Lepton-flavour non-universality of $${\bar{B}}\rightarrow D^*\ell {{\bar{\nu }}}$$ B ¯ → D ∗ ℓ ν ¯ angular distributions in and beyond the Standard Model
Abstract We analyze in detail the angular distributions in $${\bar{B}}\rightarrow D^*\ell {{\bar{\nu }}}$$ B ¯ → D ∗ ℓ ν ¯ decays, with a focus on lepton-flavour non-universality. We investigate the minimal number of angular observables that fully describes current and upcoming datasets, and explore...
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2021
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oai:doaj.org-article:4e09a116316048e2a92bd4877cb10be62021-11-14T12:13:44ZLepton-flavour non-universality of $${\bar{B}}\rightarrow D^*\ell {{\bar{\nu }}}$$ B ¯ → D ∗ ℓ ν ¯ angular distributions in and beyond the Standard Model10.1140/epjc/s10052-021-09724-21434-60441434-6052https://doaj.org/article/4e09a116316048e2a92bd4877cb10be62021-11-01T00:00:00Zhttps://doi.org/10.1140/epjc/s10052-021-09724-2https://doaj.org/toc/1434-6044https://doaj.org/toc/1434-6052Abstract We analyze in detail the angular distributions in $${\bar{B}}\rightarrow D^*\ell {{\bar{\nu }}}$$ B ¯ → D ∗ ℓ ν ¯ decays, with a focus on lepton-flavour non-universality. We investigate the minimal number of angular observables that fully describes current and upcoming datasets, and explore their sensitivity to physics beyond the Standard Model (BSM) in the most general weak effective theory. We apply our findings to the current datasets, extract the non-redundant set of angular observables from the data, and compare to precise SM predictions that include lepton-flavour universality violating mass effects. Our analysis shows that the number of independent angular observables that can be inferred from current experimental data is limited to only four. These are insufficient to extract the full set of relevant BSM parameters. We uncover a $$\sim 4\sigma $$ ∼ 4 σ tension between data and predictions that is hidden in the redundant presentation of the Belle 2018 data on $${\bar{B}}\rightarrow D^*\ell {{\bar{\nu }}}$$ B ¯ → D ∗ ℓ ν ¯ decays. This tension specifically involves observables that probe $$e-\mu $$ e - μ lepton-flavour universality. However, we find inconsistencies in these data, which renders results based on it suspicious. Nevertheless, we discuss which generic BSM scenarios could explain the tension, in the case that the inconsistencies do not affect the data materially. Our findings highlight that $$e-\mu $$ e - μ non-universality in the SM, introduced by the finite muon mass, is already significant in a subset of angular observables with respect to the experimental precision.Christoph BobethMarzia BordoneNico GubernariMartin JungDanny van DykSpringerOpenarticleAstrophysicsQB460-466Nuclear and particle physics. Atomic energy. RadioactivityQC770-798ENEuropean Physical Journal C: Particles and Fields, Vol 81, Iss 11, Pp 1-18 (2021) |
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DOAJ |
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DOAJ |
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EN |
| topic |
Astrophysics QB460-466 Nuclear and particle physics. Atomic energy. Radioactivity QC770-798 |
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Astrophysics QB460-466 Nuclear and particle physics. Atomic energy. Radioactivity QC770-798 Christoph Bobeth Marzia Bordone Nico Gubernari Martin Jung Danny van Dyk Lepton-flavour non-universality of $${\bar{B}}\rightarrow D^*\ell {{\bar{\nu }}}$$ B ¯ → D ∗ ℓ ν ¯ angular distributions in and beyond the Standard Model |
| description |
Abstract We analyze in detail the angular distributions in $${\bar{B}}\rightarrow D^*\ell {{\bar{\nu }}}$$ B ¯ → D ∗ ℓ ν ¯ decays, with a focus on lepton-flavour non-universality. We investigate the minimal number of angular observables that fully describes current and upcoming datasets, and explore their sensitivity to physics beyond the Standard Model (BSM) in the most general weak effective theory. We apply our findings to the current datasets, extract the non-redundant set of angular observables from the data, and compare to precise SM predictions that include lepton-flavour universality violating mass effects. Our analysis shows that the number of independent angular observables that can be inferred from current experimental data is limited to only four. These are insufficient to extract the full set of relevant BSM parameters. We uncover a $$\sim 4\sigma $$ ∼ 4 σ tension between data and predictions that is hidden in the redundant presentation of the Belle 2018 data on $${\bar{B}}\rightarrow D^*\ell {{\bar{\nu }}}$$ B ¯ → D ∗ ℓ ν ¯ decays. This tension specifically involves observables that probe $$e-\mu $$ e - μ lepton-flavour universality. However, we find inconsistencies in these data, which renders results based on it suspicious. Nevertheless, we discuss which generic BSM scenarios could explain the tension, in the case that the inconsistencies do not affect the data materially. Our findings highlight that $$e-\mu $$ e - μ non-universality in the SM, introduced by the finite muon mass, is already significant in a subset of angular observables with respect to the experimental precision. |
| format |
article |
| author |
Christoph Bobeth Marzia Bordone Nico Gubernari Martin Jung Danny van Dyk |
| author_facet |
Christoph Bobeth Marzia Bordone Nico Gubernari Martin Jung Danny van Dyk |
| author_sort |
Christoph Bobeth |
| title |
Lepton-flavour non-universality of $${\bar{B}}\rightarrow D^*\ell {{\bar{\nu }}}$$ B ¯ → D ∗ ℓ ν ¯ angular distributions in and beyond the Standard Model |
| title_short |
Lepton-flavour non-universality of $${\bar{B}}\rightarrow D^*\ell {{\bar{\nu }}}$$ B ¯ → D ∗ ℓ ν ¯ angular distributions in and beyond the Standard Model |
| title_full |
Lepton-flavour non-universality of $${\bar{B}}\rightarrow D^*\ell {{\bar{\nu }}}$$ B ¯ → D ∗ ℓ ν ¯ angular distributions in and beyond the Standard Model |
| title_fullStr |
Lepton-flavour non-universality of $${\bar{B}}\rightarrow D^*\ell {{\bar{\nu }}}$$ B ¯ → D ∗ ℓ ν ¯ angular distributions in and beyond the Standard Model |
| title_full_unstemmed |
Lepton-flavour non-universality of $${\bar{B}}\rightarrow D^*\ell {{\bar{\nu }}}$$ B ¯ → D ∗ ℓ ν ¯ angular distributions in and beyond the Standard Model |
| title_sort |
lepton-flavour non-universality of $${\bar{b}}\rightarrow d^*\ell {{\bar{\nu }}}$$ b ¯ → d ∗ ℓ ν ¯ angular distributions in and beyond the standard model |
| publisher |
SpringerOpen |
| publishDate |
2021 |
| url |
https://doaj.org/article/4e09a116316048e2a92bd4877cb10be6 |
| work_keys_str_mv |
AT christophbobeth leptonflavournonuniversalityofbarbrightarrowdellbarnubdlnangulardistributionsinandbeyondthestandardmodel AT marziabordone leptonflavournonuniversalityofbarbrightarrowdellbarnubdlnangulardistributionsinandbeyondthestandardmodel AT nicogubernari leptonflavournonuniversalityofbarbrightarrowdellbarnubdlnangulardistributionsinandbeyondthestandardmodel AT martinjung leptonflavournonuniversalityofbarbrightarrowdellbarnubdlnangulardistributionsinandbeyondthestandardmodel AT dannyvandyk leptonflavournonuniversalityofbarbrightarrowdellbarnubdlnangulardistributionsinandbeyondthestandardmodel |
| _version_ |
1718429344659931136 |