$R_K$ anomalies and simplified limits on $Z^{\prime }$ models at the LHC

Abstract

The LHCb collaboration has recently reported a 2.5 $\sigma$ discrepancy with respect to the predicted value in a test of lepton universality in the ratio $R_{K^{\ast }}=BR(B\to K^{\ast }{\mu }^{+}{\mu }^{-})/BR(B\to K^{\ast }{e}^{+}{e}^{-})$. Coupled with an earlier observation of a similar anomaly in $R_K$, this has generated significant excitement. A number of new physics scenarios have been proposed to explain the anomaly. In this work we consider simplified limits on $Z^{\prime }$ models from ATLAS and CMS searches for new resonances in dilepton and dijet modes, and we use the simplified limits variable $\zeta$ to correlate the results of the resonance and B-decay experiments. By examining minimal $Z^{\prime }$ models that can accomodate the observed LHCb results, we show that the high-mass resonance search results are begining to be sensitive to these models and that future results will be more informative.

arXiv comment24 pages, 5 figures. Typo corrected, resulting in strengthened limits. Additional references added; minor corrections found in referee process included

References in corpus (49)

• New Generation of Parton Distributions with Uncertainties from Global QCD Analysis
• Test of lepton universality using $B^{+}\to K^{+}{\ell }^{+}{\ell }^{-}$ decays
• Measurement of form-factor independent observables in the decay $B^0\to K^{\ast 0}{\mu }^{+}{\mu }^{-}$
• Systematic approach to exclusive B ->V l^+l^-, V gamma decays
• $B\to V{\ell }^{+}{\ell }^{-}$ in the Standard Model from Light-Cone Sum Rules
• Angular analysis of the $B^0\to K^{\ast 0}{\mu }^{+}{\mu }^{-}$ decay using $3\,\mbox{fb}^{-1}$ of integrated luminosity
• More Model-Independent Analysis of b->s Processes
• On the Standard Model predictions for $R_K$ and $R_{K^{\ast }}$
• Charm-loop effect in $B\to K^{(\ast )}{\ell }^{+}{\ell }^{-}$ and $B\to K^{\ast }\gamma$
• Explaining $h\to {\mu }^{\pm }{\tau }^{\mp }$, $B\to K^{\ast }{\mu }^{+}{\mu }^{-}$ and $B\to K{\mu }^{+}{\mu }^{-}/B\to K{e}^{+}{e}^{-}$ in a two-Higgs-doublet model with gauged $L_{\mu }-L_{\tau }$
• Search for high-mass dilepton resonances in pp collisions at sqrt(s) = 8 TeV with the ATLAS detector
• Global analysis of $b\to s\ell \ell$ anomalies
• Search for new phenomena in the dijet mass distribution using $p-p$ collision data at $\sqrt{s}=8$ TeV with the ATLAS detector
• Flavour anomalies after the $R_{K^{\ast }}$ measurement
• Simultaneous Explanation of the $R_K$ and $R(D^{(\ast )})$ Puzzles
• Lepton Flavor Violation in B Decays?
• Interpreting Hints for Lepton Flavor Universality Violation
• On B -> V l l at small dilepton invariant mass, power corrections, and new physics
• High-$p_T$ dilepton tails and flavour physics
• Explaining Dark Matter and $B$ Decay Anomalies with an $L_{\mu }-L_{\tau }$ Model
• On the impact of power corrections in the prediction of B->K*mu+mu- observables
• Lepton-flavour violating $B$ decays in generic $Z^{\prime }$ models
• Comprehensive Bayesian Analysis of Rare (Semi)leptonic and Radiative B Decays
• Exclusive rare B -> K*e+e- decays at low recoil: controlling the long-distance effects
• $R_K$ and $R_{K^{\ast }}$ beyond the Standard Model
• $B\to K{\ell }^{+}{\ell }^{-}$ decay at large hadronic recoil
• Theory of B -> K(*)l+l- decays at high q^2: OPE and quark-hadron duality
• Reassessing the discovery potential of the $B\to K^{\ast }{\ell }^{+}{\ell }^{-}$ decays in the large-recoil region: SM challenges and BSM opportunities
• On the anomalies in the latest LHCb data
• Simultaneous Explanation of the $R_K$ and $R_{D^{(\ast )}}$ Puzzles: a Model Analysis
• A Dark Matter Relic From Muon Anomalies
• Calculation of $B^0\to K^{\ast 0}{\mu }^{+}{\mu }^{-}$ and $B_s^0\to \varphi {\mu }^{+}{\mu }^{-}$ observables using form factors from lattice QCD
• Status of the $B\to K^{\ast }{\mu }^{+}{\mu }^{-}$ anomaly after Moriond 2017
• New observables in the decay mode anti-B --> anti-K*0 l+ l-
• Lepton Flavor Non-Universality in B decays from Dynamical Yukawas
• Z' models for the LHCb and g-2 muon anomalies
• Gauge-invariant implications of the LHCb measurements on Lepton-Flavour Non-Universality
• A leptoquark model to accommodate $R_K^{\exp }<R_K^{\mathrm{SM}}$ and $R_{K^{\ast }}^{\exp }<R_{K^{\ast }}^{\mathrm{SM}}$
• Lepton flavor universality violation without new sources of quark flavor violation
• Minimal flavor-changing $Z^{\prime }$ models and muon $g-2$ after the $R_{K^{\ast }}$ measurement
• Hadronic uncertainties in $B\to K^{\ast }{\mu }^{+}{\mu }^{-}$: a state-of-the-art analysis
• Measurement of the double-differential high-mass Drell-Yan cross section in pp collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector
• New Physics in $b\to s{\mu }^{+}{\mu }^{-}$: Distinguishing Models through CP-Violating Effects
• Large hadronic power corrections or new physics in the rare decay B-->K* mu+ mu- ?
• Search for contact interactions and large extra dimensions in the dilepton channel using proton-proton collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector
• LHCb anomalies from a natural perspective
• Flavor Non-universality Gauge Interactions and Anomalies in B-Meson Decays
• On Light Resonance Interpretations of the B Decay Anomalies
• Simplified Limits on Resonances at the LHC

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• $B$ decay anomalies and dark matter from vectorlike confinement
• Flavourful $Z^{\prime }$ portal for vector-like neutrino Dark Matter and $R_{K^{(\ast )}}$
• Collider Constraints on $Z^{\prime }$ Models for Neutral Current $B-$Anomalies
• Naturalising the Third Family Hypercharge Model for Neutral Current $B-$Anomalies
• $R_K$ and $R_{K^{\ast }}$ in an Aligned 2HDM with Right-Handed Neutrinos
• Connecting $b\to s\ell \bar{\ell }$ anomalies to enhanced rare nonleptonic ${\bar{B}}_s^0$ decays in $Z^{\prime }$ model
• Searching for New Physics with $b\bar{b}{\ell }^{+}{\ell }^{-}$ Contact Interactions
• Identifying a $Z^{\prime }$ behind $b\to s\ell \ell$ anomalies at the LHC
• Associated $Z^{\prime }$ production in the flavorful $U(1)$ scenario for $R_{K^{(\ast )}}$
• Studies of Lepton Flavor Violation at the LHC
• Broadening the Reach of Simplified Limits on Resonances at the LHC
• High $p_T$ correlated tests of lepton universality in lepton(s) + jet(s) processes; an EFT analysis
• Search for the vectorlike leptons in the U(1)${}_X$ model inspired by the $B$-meson decay anomalies
• Rare nonleptonic ${\bar{B}}_s^0$ decays as probes of new physics behind $b\to s\mu \bar{\mu }$ anomalies
• Model-independent analysis on $R(K^{(\ast )})$
• Dark Matter phenomenology : from simplified WIMP models to refined alternative solutions
• Testing spin-2 mediator by angular observables in $b\to s{\mu }^{+}{\mu }^{-}$
• $R(K^{(\ast )})$ with vector unparticles