Phenomenology of Λ b → Λ c τ ν ¯ τ $$ {\Lambda}_b\to {\Lambda}_c\tau {\overline{\nu}}_{\tau } $$ using lattice QCD calculations
Abstract 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 $$ {\Lambda}_b\to {\Lambda}_c\tau {\overline{\nu}}_{\tau } $$ decay. This decay is of interest in light of the R(D (*)) puzzle in the semileptonic B ¯ → D...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2017-08-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | http://link.springer.com/article/10.1007/JHEP08(2017)131 |
| _version_ | 1819013572844322816 |
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| author | Alakabha Datta Saeed Kamali Stefan Meinel Ahmed Rashed |
| author_facet | Alakabha Datta Saeed Kamali Stefan Meinel Ahmed Rashed |
| author_sort | Alakabha Datta |
| collection | DOAJ |
| description | Abstract 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 $$ {\Lambda}_b\to {\Lambda}_c\tau {\overline{\nu}}_{\tau } $$ decay. This decay is of interest in light of the R(D (*)) puzzle in the semileptonic B ¯ → D ∗ τ ν ¯ τ $$ \overline{B}\to {D}^{\left(\ast \right)}\tau {\overline{\nu}}_{\tau } $$ 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 $$ R\left({\Lambda}_c\right)=\mathrm{\mathcal{B}}\left[{\Lambda}_b\to {\Lambda}_c\tau {\overline{\nu}}_{\tau}\right]/\mathrm{\mathcal{B}}\left[{\Lambda}_b\to {\Lambda}_c\ell {\overline{\nu}}_{\ell}\right] $$ 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 $$ {\Lambda}_b\to {\Lambda}_c\tau {\overline{\nu}}_{\tau } $$ 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. |
| first_indexed | 2024-12-21T02:02:05Z |
| format | Article |
| id | doaj.art-040d8d17484f4bc3ab1daf31544aa94e |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-12-21T02:02:05Z |
| publishDate | 2017-08-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-040d8d17484f4bc3ab1daf31544aa94e2022-12-21T19:19:36ZengSpringerOpenJournal of High Energy Physics1029-84792017-08-012017813910.1007/JHEP08(2017)131Phenomenology of Λ b → Λ c τ ν ¯ τ $$ {\Lambda}_b\to {\Lambda}_c\tau {\overline{\nu}}_{\tau } $$ using lattice QCD calculationsAlakabha Datta0Saeed Kamali1Stefan Meinel2Ahmed Rashed3Department of Physics and Astronomy, University of MississippiDepartment of Physics and Astronomy, University of MississippiDepartment of Physics, University of ArizonaDepartment of Physics and Astronomy, University of MississippiAbstract 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 $$ {\Lambda}_b\to {\Lambda}_c\tau {\overline{\nu}}_{\tau } $$ decay. This decay is of interest in light of the R(D (*)) puzzle in the semileptonic B ¯ → D ∗ τ ν ¯ τ $$ \overline{B}\to {D}^{\left(\ast \right)}\tau {\overline{\nu}}_{\tau } $$ 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 $$ R\left({\Lambda}_c\right)=\mathrm{\mathcal{B}}\left[{\Lambda}_b\to {\Lambda}_c\tau {\overline{\nu}}_{\tau}\right]/\mathrm{\mathcal{B}}\left[{\Lambda}_b\to {\Lambda}_c\ell {\overline{\nu}}_{\ell}\right] $$ 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 $$ {\Lambda}_b\to {\Lambda}_c\tau {\overline{\nu}}_{\tau } $$ 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.http://link.springer.com/article/10.1007/JHEP08(2017)131Beyond Standard ModelHeavy Quark PhysicsLattice QCD |
| spellingShingle | Alakabha Datta Saeed Kamali Stefan Meinel Ahmed Rashed Phenomenology of Λ b → Λ c τ ν ¯ τ $$ {\Lambda}_b\to {\Lambda}_c\tau {\overline{\nu}}_{\tau } $$ using lattice QCD calculations Journal of High Energy Physics Beyond Standard Model Heavy Quark Physics Lattice QCD |
| title | Phenomenology of Λ b → Λ c τ ν ¯ τ $$ {\Lambda}_b\to {\Lambda}_c\tau {\overline{\nu}}_{\tau } $$ using lattice QCD calculations |
| title_full | Phenomenology of Λ b → Λ c τ ν ¯ τ $$ {\Lambda}_b\to {\Lambda}_c\tau {\overline{\nu}}_{\tau } $$ using lattice QCD calculations |
| title_fullStr | Phenomenology of Λ b → Λ c τ ν ¯ τ $$ {\Lambda}_b\to {\Lambda}_c\tau {\overline{\nu}}_{\tau } $$ using lattice QCD calculations |
| title_full_unstemmed | Phenomenology of Λ b → Λ c τ ν ¯ τ $$ {\Lambda}_b\to {\Lambda}_c\tau {\overline{\nu}}_{\tau } $$ using lattice QCD calculations |
| title_short | Phenomenology of Λ b → Λ c τ ν ¯ τ $$ {\Lambda}_b\to {\Lambda}_c\tau {\overline{\nu}}_{\tau } $$ using lattice QCD calculations |
| title_sort | phenomenology of λ b λ c τ ν ¯ τ lambda b to lambda c tau overline nu tau using lattice qcd calculations |
| topic | Beyond Standard Model Heavy Quark Physics Lattice QCD |
| url | http://link.springer.com/article/10.1007/JHEP08(2017)131 |
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