Jia,

Rui

2020

Preprint

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“…where the parameter ξ can be constructed using v and v , and |H c (v ) can be one of state in Eqs. (11)(12)(13). The general form for ξ can be written as…”

Section: Heavy Quark Effective Theorymentioning

confidence: 99%

“…On the theoretical side, a few schemes are used to study the B c decays into a charmonium, such as the perturbative QCD (PQCD) approach [6][7][8][9][10][11][12][13][14], QCD sum rules (QCD SR) [15][16][17][18], light-cone sum rules (LCSR) [19,20], quark model (QM) [21][22][23][24][25][26][27], light-front quark model (LFQM) [28][29][30], nonrelativistic QCD (NRQCD) [31][32][33][34][35][36][37][38][39][40][41] and others [42]. Uncertainties in some of these schemes are hard to control especially in the nonperturbative region and power corrections are expected important [43].…”

Section: Introductionmentioning

confidence: 99%

Model-independent investigation of the RJ/ψ,ηc and ratios of decay widths of semileptonic Bc decays into a P-wave charmonium

Wang

Zhu

2019

Int. J. Mod. Phys. A

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Experimental measurements of decay branching fractions of semitaunic and semimuonic Bc into J/ψ has challenged the lepton flavor universality in standard model with about two standard deviations. In this paper, we first investigate the unitary constraint on form factors of Bc meson into S-wave and P -wave charmonium. Such constraint leads to the exploration of the R J/ψ and other ratios Rη c , R hc , and Rχ cJ in a model-independent way. These results together with future experimental measurements can be used to explore the lepton flavor universality in a more systematic way. In addition, we point out that the helicity-dependent ratios R L J/ψ and R ⊥ J/ψ can also provide complementary information. I. INTRODUCTIONWeak decays of heavy mesons play an important role in testing the standard model (SM) precisely and probing new physics effects beyond SM. In SM, the lepton interactions are universal for all three generations. Semileptonic decays of B mesons induced by the b → c transition have revealed hints lepton flavor non-university [1], which may indicate the presence of possible new physics (NP). To probe the NP effects in a more systematic way, more accurate and solid predictions of branching fractions are highly demanded. Ratios of semitaunic and semimuonicB decays intoD or D * , i.e. R D and R D * have been measured by many experiments such as BABAR [2], Belle [3], and LHCb [4]. These measurements indicate the data of R D and R D * deviate from the SM predictions by about 3σ. Recently, the LHCb collaboration have reported the measurement of the ratio of the semitaunic and semimuonic B + c decays into J/ψ, i.e. R J/ψ , using a sample of proton-proton collision data corresponding to 3.0f b −1 of integrated luminosity [5]. A deviation, about 2σ, from SM is found in this measurement by LHCb. On the theoretical side, a few schemes are used to study the B c decays into a charmonium, such as the perturbative QCD (PQCD) approach [6-14], QCD sum rules (QCD SR) [15-18], light-cone sum rules (LCSR) [19, 20], quark model (QM) [21-27], light-front quark model (LFQM) [28-30], nonrelativistic QCD (NRQCD) [31-41] and others [42]. Uncertainties in some of these schemes are hard to control especially in the nonperturbative region and power corrections are expected important [43]. At zero recoil, many of these theoretical investigations become less solid and the extrapolations must be used in order to access the full momentum dependence of form factors. On the lattice, HPQCD collaboration have calculated form factors for decays B c into the S-wave charmonium in the entire q 2 range, using a highly improved lattice quark action [44,45]. These works make the analysis of semileptonic B c decays sitting on a firm ground.In this paper, we will adopt a model-independent way to study the form factors of B c into the S-wave and P-wave charmonium in the entire phase space. Using the dispersion relation and crossing symmetry, we will give a new parametrization form expanded in a series of polynomials. The coefficients in the expansion can...

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“…Motivated by the same idea, we have reason to believe that it is appropriate to analyze other factorization-inhibited decays, such as , in the PQCD approach. Moreover, we update the P-wave charmonium distribution amplitudes (DAs) based on our previous study [53], where the new universal nonperturbative objects are successful in describing the P-wave charmonium decays of the meson [53][54][55]. The layout of this paper is as follows: In Section 2, we present our theoretical formulae based on the PQCD framework.…”

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confidence: 99%

Revisiting nonfactorizable contributions to factorization-forbidden decays of B mesons to charmonium *

Jia

Rui

2020

Chinese Phys. C

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Motivated by the large rates of decays observed by the and Belle collaborations, we investigate the nonfactorizable contributions to these factorization-forbidden decays, which can occur through a gluon exchange between the system and the spectator quark. Our numerical results demonstrate that the spectator contributions are capable of producing a large branching ratio consistent with the experiments. As a by-product, we also study the Cabibbo-suppressed decays, such as and the U-spin-related decay, which have so far received less theoretical and experimental attention. The calculated branching ratios reach the order of , which is within the scope of the Belle-II and LHCb experiments. Further, the -asymmetry parameters are also calculated for these decays. The obtained results are compared with the available experimental data and numbers from other predictions. We also investigate the sources of theoretical uncertainties in our calculation.

show abstract

Semileptonic decays of Bc meson to P -wave charmonium states

Cited by 9 publications

References 73 publications

Revisiting nonfactorizable contributions to factorization-forbidden decays of $B$ mesons to charmonium

Revisiting nonfactorizable contributions to factorization-forbidden decays of $B$ mesons to charmonium

Model-independent investigation of the RJ/ψ,ηc and ratios of decay widths of semileptonic Bc decays into a P-wave charmonium

Revisiting nonfactorizable contributions to factorization-forbidden decays of B mesons to charmonium *

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