Chinese Physics C > 2017, Vol. 41 > Issue(1): 013101 DOI: 10.1088/1674-1137/41/1/013101

Branching fractions of B_(c)decays involving J/ψ andX(3872)

Y. K. Hsiao^1,2,3,
Chao-Qiang Geng^1,2,3

1.
Chongqing University of Posts &
2.
Physics Division, "
3.
Department of Physics, "

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Abstract：
We study two-body B _(c)→M _c(π,K) and semileptonic B _c→M _cl ^- ν _ldecays with M _c=(J/ψ,X _c ⁰), where X _c ⁰≡X ⁰(3872) is regarded as the tetraquark state c cu u(d d). With the decay constant f _{X_c⁰}=(234±52) MeV determined from the data, we predict that B(B ^-→X _c ⁰π ^-)=(11.5±5.7)×10 ^-6, B( B ⁰→X _c ⁰ K ⁰)=(2.1±1.0)×10 ^-4, and B( B _s ⁰→X _c ⁰ K ⁰)=(11.4±5.6)×10 ^-6. With the form factors in QCD models, we calculate that B(B _c ^-→X _c ⁰π ^-,X _c ⁰K ^-)=(6.0±2.6)×10 ^-5and (4.7±2.0)×10 ^-6, and B(B _c ^-→J/ψμ ^- ν _μ, X _c ⁰μ ^- ν _μ)=(2.3±0.6)×10 ^-2and (1.35±0.18)×10 ^-3, respectively, and extract the ratio of the fragmentation fractions to be f _c/ f _u=(6.4±1.9)×10 ^-3.
- B decays,
- Bc decays,
- J/,
- X(3872)

References

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Y. K. Hsiao and Chao-Qiang Geng. Branching fractions of B _(c)decays involving J/ψ and X(3872)[J]. Chinese Physics C, 2017, 41(1): 013101. doi: 10.1088/1674-1137/41/1/013101

Y. K. Hsiao and Chao-Qiang Geng. Branching fractions of B _(c)decays involving J/ψ and X(3872)[J]. Chinese Physics C, 2017, 41(1): 013101. doi:10.1088/1674-1137/41/1/013101 shu

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Received: 2016-07-18

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Supported in part by National Center for Theoretical Sciences, National Science Council (NSC-101-2112-M-007-006-MY3), MoST (MoST-104-2112-M-007-003-MY3) National Science Foundation of China (11675030)

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沈阳化工大学材料科学与工程学院沈阳 110142

Branching fractions of B_(c)decays involving J/ψ andX(3872)

Y. K. Hsiao^1,2,3,
Chao-Qiang Geng^1,2,3,

1. Chongqing University of Posts &
2. Physics Division, "
3. Department of Physics, "

Received Date:2016-07-18
Available Online:2017-01-05

Fund Project:Supported in part by National Center for Theoretical Sciences, National Science Council (NSC-101-2112-M-007-006-MY3), MoST (MoST-104-2112-M-007-003-MY3) National Science Foundation of China (11675030)

Abstract:We study two-body B_(c)→M_c(π,K) and semileptonic B_c→M_cl^-ν_ldecays with M_c=(J/ψ,X_c⁰), where X_c⁰≡X⁰(3872) is regarded as the tetraquark state ccuu(dd). With the decay constantf_{X_c⁰}=(234±52) MeV determined from the data, we predict thatB(B^-→X_c⁰π^-)=(11.5±5.7)×10^-6,B(B⁰→X_c⁰K⁰)=(2.1±1.0)×10^-4, andB(B_s⁰→X_c⁰K⁰)=(11.4±5.6)×10^-6. With the form factors in QCD models, we calculate thatB(B_c^-→X_c⁰π^-,X_c⁰K^-)=(6.0±2.6)×10^-5and (4.7±2.0)×10^-6, andB(B_c^-→J/ψμ^-ν_μ, X_c⁰μ^-ν_μ)=(2.3±0.6)×10^-2and (1.35±0.18)×10^-3, respectively, and extract the ratio of the fragmentation fractions to bef_c/f_u=(6.4±1.9)×10^-3.