Angular analysis of the $B^0\to K^{\ast 0}{\mu }^{+}{\mu }^{-}$ decay using $3\,\mbox{fb}^{-1}$ of integrated luminosity

Abstract

An angular analysis of the $B^0\to K^{\ast 0}(\to K^{+}{\pi }^{-}){\mu }^{+}{\mu }^{-}$ decay is presented. The dataset corresponds to an integrated luminosity of $3.0\,{\mbox{fb}^{-1}}$ of $pp$ collision data collected at the LHCb experiment. The complete angular information from the decay is used to determine $CP$-averaged observables and $CP$ asymmetries, taking account of possible contamination from decays with the $K^{+}{\pi }^{-}$ system in an S-wave configuration. The angular observables and their correlations are reported in bins of $q^2$, the invariant mass squared of the dimuon system. The observables are determined both from an unbinned maximum likelihood fit and by using the principal moments of the angular distribution. In addition, by fitting for $q^2$-dependent decay amplitudes in the region $1.1<q^2<6.0{\mathrm{Ge}\mathrm{V}}^2/c^4$, the zero-crossing points of several angular observables are computed. A global fit is performed to the complete set of $CP$-averaged observables obtained from the maximum likelihood fit. This fit indicates differences with predictions based on the Standard Model at the level of 3.4 standard deviations. These differences could be explained by contributions from physics beyond the Standard Model, or by an unexpectedly large hadronic effect that is not accounted for in the Standard Model predictions.

All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2015-051.html

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• $E_6$ Models in Light of Precision $M_W$ Measurements
• TeV-scale vector leptoquark from Pati-Salam unification with vectorlike families
• A search for rare $B\to D{\mu }^{+}{\mu }^{-}$ decays
• Assessing Lepton Flavor Universality Violations in Semileptonic Decays
• Angular analyses of exclusive $\overline{B}\to X_J{\ell }_1{\ell }_2$ decays for spin $J\le 4$
• Scrutinizing $B^0$-meson flavor changing neutral current decay into scalar $K_0^{\ast }(1430)$ meson with $b\to s{\ell }^{+}{\ell }^{-}(\nu \bar{\nu })$ transition
• New physics in $b\to s{e}^{+}{e}^{-}$: A model independent analysis
• Angular analysis of $\bar{B}\to D_2^{\ast }(\to D\pi )\ell \bar{\nu }$ decay and new physics
• ${\Lambda }_b\to \Lambda (\to p{\pi }^{-}){\ell }^{+}{\ell }^{-}$ as probe of CP-violating New Physics
• Implications of new physics in $B\to K_1{\mu }^{+}{\mu }^{-}$ decay processes
• Decay $B_c^{+}\to D_{(s)}^{(\ast )+}{\ell }^{+}{\ell }^{-}$ within covariant confined quark model
• Theoretical Review of Rare B Decays
• Probing new physics in $B\to D{\ell }^{+}{\ell }^{-}$ decays by using angular asymmetries
• Electroweak $t\bar{t}$ hadroproduction in the presence of heavy $Z^{\prime }$ and $W^{\prime }$ bosons at NLO QCD in POWHEG
• Recent progress in decays of $b$ and $c$ hadrons
• Tensions in the flavour sector
• Addressing the $R_{\tau /\mu ,e}\left(D^{(\ast )}\right)$ puzzle through New Physics four-fermion operators and their impact on ${\Lambda }_b\to {\Lambda }_c\tau {\bar{\nu }}_{\tau }$ decay
• Semileptonic neutral current decays of ${\Xi }_b$ with dileptons or dineutrinos in the final state
• New Physics in the Flavour Sector
• Heavy quark expansion of ${\Lambda }_b\to {\Lambda }^{\ast }(1520)$ form factors beyond leading order
• Probing new physics effects in ${\Lambda }_b\to \Lambda (\to p{\pi }^{-}){\ell }^{+}{\ell }^{-}$ decay via model independent approach
• Vacuum stability in an extended standard model with a leptoquark
• MoreFit: A More Optimised, Rapid and Efficient Fit
• Model-independent unbinned analysis of $B\to K^{\ast }(\to K^{+}{\pi }^{-}){\mu }^{+}{\mu }^{-}$: zeroes, bounds, Wilson coefficients and symmetries
• Probing mixed-state dark matter and flavor observables in a scalar-assisted baryonic gauge theory
• The Angular Observables of ${\Lambda }_b\to {\Lambda }_c(\to {\Lambda }^0{\pi }^{+}){\tau }^{-}(\to {\pi }^{-}{\nu }_{\tau }){\bar{\nu }}_{\tau }$ within the Paradigm of FCCC Anomalies
• Single-top production and rare top interactions
• Form factors and differential distributions in rare radiative leptonic B-decays
• Precise predictions for electroweak $t\bar{t}$ production at the LHC in models with flavour non-diagonal $Z^{\prime }$ boson couplings and $W^{\prime }$ bosons
• Recent results from the Belle experiment
• Non-parametric and continuous extraction of amplitudes in electroweak penguin decays
• $B_{(s)}\to S(a_0(1450),K_0^{\ast }(1430),f_0(1500))$ helicity form factors within QCD light-cone sum rules
• EOS -- A Software for Flavor Physics Phenomenology
• Summary of Working Group 5: Physics with Heavy Flavours
• Rare B, D and K decays, radiative and electroweak penguin decays, including constraints on $V_{td}/V_{ts}$ and ${\epsilon }^{\prime }/\epsilon$: Summary of CKM 2018 working group 3
• $B_s^{\ast }\to l^{+}{l}^{-}$ decays in light of recent $B$ anomalies