Phenomenology of $$ {\Lambda}_b\to {\Lambda}_c\tau {\overline{\nu}}_{\tau } $$ using lattice QCD calculations
In a recent paper we studied the effect of newphysics operators with different Lorentz structures on the semileptonic ${\mathrm{\Lambda}}_{b}\to {\mathrm{\Lambda}}_{c}\tau {\overline{\nu}}_{\tau}$ decay. This decay is of interest in light of the R(D (*)) puzzle in the semileptonic $\overline{B}\to {D}^{(\ast )}\tau {\overline{\nu}}_{\tau}$ decays. In this work we add tensor operators to extend our previous results and consider both modelindependent new physics (NP) and specific classes of models proposed to address the R(D (*)) puzzle. We show that a measurement of $R\left({\mathrm{\Lambda}}_{c}\right)=\mathcal{B}[{\mathrm{\Lambda}}_{b}\to {\mathrm{\Lambda}}_{c}\tau {\overline{\nu}}_{\tau}]/\mathcal{B}[{\mathrm{\Lambda}}_{b}\to {\mathrm{\Lambda}}_{c}\ell {\overline{\nu}}_{\ell}]$ can strongly constrain the NP parameters of models discussed for the R(D (*)) puzzle. We use form factors from lattice QCD to calculate all ${\mathrm{\Lambda}}_{b}\to {\mathrm{\Lambda}}_{c}\tau {\overline{\nu}}_{\tau}$ observables. The Λ _{b} → Λ _{c} tensor form factors had not previously been determined in lattice QCD, and we present new lattice results for these form factors here.
 Authors:

^{[1]};
^{[2]};
^{[3]};
^{[4]}
 Univ. of Mississippi, Oxford, MS (United States). Dept. of Physics and Astronomy; Univ. of Hawaii, Honolulu, HI (United States). Dept. of Physics and Astronomy
 Univ. of Mississippi, Oxford, MS (United States). Dept. of Physics and Astronomy
 Univ. of Arizona, Tucson, AZ (United States). Dept. of Physics; Brookhaven National Lab. (BNL), Upton, NY (United States). RIKEN BNL Research Center
 Univ. of Mississippi, Oxford, MS (United States). Dept. of Physics and Astronomy; Ain Shams Univ., Cairo (Egypt). Dept. of Physics
 Publication Date:
 Grant/Contract Number:
 AC0205CH11231; PHY1414345; PHY1520996; OCI1053575
 Type:
 Accepted Manuscript
 Journal Name:
 Journal of High Energy Physics (Online)
 Additional Journal Information:
 Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2017; Journal Issue: 8; Journal ID: ISSN 10298479
 Publisher:
 Springer Berlin
 Research Org:
 Univ. of Mississippi, Oxford, MS (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
 Sponsoring Org:
 USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR) (SC21); National Science Foundation (NSF)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Beyond Standard Model; heavy quark physics; lattice QCD
 OSTI Identifier:
 1461759
Datta, Alakabha, Kamali, Saeed, Meinel, Stefan, and Rashed, Ahmed. Phenomenology of $ {\Lambda}_b\to {\Lambda}_c\tau {\overline{\nu}}_{\tau } $ using lattice QCD calculations. United States: N. p.,
Web. doi:10.1007/JHEP08(2017)131.
Datta, Alakabha, Kamali, Saeed, Meinel, Stefan, & Rashed, Ahmed. Phenomenology of $ {\Lambda}_b\to {\Lambda}_c\tau {\overline{\nu}}_{\tau } $ using lattice QCD calculations. United States. doi:10.1007/JHEP08(2017)131.
Datta, Alakabha, Kamali, Saeed, Meinel, Stefan, and Rashed, Ahmed. 2017.
"Phenomenology of $ {\Lambda}_b\to {\Lambda}_c\tau {\overline{\nu}}_{\tau } $ using lattice QCD calculations". United States.
doi:10.1007/JHEP08(2017)131. https://www.osti.gov/servlets/purl/1461759.
@article{osti_1461759,
title = {Phenomenology of $ {\Lambda}_b\to {\Lambda}_c\tau {\overline{\nu}}_{\tau } $ using lattice QCD calculations},
author = {Datta, Alakabha and Kamali, Saeed and Meinel, Stefan and Rashed, Ahmed},
abstractNote = {In a recent paper we studied the effect of newphysics operators with different Lorentz structures on the semileptonic Λ b → Λ c τ ν ¯ τ decay. This decay is of interest in light of the R(D (*)) puzzle in the semileptonic B ¯ → D ( ∗ ) τ ν ¯ τ decays. In this work we add tensor operators to extend our previous results and consider both modelindependent new physics (NP) and specific classes of models proposed to address the R(D (*)) puzzle. We show that a measurement of R ( Λ c ) = B [ Λ b → Λ c τ ν ¯ τ ] / B [ Λ b → Λ c ℓ ν ¯ ℓ ] can strongly constrain the NP parameters of models discussed for the R(D (*)) puzzle. We use form factors from lattice QCD to calculate all Λ b → Λ c τ ν ¯ τ observables. The Λ b → Λ c tensor form factors had not previously been determined in lattice QCD, and we present new lattice results for these form factors here.},
doi = {10.1007/JHEP08(2017)131},
journal = {Journal of High Energy Physics (Online)},
number = 8,
volume = 2017,
place = {United States},
year = {2017},
month = {8}
}