Relations among Bc → J/ψ, ηc form factors

Colangelo, P.; Fazio, F. De; Loparco, Francesco; Losacco, Nicola; Novoa-Brunet, Martín

doi:10.1007/jhep09(2022)028

Cited by 8 publications

(6 citation statements)

References 76 publications

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“…The x-dependence of the matrix element M 0 (x) = M (v )| ψ + (x)Γψ + (x)|M(v) can be obtained exploiting the dependence in the effective theory [1,16,17] obtaining…”

Section: Relations Between Universal Functionsmentioning

confidence: 99%

“…The details can be found in Ref. [1]. In Section 4 we present the main result and discuss its implications.…”

Section: Introductionmentioning

confidence: 96%

“…In this contribution, we describe the analysis at the next-to-leading order in the expansion performed in Ref. [1], where we established further relations among the form factors and a set of universal functions based on the heavy quark spin symmetry and the power counting rules of nonrelativistic QCD (NRQCD). In Section 2 we introduce the relevant form factors, to then we give an outline of the calculation in Section 3.…”

Section: Introductionmentioning

confidence: 99%

“…

…”

mentioning

confidence: 99%

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Implications of Heavy Quark Spin Symmetry and NRQCD on B_c → J/ψ, η_c form factors

Novoa-Brunet

2022

EPJ Web Conf.

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We discuss the analysis of Bc → J/ψ, ηc form factors, based on the heavy quark spin symmetry and nonrelativistic QCD (NRQCD) performed in Ref. [1]. We perform an expansion on the inverse of the heavy quarks’ masses using power counting rules of NRQCD up to the next-to-leading order. This allows us to classify the heavy quark spin symmetry-breaking terms and express the form factors in terms of universal functions in a selected kinematical range. Using as input the lattice QCD results for the Bc → J/ψ matrix element of the SM operator, we obtain information on other form factors.

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“…The x-dependence of the matrix element M 0 (x) = M (v )| ψ + (x)Γψ + (x)|M(v) can be obtained exploiting the dependence in the effective theory [1,16,17] obtaining…”

Section: Relations Between Universal Functionsmentioning

confidence: 99%

“…The details can be found in Ref. [1]. In Section 4 we present the main result and discuss its implications.…”

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

“…

…”

mentioning

confidence: 99%

See 2 more Smart Citations

Implications of Heavy Quark Spin Symmetry and NRQCD on B_c → J/ψ, η_c form factors

Novoa-Brunet

2022

EPJ Web Conf.

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“…where denotes the masses of the heavy quarks and the currents defined in [21]. The → / , matrix elements of the various currents in ( 8) can be expressed using the trace formalism [15], describing the lowest-lying S-wave ¯ and ¯ bound states as in (4) [11].…”

Section: Pos(ichep2022)712mentioning

confidence: 99%

Investigating $B_c$ semileptonic decays

Loparco¹

2022

Proceedings of 41st International Conference on High Energy Physics — PoS(ICHEP2022)

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$$ {B}_c^{-}\to J/\psi \left(\to {\mu}^{+}{\mu}^{-}\right){\tau}^{-}\left(\to {\pi}^{-}{\nu}_{\tau },{\rho}^{-}{\nu}_{\tau },{\ell}^{-}{\overline{\nu}}_{\ell }{\nu}_{\tau}\right){\overline{\nu}}_{\tau } $$ decays with visible final-state kinematics

Yang

et al. 2023

J. High Energ. Phys.

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The semitauonic $$ {B}_c^{-}\to J/\psi {\tau}^{-}{\overline{\nu}}_{\tau } $$ B c − → J / ψ τ − ν ¯ τ decay provides an ideal and clean mode to scrutinize possible new physics effects in $$ b\to c{\tau}^{-}{\overline{\nu}}_{\tau } $$ b → c τ − ν ¯ τ transitions as indicated by the current data on R(D(*)) anomalies. In this work, we use the spin density matrix method to obtain the maximum information on the underlying physics of $$ {B}_c^{-}\to J/\psi {\tau}^{-}{\overline{\nu}}_{\tau } $$ B c − → J / ψ τ − ν ¯ τ decay with both polarized τ lepton and J/ψ meson. Their subsequent decays, with J/ψ → μ+μ− as well as τ− → π−ντ, τ− → ρ−ντ and $$ {\tau}^{-}\to {\ell}^{-}{\overline{\nu}}_{\ell }{\nu}_{\tau } $$ τ − → ℓ − ν ¯ ℓ ν τ , are exploited to extract the energy and angular distributions of the charged final-state particles in the processes. Starting with the most general effective Hamiltonian relevant for the $$ b\to c{\tau}^{-}{\overline{\nu}}_{\tau } $$ b → c τ − ν ¯ τ transitions, including all possible Lorentz structures of the dimension-six operators with both left- and right-handed neutrinos, we first derive the five-fold differential decay rate in terms of the visible final-state kinematics. From this distribution, we then construct in total 34 normalized observables, among which nine refer to the CP-violating triple product asymmetries that vanish within the Standard Model. We also construct five new observables based on the combinations of these normalized observables that can only be attributed to the right-handed neutrinos. On the other hand, considering the low statistics of the fully differential distribution, we introduce some integrated observables with only one kinematic variable left, which are more promising to be measured due to the largely increased statistics. The sensitivities of all these observables to the different new physics scenarios are investigated in detail. Finally, assuming an ideal circumstance, we give an estimate of the statistical uncertainties of the nine CP-conserving observables at LHCb and found that τ− → π−ντ has the highest analyzing power among the three τ decay channels.

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Relations among Bc → J/ψ, ηc form factors

Cited by 8 publications

References 76 publications

Implications of Heavy Quark Spin Symmetry and NRQCD on B_c → J/ψ, η_c form factors

Implications of Heavy Quark Spin Symmetry and NRQCD on B_c → J/ψ, η_c form factors

Investigating $B_c$ semileptonic decays

$$ {B}_c^{-}\to J/\psi \left(\to {\mu}^{+}{\mu}^{-}\right){\tau}^{-}\left(\to {\pi}^{-}{\nu}_{\tau },{\rho}^{-}{\nu}_{\tau },{\ell}^{-}{\overline{\nu}}_{\ell }{\nu}_{\tau}\right){\overline{\nu}}_{\tau } $$ decays with visible final-state kinematics

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Relations among Bc → J/ψ, ηc form factors

Cited by 8 publications

References 76 publications

Implications of Heavy Quark Spin Symmetry and NRQCD on Bc → J/ψ, ηc form factors

Implications of Heavy Quark Spin Symmetry and NRQCD on Bc → J/ψ, ηc form factors

Investigating $B_c$ semileptonic decays

$$ {B}_c^{-}\to J/\psi \left(\to {\mu}^{+}{\mu}^{-}\right){\tau}^{-}\left(\to {\pi}^{-}{\nu}_{\tau },{\rho}^{-}{\nu}_{\tau },{\ell}^{-}{\overline{\nu}}_{\ell }{\nu}_{\tau}\right){\overline{\nu}}_{\tau } $$ decays with visible final-state kinematics

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Implications of Heavy Quark Spin Symmetry and NRQCD on B_c → J/ψ, η_c form factors

Implications of Heavy Quark Spin Symmetry and NRQCD on B_c → J/ψ, η_c form factors