Roles of scalar mesons in charmless ${\Lambda }_b$ decays

Abstract

We first study the charmless two-body ${\Lambda }_b$ decays with the scalar mesons as the final states and predict that $\mathcal{B}({\Lambda }_b\to \Lambda f_0(980,1500))=(2.9\pm 0.7,12.4\pm 3.8)\times 10^{-6}$ and $\mathcal{B}({\Lambda }_b\to p{K}_0^{\ast -}(800,1430))=(1.9\pm 0.5,14.1\pm 4.5)\times 10^{-6}$. With the resonant $f_0(980,1500)\to ({\pi }^{+}{\pi }^{-},K^{+}{K}^{-})$ and $K_0^{\ast -}\to {\bar{K}}^0{\pi }^{-}$ decays, we then obtain $\mathcal{B}({\Lambda }_b\to \Lambda ({\pi }^{+}{\pi }^{-},K^{+}{K}^{-}))=(4.2\pm 1.0,3.5\pm 0.7)\times 10^{-6}$ and $\mathcal{B}({\Lambda }_b\to p{\bar{K}}^0{\pi }^{-})=(10.4\pm 2.9)\times 10^{-6}$, in comparison with the data of $(4.6\pm 1.9,15.9\pm 2.6)\times 10^{-6}$ and $(12.6\pm 4.0)\times 10^{-6}$ from LHCb, respectively. Our results for ${\Lambda }_b\to \Lambda {\pi }^{+}{\pi }^{-}$ and ${\Lambda }_b\to p{\bar{K}}^0{\pi }^{-}$ would be regarded as the first evidences of the scalar meson productions in the anti-triplet $b$-baryon decays. The smaller predicted value of $\mathcal{B}({\Lambda }_b\to \Lambda K^{+}{K}^{-})$ indicates the existences of other resonant contributions to the decay, such as ${\Lambda }_b\to K^{-}(N^{\ast +}\to )\Lambda K^{+}$.

arXiv comment8 pages, 1 figure, revised version accepted by PRD

References in corpus (22)

• Observation of $J/\psi p$ resonances consistent with pentaquark states in ${\Lambda }_b^0\to J/\psi K^{-}p$ decays
• Experimental Tests of Factorization in Charmless Non-Leptonic Two-Body B Decays
• Scalar mesons above and below 1 GeV
• Charmless hadronic B decays involving scalar mesons: Implications to the nature of light scalar mesons
• Tetraquark Mesons in Large $N$ Quantum Chromodynamics
• Form Factors and Strong Couplings of Heavy Baryons from QCD Light-Cone Sum Rules
• Measurement of resonant and $CP$ components in ${\overline{B}}_s^0\to J/\psi {\pi }^{+}{\pi }^{-}$ decays
• Measurement of the resonant and CP components in ${\overline{B}}^0\to J/\psi {\pi }^{+}{\pi }^{-}$ decays
• Evaluating decay Rates and Asymmetries of ${\Lambda }_b$ into Light Baryons in LFQM
• Heavy-to-light baryonic form factors at large recoil
• Polarization effects in the cascade decay Lambda_b -> Lambda(-> p pi-) + J/psi(-> l+ l-) in the covariant confined quark model
• Direct CP violation in ${\Lambda }_b$ decays
• Study of scalar mesons f_0(980) and f_0(1500) from $B\to f_0(980)K$ and $B\to f_0(1500)K$ Decays
• Searches for ${\Lambda }_b^0$ and ${\Xi }_b^0$ decays to $K_{\mathrm{S}}^{0}p{\pi }^{-}$ and $K_{\mathrm{S}}^{0}p{K}^{-}$ final states with first observation of the ${\Lambda }_b^0\to K_{\mathrm{S}}^{0}p{\pi }^{-}$ decay
• Observations of ${\Lambda }_b^0\to \Lambda K^{+}{\pi }^{-}$ and ${\Lambda }_b^0\to \Lambda K^{+}{K}^{-}$ decays and searches for other ${\Lambda }_b^0$ and ${\Xi }_b^0$ decays to $\Lambda h^{+}{h}^{\prime -}$ final states
• Direct CP Violation in Λ_b -> n (Λ)π^+π^- Decays via ρ-ωMixing
• Pentaquarks from intrinsic charms in ${\Lambda }_b$ decays
• Charmful two-body anti-triplet $b$-baryon decays
• Factorization and angular distribution asymmetries in charmful baryonic B decays
• T-violating triple product asymmetries in Lambda_b --> Lambda pi pi decay
• Search for $XYZ$ states in ${\Lambda }_b$ decays at the LHCb
• Semileptonic $B^{-}\to f_0(1710,1500,1370)e^{-}{\bar{\nu }}_e$ decays

Cited by in corpus (1)

• Anti-triplet charmed baryon decays with SU(3) Flavor Symmetry