Abstract
In past years, several hints of lepton flavor universality (LFU) violation have emerged from the and data. More recently, the Belle Collaboration has reported the first measurement of the longitudinal polarization fraction in the decay. Motivated by this intriguing result, along with the recent measurements of and polarization, we present the study of decays in supersymmetry (SUSY) with -parity violation (RPV). We consider , , and modes and focus on the branching ratios, LFU ratios, forward-backward asymmetries, polarizations of daughter hadrons, and the lepton. The RPV SUSY was capable of explaining the anomalies at the level, after taking into account various flavor constraints. In the allowed parameter space, the differential branching fractions and LFU ratios are largely enhanced by the SUSY effects, especially in the large dilepton invariant mass region. Moreover, a lower bound 10−6 is obtained. These observables could provide testable signatures at the high-luminosity LHC and SuperKEKB, and correlate with direct searches for SUSY.
Highlights
In recent years, several interesting anomalies emerge in experimental data of semi-leptonic Bmeson decays
It can be seen that, the SUSY predictions for the branching fractions and the Lepton Flavour University (LFU) ratios in these two decays overlap with their 1σ SM range, they can be considerably enhanced by the R-parity violation (RPV) SUSY effects
Motivated by the recent measurements of PLD∗, we have investigated the RPV SUSY effects in b → cτ νtransitions
Summary
Several interesting anomalies emerge in experimental data of semi-leptonic Bmeson decays. For the Bc → J/ψτ νdecay, which is mediated by the same quark-level process as B → D(∗)τ ν, the recent measured ratio RJex/pψ = 0.71 ± 0.17 (stat.) ± 0.18 (syst.) at the LHCb [15] lies within about 2σ above the SM prediction RJSM/ψ = 0.248 ± 0.006 [16]. In this work, motivated by these recent experimental progresses, we study the RD(∗) anomalies in the Supersymmetry (SUSY) with R-parity violation (RPV) In this scenario, the downtype squarks interact with quarks and leptons via the RPV couplings.
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