Fragmentation fractions of two-body b-baryon decays

Abstract

We study the fragmentation fractions $(f_{{\mathbf{B}}_b})$ of the $b$-quark to b-baryons (${\mathbf{B}}_b$). By the assumption of $f_{{\Lambda }_b}/(f_u+f_d)=0.25\pm 0.15$ in accordance with the measurements by LEP, CDF and LHCb Collaborations, we estimate that $f_{{\Lambda }_b}=0.175\pm 0.106$ and $f_{{\Xi }_b^{-,0}}=0.019\pm 0.013$. From these fragmentation fractions, we derive $\mathcal{B}({\Lambda }_b\to J/\psi \Lambda )=(3.3\pm 2.1)\times 10^{-4}$, $\mathcal{B}({\Xi }_b^{-}\to J/\psi {\Xi }^{-})=(5.3\pm 3.9)\times 10^{-4}$ and $\mathcal{B}({\Omega }_b^{-}\to J/\psi {\Omega }^{-})>1.9\times 10^{-5}$. The predictions of $\mathcal{B}({\Lambda }_b\to J/\psi \Lambda )$ and $\mathcal{B}({\Xi }_b^{-}\to J/\psi {\Xi }^{-})$ clearly enable us to test the theoretical models, such as the QCD factorization approach in the $b$-baryon decays.

arXiv comment10 pages, 1 figure, to be published in PLB

References in corpus (25)

• Big-Bang Nucleosynthesis
• Experimental Tests of Factorization in Charmless Non-Leptonic Two-Body B Decays
• Measurement of b hadron production fractions in 7 TeV pp collisions
• Charmless Hadronic Two-body Decays of B_u and B_d Mesons
• Nonleptonic Weak Decays of Bottom Baryons
• Lattice QCD and QCD Sum Rule determination of the decay constants of eta_c, J/psi and hc states
• Exclusive Nonleptonic Decays of Bottom and Charm Baryons in a Relativistic Three-Quark Model: Evaluation of Nonfactorizing Diagrams
• Direct observation of the strange b baryon Xi_b^{-}
• Charmless Three-Body Baryonic B Decays
• Evaluating decay Rates and Asymmetries of ${\Lambda }_b$ into Light Baryons in LFQM
• Polarization effects in the cascade decay Lambda_b -> Lambda(-> p pi-) + J/psi(-> l+ l-) in the covariant confined quark model
• Implications of Recent Measurements of Hadronic Charmless B Decays
• Direct CP violation in ${\Lambda }_b$ decays
• Precision measurement of the mass and lifetime of the ${\Xi }_b^0$ baryon
• Λ_b \to ΛJ/ψdecay in perturbative QCD
• Three-body Baryonic anti-B -->Lambda anti-p pi Decays and Such
• Studies of beauty baryon decays to $D^{0}p{h}^{-}$ and ${\Lambda }_c^{+}{h}^{-}$ final states
• Study of beauty hadron decays into pairs of charm hadrons
• Precision measurement of the mass and lifetime of the Xi_b^- baryon
• Measurement of Ratios of Fragmentation Fractions for Bottom Hadrons in p-pbar Collisions at sqrt{s}=1.96 TeV
• Two body non-leptonic ${\Lambda }_b$ decays in quark model with factorization ansatz
• Charmful Three-body Baryonic B decays
• Measurement of the Lambda_b^0 Decay Form Factor
• Violation of PCAC and two-body baryonic $B$ and $D_s$ decays
• A measurement of the branching fractions of the b-quark into charged and neutral b-hadrons

Cited by in corpus (19)

• An updated review of the new hadron states
• Observation of a new ${\Xi }_b^{-}$ resonance
• Anti-triplet charmed baryon decays with SU(3) Flavor Symmetry
• Production of $P_{cs}(4459)$ from ${\Xi }_b$ decay
• Sum rules for $CP$ asymmetries of charmed baryon decays in the $SU(3{)}_F$ limit
• Measurement of the mass and production rate of ${\Xi }_b^{-}$ baryons
• Charmless two-body anti-triplet $b$-baryon decays
• Production of $P_c$ states in ${\Lambda }_b$ decays
• SU(3)${}_F$ Analysis for Beauty Baryon Decays
• Fragmentation-fraction ratio $f_{{\Xi }_b}/f_{{\Lambda }_b}$ in $b$- and $c$-baryon decays
• Charmful two-body anti-triplet $b$-baryon decays
• Search for a $D\bar{D}$ bound state in the ${\Lambda }_b\to \Lambda D\bar{D}$ process
• Four-body baryonic decays of $B\to p\bar{p}{\pi }^{+}{\pi }^{-}({\pi }^{+}{K}^{-})$ and $\Lambda \bar{p}{\pi }^{+}{\pi }^{-}(K^{+}{K}^{-})$
• Direct CP violation in internal W-emission dominated baryonic B decays
• Charmonium decays of beauty baryons in the perturbative QCD approach
• Radiative $b$-baryon decays to measure the photon and $b$-baryon polarization
• Determinations of $|V_{cb}|$ and $|V_{ub}|$ from baryonic ${\Lambda }_b$ decays
• Exploring the simplest purely baryonic decay processes
• Charmful two-body ${\Omega }_b$ decays in the light-front quark model