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Title: Phenomenology of $$ {\Lambda}_b\to {\Lambda}_c\tau {\overline{\nu}}_{\tau } $$ using lattice QCD calculations

In a recent paper we studied the effect of new-physics 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 model-independent 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 ν ¯ ] 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.
Authors:
 [1] ;  [2] ;  [3] ;  [4]
  1. Univ. of Mississippi, Oxford, MS (United States). Dept. of Physics and Astronomy; Univ. of Hawaii, Honolulu, HI (United States). Dept. of Physics and Astronomy
  2. Univ. of Mississippi, Oxford, MS (United States). Dept. of Physics and Astronomy
  3. Univ. of Arizona, Tucson, AZ (United States). Dept. of Physics; Brookhaven National Lab. (BNL), Upton, NY (United States). RIKEN BNL Research Center
  4. 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:
AC02-05CH11231; PHY-1414345; PHY-1520996; OCI-1053575
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 1029-8479
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) (SC-21); 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 new-physics 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 model-independent 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}
}