Prospects for improved ${\Lambda }_c$ branching fractions

Abstract

The experimental uncertainty on the branching fraction $\b(Λ_c \to p K^- π^+) = (5.0 \pm 1.3)%$ has not decreased since 1998, despite a much larger data sample. Uncertainty in this quantity dominates that in many other quantities, including branching fractions of ${\Lambda }_c$ to other modes, branching fractions of $b$-flavored baryons, and fragmentation fractions of charmed and bottom quarks. Here we advocate a lattice QCD calculation of the form factors in ${\Lambda }_c\to \Lambda {\ell }^{+}{\nu }_{\ell }$ (the case $\ell =e^{+}$ is simpler as the mass of the lepton can be neglected). Such a calculation would yield an absolute prediction for the rate for ${\Lambda }_c\to \Lambda {\ell }^{+}{\nu }_{\ell }$. When combined with the ${\Lambda }_c$ lifetime, it could provide a calibration for an improved set of ${\Lambda }_c$ branching fractions as long as the accuracy exceeds about 25%.

8 pages, 2 figures, version to be published in Phys.\ Rev.\ D

References in corpus (5)

• Measurement of b hadron production fractions in 7 TeV pp collisions
• Observation of the Baryonic Flavor-Changing Neutral Current Decay Lambda_b -> Lambda mu+ mu-
• Measurement of the anomalous like-sign dimuon charge asymmetry with 9 fb^-1 of p pbar collisions
• Semileptonic width ratios among beauty hadrons
• Ratios of heavy hadron semileptonic decay rates

Cited by in corpus (11)

• Measurements of absolute hadronic branching fractions of ${\Lambda }_c^{+}$ baryon
• Measurement of the absolute branching fraction for ${\Lambda }_c^{+}\to \Lambda e^{+}{\nu }_e$
• ${\Lambda }_c\to \Lambda {\ell }^{+}{\nu }_{\ell }$ form factors and decay rates from lattice QCD with physical quark masses
• Study of the Standard Model with weak decays of charmed hadrons at BESIII
• Semileptonic decays of ${\Lambda }_c$ baryons in the relativistic quark model
• Measurements of Absolute Branching Fractions for ${\Lambda }_c^{+}\to {\Xi }^0{K}^{+}$ and $\Xi (1530{)}^0{K}^{+}$
• Measurement of the absolute branching fraction of the inclusive semileptonic ${\Lambda }_c^{+}$ decay
• An overview of ${\Lambda }_c$ decays
• Measurement of the Decays ${\Lambda }_c\to \Sigma \pi \pi$ at Belle
• Improved measurement of the absolute branching fraction of inclusive semileptonic ${\Lambda }_c^{+}$ decay
• Measurement of branching fractions of ${\Lambda }_c^{+}$ decays to ${\Sigma }^{+}{K}^{+}{K}^{-}$, ${\Sigma }^{+}\varphi$ and ${\Sigma }^{+}{K}^{+}{\pi }^{-}({\pi }^0)$