New physics searches via angular distributions of B ¯ → D ∗ → Dπ τ → ℓ ν τ ν ¯ ℓ ν ¯ τ $$ \overline{B}\to {D}^{\ast}\left(\to D\pi \right)\tau \left(\to \ell {\nu}_{\tau }{\overline{\nu}}_{\ell}\right){\overline{\nu}}_{\tau } $$ decays
Abstract The study of B ¯ → D ∗ τ ν ¯ τ $$ \overline{B}\to {D}^{\ast}\tau {\overline{\nu}}_{\tau } $$ angular distribution can be used to obtain information about new physics (or beyond the Standard Model) couplings, which are motivated by various B anomalies. However, the inability to measure preci...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2025-04-01
|
| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP04(2025)135 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1849311561674391552 |
|---|---|
| author | Bhubanjyoti Bhattacharya Thomas E. Browder Alakabha Datta Tejhas Kapoor Emi Kou Lopamudra Mukherjee |
| author_facet | Bhubanjyoti Bhattacharya Thomas E. Browder Alakabha Datta Tejhas Kapoor Emi Kou Lopamudra Mukherjee |
| author_sort | Bhubanjyoti Bhattacharya |
| collection | DOAJ |
| description | Abstract The study of B ¯ → D ∗ τ ν ¯ τ $$ \overline{B}\to {D}^{\ast}\tau {\overline{\nu}}_{\tau } $$ angular distribution can be used to obtain information about new physics (or beyond the Standard Model) couplings, which are motivated by various B anomalies. However, the inability to measure precisely the three-momentum of the τ lepton hinders such measurements, as the tau decay contains one or more undetected neutrinos. Here, we present a measurable angular distribution of B ¯ → D ∗ τ ν ¯ τ $$ \overline{B}\to {D}^{\ast}\tau {\overline{\nu}}_{\tau } $$ by considering the additional decay τ → ℓ ν τ ν ¯ ℓ $$ \tau \to \ell {\nu}_{\tau }{\overline{\nu}}_{\ell } $$ , where ℓ ∈ {e, μ}. The full process used is B ¯ → D ∗ → Dπ τ → ℓ ν τ ν ¯ ℓ ν ¯ τ $$ \overline{B}\to {D}^{\ast}\left(\to D\pi \right)\tau \left(\to \ell {\nu}_{\tau }{\overline{\nu}}_{\ell}\right){\overline{\nu}}_{\tau } $$ , in which only the ℓ and D * are reconstructed. A fit to the experimental angular distribution of this process can be used to extract information on new physics parameters. To demonstrate the feasibility of this approach, we generate simulated data for this process and perform a sensitivity study to obtain the expected statistical errors on new physics parameters from experiments in the near future. We obtain a sensitivity of the order of 5% for the right-handed current and around 6% for the tensor current. In addition, we use the recent lattice QCD data on B → D * form factors and obtain correlations between form factors and new physics parameters. |
| format | Article |
| id | doaj-art-93caac64add2437aa8aa08f62c054bf1 |
| institution | Kabale University |
| issn | 1029-8479 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj-art-93caac64add2437aa8aa08f62c054bf12025-08-20T03:53:22ZengSpringerOpenJournal of High Energy Physics1029-84792025-04-012025413710.1007/JHEP04(2025)135New physics searches via angular distributions of B ¯ → D ∗ → Dπ τ → ℓ ν τ ν ¯ ℓ ν ¯ τ $$ \overline{B}\to {D}^{\ast}\left(\to D\pi \right)\tau \left(\to \ell {\nu}_{\tau }{\overline{\nu}}_{\ell}\right){\overline{\nu}}_{\tau } $$ decaysBhubanjyoti Bhattacharya0Thomas E. Browder1Alakabha Datta2Tejhas Kapoor3Emi Kou4Lopamudra Mukherjee5Department of Natural Sciences, Lawrence Technological UniversityDepartment of Physics and Astronomy, University of HawaiiDepartment of Physics and Astronomy, University of MississippiUniversité Paris-Saclay, CNRS/IN2P3, IJCLabUniversité Paris-Saclay, CNRS/IN2P3, IJCLabSchool of Physics, Nankai UniversityAbstract The study of B ¯ → D ∗ τ ν ¯ τ $$ \overline{B}\to {D}^{\ast}\tau {\overline{\nu}}_{\tau } $$ angular distribution can be used to obtain information about new physics (or beyond the Standard Model) couplings, which are motivated by various B anomalies. However, the inability to measure precisely the three-momentum of the τ lepton hinders such measurements, as the tau decay contains one or more undetected neutrinos. Here, we present a measurable angular distribution of B ¯ → D ∗ τ ν ¯ τ $$ \overline{B}\to {D}^{\ast}\tau {\overline{\nu}}_{\tau } $$ by considering the additional decay τ → ℓ ν τ ν ¯ ℓ $$ \tau \to \ell {\nu}_{\tau }{\overline{\nu}}_{\ell } $$ , where ℓ ∈ {e, μ}. The full process used is B ¯ → D ∗ → Dπ τ → ℓ ν τ ν ¯ ℓ ν ¯ τ $$ \overline{B}\to {D}^{\ast}\left(\to D\pi \right)\tau \left(\to \ell {\nu}_{\tau }{\overline{\nu}}_{\ell}\right){\overline{\nu}}_{\tau } $$ , in which only the ℓ and D * are reconstructed. A fit to the experimental angular distribution of this process can be used to extract information on new physics parameters. To demonstrate the feasibility of this approach, we generate simulated data for this process and perform a sensitivity study to obtain the expected statistical errors on new physics parameters from experiments in the near future. We obtain a sensitivity of the order of 5% for the right-handed current and around 6% for the tensor current. In addition, we use the recent lattice QCD data on B → D * form factors and obtain correlations between form factors and new physics parameters.https://doi.org/10.1007/JHEP04(2025)135Bottom QuarksSemi-Leptonic DecaysCKM Parameters |
| spellingShingle | Bhubanjyoti Bhattacharya Thomas E. Browder Alakabha Datta Tejhas Kapoor Emi Kou Lopamudra Mukherjee New physics searches via angular distributions of B ¯ → D ∗ → Dπ τ → ℓ ν τ ν ¯ ℓ ν ¯ τ $$ \overline{B}\to {D}^{\ast}\left(\to D\pi \right)\tau \left(\to \ell {\nu}_{\tau }{\overline{\nu}}_{\ell}\right){\overline{\nu}}_{\tau } $$ decays Journal of High Energy Physics Bottom Quarks Semi-Leptonic Decays CKM Parameters |
| title | New physics searches via angular distributions of B ¯ → D ∗ → Dπ τ → ℓ ν τ ν ¯ ℓ ν ¯ τ $$ \overline{B}\to {D}^{\ast}\left(\to D\pi \right)\tau \left(\to \ell {\nu}_{\tau }{\overline{\nu}}_{\ell}\right){\overline{\nu}}_{\tau } $$ decays |
| title_full | New physics searches via angular distributions of B ¯ → D ∗ → Dπ τ → ℓ ν τ ν ¯ ℓ ν ¯ τ $$ \overline{B}\to {D}^{\ast}\left(\to D\pi \right)\tau \left(\to \ell {\nu}_{\tau }{\overline{\nu}}_{\ell}\right){\overline{\nu}}_{\tau } $$ decays |
| title_fullStr | New physics searches via angular distributions of B ¯ → D ∗ → Dπ τ → ℓ ν τ ν ¯ ℓ ν ¯ τ $$ \overline{B}\to {D}^{\ast}\left(\to D\pi \right)\tau \left(\to \ell {\nu}_{\tau }{\overline{\nu}}_{\ell}\right){\overline{\nu}}_{\tau } $$ decays |
| title_full_unstemmed | New physics searches via angular distributions of B ¯ → D ∗ → Dπ τ → ℓ ν τ ν ¯ ℓ ν ¯ τ $$ \overline{B}\to {D}^{\ast}\left(\to D\pi \right)\tau \left(\to \ell {\nu}_{\tau }{\overline{\nu}}_{\ell}\right){\overline{\nu}}_{\tau } $$ decays |
| title_short | New physics searches via angular distributions of B ¯ → D ∗ → Dπ τ → ℓ ν τ ν ¯ ℓ ν ¯ τ $$ \overline{B}\to {D}^{\ast}\left(\to D\pi \right)\tau \left(\to \ell {\nu}_{\tau }{\overline{\nu}}_{\ell}\right){\overline{\nu}}_{\tau } $$ decays |
| title_sort | new physics searches via angular distributions of b ¯ d ∗ dπ τ l ν τ ν ¯ l ν ¯ τ overline b to d ast left to d pi right tau left to ell nu tau overline nu ell right overline nu tau decays |
| topic | Bottom Quarks Semi-Leptonic Decays CKM Parameters |
| url | https://doi.org/10.1007/JHEP04(2025)135 |
| work_keys_str_mv | AT bhubanjyotibhattacharya newphysicssearchesviaangulardistributionsofbddptlntnlntoverlinebtodastlefttodpirighttaulefttoellnutauoverlinenuellrightoverlinenutaudecays AT thomasebrowder newphysicssearchesviaangulardistributionsofbddptlntnlntoverlinebtodastlefttodpirighttaulefttoellnutauoverlinenuellrightoverlinenutaudecays AT alakabhadatta newphysicssearchesviaangulardistributionsofbddptlntnlntoverlinebtodastlefttodpirighttaulefttoellnutauoverlinenuellrightoverlinenutaudecays AT tejhaskapoor newphysicssearchesviaangulardistributionsofbddptlntnlntoverlinebtodastlefttodpirighttaulefttoellnutauoverlinenuellrightoverlinenutaudecays AT emikou newphysicssearchesviaangulardistributionsofbddptlntnlntoverlinebtodastlefttodpirighttaulefttoellnutauoverlinenuellrightoverlinenutaudecays AT lopamudramukherjee newphysicssearchesviaangulardistributionsofbddptlntnlntoverlinebtodastlefttodpirighttaulefttoellnutauoverlinenuellrightoverlinenutaudecays |