Electroweak Penguin Decays of <i>b</i>-Flavored Hadrons

Egede, U.; Nishida, S.; Patel, M.; Schune, M. H.

doi:10.1146/annurev-nucl-102020-092535

Cited by 5 publications

(2 citation statements)

References 86 publications

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“…4 " (A purely left-handed coupling to muons realises the limit C 9 = −C 10 , which will be a prediction of the benchmark leptoquark model that we examine.) However, depending upon the treatment of the predictions of observables in the 'quarks' category, the different fits may or may not have a mild preference [30] for the new physics field to couple to right-handed di-muons in addition with a similar strength to JHEP04(2023)033 the coupling to left-handed di-muons (e.g. realising the limit where C 9 = 0 but C 10 = 0; this will be the prediction of the benchmark Z model which we shall choose) [31].…”

Section: Jhep04(2023)033mentioning

confidence: 99%

The Rumble in the Meson: a leptoquark versus a Z′ to fit b → sμ+μ− anomalies including 2022 LHCb $$ {R}_{K^{\left(\ast \right)}} $$ measurements

Allanach

Davighi

2023

J. High Energ. Phys.

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We juxtapose global fits of two bottom-up models (an S3 scalar leptoquark model and a B3 – L2Z′ model) of b → sμ+μ− anomalies to flavour data in order to quantify statistical preference or lack thereof. The leptoquark model couples directly to left-handed di-muon pairs, whereas the Z′ model couples to di-muon pairs with a vector-like coupling. $$ {B}_s-\overline{B_s} $$ B s − B s ¯ mixing is a focus because it is typically expected to disfavour Z′ explanations. In two-parameter fits to 247 flavour observables, including Bs/d→ μ+μ− branching ratios for which we provide an updated combination and LHCb $$ {R}_{K^{\left(\ast \right)}} $$ R K ∗ measurements from December 2022, we show that each model provides a similar improvement in quality-of-fit of $$ \sqrt{\Delta {\chi}^2} $$ ∆ χ 2 = 3.6 with respect to the Standard Model. The main effect of the $$ {B}_s-\overline{B_s} $$ B s − B s ¯ mixing constraint in the Z′ model is to disfavour values of the sL– bL mixing angle greater than about 5|Vcb|. This limit is rather loose, meaning that a good fit to data does not require ‘alignment’ in either quark Yukawa matrix. No curtailment of the sL− bL mixing angle is evident in the S3 model.

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Section: Jhep04(2023)033mentioning

confidence: 99%

The Rumble in the Meson: a leptoquark versus a Z′ to fit b → sμ+μ− anomalies including 2022 LHCb $$ {R}_{K^{\left(\ast \right)}} $$ measurements

Allanach

Davighi

2023

J. High Energ. Phys.

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“…, and ¢ P 5 and deviations in the branching ratios of some B or B s decays [6][7][8][9][10][11] in comparison to the SM expectations and call for further study of LFV.…”

Section: Introductionmentioning

confidence: 99%

Studying lepton flavor violating μ decays with vector leptoquark

Nayak,

Brahma,

Giri

2024

J. Phys. G: Nucl. Part. Phys.

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We study the charged LFV $\mu$ decays such as $\mu\rightarrow e\gamma$, $\mu \rightarrow eee$, and $(\mu - e)_{\text{Ti}}$ with a vector leptoquark ($U_3$) by considering the constraints from non-standard neutrino interaction (NSI) sector parameter $\epsilon_{e\mu}$. We consider that these NSIs are attributed to the presence of leptoquarks to account for the difference in the experimental observations of $\delta_{CP}$ measurement by NOvA and T2K ~\cite{nova,t2k}. In our study, we obtained the branching ratios with uncertainties for three decay modes:\begin{eqnarray*}\mathcal{B}(\mu \rightarrow e \gamma) \leq 4.6^{+3.8}_{-2.6} \times 10^{-18},\\ \mathcal{B}(\mu \rightarrow eee) \leq 9.57^{+7.43}_{-5.37} \times 10^{-21},\\\mathcal{B}(\mu \rightarrow e)_{\text{Ti}} \leq 6.89^{+5.61}_{-3.89} \times 10^{-19}.\end{eqnarray*}Our results show an improvement in the current limits, which can be explored in future experiments.

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