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تسجيل مستخدم جديدSearching for New Physics with $B^{0} to K^{*0} mu^+ mu^-$
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One of the main indications for New Physics in rare $B$-decays is deduced from the tension between experimental and Standard Model predictions of the angular analysis of the $B^0 to K^{*0} mu^+mu^-$ decay. There are however possible non-local hadronic effects which in principle can also explain these tensions. In this work, we consider a statistical approach for differentiating the source of the tension in $B^0 to K^{*0} mu^+mu^-$ observables and we also investigate the prospects of such a comparison with future data from the LHCb experiment.
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We analyse the results recently presented on the $B^{+} to K^{*+} mu^+ mu^-$ angular observables by the LHCb Collaboration which show indications for New Physics beyond the Standard Model. Within a model-independent analysis, we compare the fit resul
ts with the corresponding results for the angular observables in $B^{0} to K^{*0} mu^+ mu^-$.
We perform an analysis within the Standard Model of $B^{0,+} to K^{*0,+} mu^+ mu^-$ decays in light of the recent measurements from the LHCb experiment, showing that new data strengthen the need for sizable hadronic contributions and correlations amo
ng them. We then extend our analysis to New Physics via the Standard Model Effective Theory, and carry out a state-of-the-art fit of available $b to s ell^+ ell^-$ data, including possible hadronic contributions. We find the case of a fully left-handed operator standing out as the simplest scenario with a significance of almost $6sigma$.
A search is presented for hidden-sector bosons, $chi$, produced in the decay ${B^0!to K^*(892)^0chi}$, with $K^*(892)^0!to K^{+}pi^{-}$ and $chi!tomu^+mu^-$. The search is performed using $pp$-collision data corresponding to 3.0 fb$^{-1}$ collected w
ith the LHCb detector. No significant signal is observed in the accessible mass range $214 leq m({chi}) leq 4350$ MeV, and upper limits are placed on the branching fraction product $mathcal{B}(B^0!to K^*(892)^0chi)timesmathcal{B}(chi!tomu^+mu^-)$ as a function of the mass and lifetime of the $chi$ boson. These limits are of the order of $10^{-9}$ for $chi$ lifetimes less than 100 ps over most of the $m(chi)$ range, and place the most stringent constraints to date on many theories that predict the existence of additional low-mass bosons.
The direct $C!P$ asymmetries of the decays $B^0 rightarrow K^{*0} mu^+ mu^-$ and $B^+ rightarrow K^{+} mu^+ mu^-$ are measured using $pp$ collision data corresponding to an integrated luminosity of 3.0$mbox{fb}^{-1}$ collected with the LHCb detector.
The respective control modes $B^0 rightarrow J/psi K^{*0}$ and $B^+ rightarrow J/psi K^{+}$ are used to account for detection and production asymmetries. The measurements are made in several intervals of $mu^+ mu^-$ invariant mass squared, with the $phi(1020)$ and charmonium resonance regions excluded. Under the hypothesis of zero $C!P$ asymmetry in the control modes, the average values of the asymmetries are begin{align} {cal A}_{C!P}(B^0 rightarrow K^{*0} mu^+ mu^-) &= -0.035 pm 0.024 pm 0.003, cr {cal A}_{C!P}(B^+ rightarrow K^{+} mu^+ mu^-) &= phantom{-}0.012 pm 0.017 pm 0.001, end{align} where the first uncertainties are statistical and the second are due to systematic effects. Both measurements are consistent with the Standard Model prediction of small $C!P$ asymmetry in these decays.
This talk discusses possible new physics interpretations of recent experimental results on the B-->K*mu+mu- decay that show a discrepancy with the Standard Model predictions. A model independent analysis that takes into account all the relevant obser
vables in B-->K*mu+mu- and in related b-->s transitions allows to identify a consistent new physics explanation of the discrepancy. An explicit realization in the context of a Z model is presented. The model is based on the U(1) gauge group associated with the difference between muon- and tau-lepton number, L_mu - L_tau.
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