Abstract
The angular distribution and differential branching fraction of the decay B +→ K + μ + μ − are studied with a dataset corresponding to 1.0fb−1 of integrated luminosity, collected by the LHCb experiment. The angular distribution is measured in bins of dimuon invariant mass squared and found to be consistent with Standard Model expectations. Integrating the differential branching fraction over the full dimuon invariant mass range yields a total branching fraction of \( \mathcal{B} \) (B + → K + μ + μ −) = (4.36 ± 0.15 ± 0.18) × 10−7. These measurements are the most precise to date of the B + → K + μ + μ − decay.
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A. Ali, P. Ball, L. Handoko and G. Hiller, A comparative study of the decays B → (K, K ∗)ℓ+ℓ− in standard model and supersymmetric theories, Phys. Rev. D 61 (2000) 074024 [hep-ph/9910221] [INSPIRE].
C. Bobeth, G. Hiller and G. Piranishvili, Angular distributions of \( \overline{B}\to K\overline{l}l \) decays,JHEP 12 (2007) 040 [arXiv:0709.4174] [INSPIRE].
LHCb collaboration, Differential branching fraction and angular analysis of the decay B 0 → K ∗0 μ + μ −, Phys. Rev. Lett. 108 (2012) 181806 [arXiv:1112.3515] [INSPIRE].
LHCb collaboration, Differential branching fraction and angular analysis of the B 0 → K ∗0 μ + μ − decay, LHCb-CONF-2012-008 (2012).
A.K. Alok, A. Dighe and S.U. Sankar, Large forward-backward asymmetry in B → Kμ + μ − from new physics tensor operators, Phys. Rev. D 78 (2008) 114025 [arXiv:0810.3779] [INSPIRE].
A. Khodjamirian, T. Mannel, A. Pivovarov and Y.-M. Wang, Charm-loop effect in B→K (∗)ℓ+ℓ− and B→K ∗γ,JHEP 09 (2010) 089[arXiv:1006.4945] [INSPIRE].
C. Bobeth, G. Hiller, D. van Dyk and C. Wacker, The decay B → Kl + l − at low hadronic recoil and model-independent ΔB = 1 constraints, JHEP 01 (2012) 107 [arXiv:1111.2558] [INSPIRE].
LHCb collaboration, Strong constraints on the rare decays B s → μ + μ − and B 0 → μ + μ −, Phys. Rev. Lett. 108 (2012) 231801 [arXiv:1203.4493] [INSPIRE].
CMS collaboration, Search for \( B_s^0\to {\mu^{+}}{\mu^{-}} \) and B 0 → μ + μ − decays, JHEP 04 (2012) 033 [arXiv:1203.3976] [INSPIRE].
F. Beaujean, C. Bobeth, D. van Dyk and C. Wacker, Bayesian fit of exclusive \( b\to s\overline{\ell}\ell \) decays: the standard model operator basis, JHEP 08 (2012) 030 [arXiv:1205.1838] [INSPIRE].
W. Altmannshofer and D.M. Straub, Cornering new physics in b → s transitions, JHEP 08 (2012) 121 [arXiv:1206.0273] [INSPIRE].
LHCb collaboration, Measurement of the isospin asymmetry in B → K (∗) μ + μ − decays, JHEP 07 (2012) 133 [arXiv:1205.3422] [INSPIRE].
LHCb collaboration, The LHCb detector at the LHC, 2008 JINST 3 S08005 [INSPIRE].
T. Sjöstrand, S. Mrenna and P.Z. Skands, PYTHIA 6.4 physics and manual, JHEP 05 (2006) 026 [hep-ph/0603175] [INSPIRE].
I. Belyaev et al., Handling of the generation of primary events in Gauss, the LHCb simulation framework, IEEE Nucl. Sci. Symp. Conf. Rec. (2010) 1155.
D. Lange, The EvtGen particle decay simulation package, Nucl. Instrum. Meth. A 462 (2001) 152 [INSPIRE].
P. Golonka and Z. Was, PHOTOS Monte Carlo: a precision tool for QED corrections in Z and W decays, Eur. Phys. J. C 45 (2006) 97 [hep-ph/0506026] [INSPIRE].
GEANT4 collaboration, J. Allison et al., GEANT4 developments and applications, IEEE Trans. Nucl. Sci. 53 (2006) 270.
GEANT4 collaboration, S. Agostinelli et al., GEANT4: a simulation toolkit, Nucl. Instrum. Meth. A 506 (2003) 250 [INSPIRE].
M. Clemencic et al., The LHCb simulation application, Gauss: design, evolution and experience, J. Phys Conf. Ser. 331 (2011) 032023.
V.V. Gligorov, A single track HLT1 trigger, LHCb-PUB-2011-003 (2011).
V.V. Gligorov, C. Thomas, and M. Williams, The HLT inclusive B triggers, LHCb-PUB-2011-016 (2011).
L. Breiman, J.H. Friedman, R.A. Olshen and C.J. Stone, Classification and regression trees, Wadsworth international group, Belmont, California U.S.A. (1984).
Y. Freund and R.E. Schapire, A decision-theoretic generalization of on-line learning and an application to boosting, J. Comp. Syst. Sci. 55 (1997) 119.
LHCb collaboration, RICH pattern recognition for LHCb, Nucl. Instrum. Meth. A 433 (1999) 257 [INSPIRE].
BABAR collaboration, B. Aubert et al., Evidence for direct CP-violation from Dalitz-plot analysis of B ± → K ±π∓π±, Phys. Rev. D 78 (2008) 012004 [arXiv:0803.4451] [INSPIRE].
LHCb collaboration, First observation of the decay B + → π+ μ + μ −, LHCb-PAPER-2012-020 (2012).
LHCb collaboration, First observation of B + → π+ μ + μ −, LHCb-CONF-2012-006 (2012).
T. Skwarnicki, A study of the radiative cascade transitions between the \( {\varUpsilon^{\prime }} \) and \( \varUpsilon \) resonances, Ph.D. thesis, Institute of Nuclear Physics, Krakow, Poland (1986) [INSPIRE].
Particle Data Group collaboration, J. Beringer et al., Review of particle physics, Phys. Rev. D 86 (2012) 010001 [INSPIRE].
C. Bobeth, G. Hiller and D. van Dyk, More benefits of semileptonic rare B decays at low recoil: CP-violation, JHEP 07 (2011) 067 [arXiv:1105.0376] [INSPIRE].
M. Beneke, T. Feldmann and D. Seidel, Systematic approach to exclusive B → V ℓ+ℓ− , V γ decays, Nucl. Phys. B 612 (2001) 25 [hep-ph/0106067] [INSPIRE].
B. Grinstein and D. Pirjol, Exclusive rare B → K ∗ℓ+ℓ− decays at low recoil: controlling the long-distance effects, Phys. Rev. D 70 (2004) 114005 [hep-ph/0404250] [INSPIRE].
M. Beylich, G. Buchalla and T. Feldmann, Theory of B → K (∗)ℓ+ℓ− decays at high q 2 : OPE and quark-hadron duality, Eur. Phys. J. C 71 (2011) 1635 [arXiv:1101.5118] [INSPIRE].
U. Egede, T. Hurth, J. Matias, M. Ramon and W. Reece, New observables in the decay mode \( {{\overline{B}}_d}\to {{\overline{K}}^{*0 }}{\ell^{+}}{\ell^{-}} \), JHEP 11 (2008) 032[arXiv:0807.2589] [INSPIRE].
A. Ali, E. Lunghi, C. Greub and G. Hiller, Improved model independent analysis of semileptonic and radiative rare B decays, Phys. Rev. D 66 (2002) 034002 [hep-ph/0112300] [INSPIRE].
P. Ball and R. Zwicky, New results on B → π, K, η decay formfactors from light-cone sum rules, Phys. Rev. D 71 (2005) 014015 [hep-ph/0406232] [INSPIRE].
G.J. Feldman and R.D. Cousins, A unified approach to the classical statistical analysis of small signals, Phys. Rev. D 57 (1998) 3873 [physics/9711021] [INSPIRE].
BABAR collaboration, B. Aubert et al., Measurements of branching fractions, rate asymmetries and angular distributions in the rare decays B → Kℓ+ℓ− and B → K ∗ℓ+ℓ−, Phys. Rev. D 73 (2006) 092001 [hep-ex/0604007] [INSPIRE].
BABAR collaboration, J. Lees et al., Measurement of branching fractions and rate asymmetries in the rare decays B → K (∗) l + l −, Phys. Rev. D 86 (2012) 032012 [arXiv:1204.3933] [INSPIRE].
BELLE collaboration, J.-T. Wei et al., Measurement of the differential branching fraction and forward-backword asymmetry for B → K (∗)ℓ+ℓ−, Phys. Rev. Lett. 103 (2009) 171801 [arXiv:0904.0770] [INSPIRE].
CDF collaboration, T. Aaltonen et al., Measurements of the angular distributions in the decays B → K (∗) μ + μ − at CDF, Phys. Rev. Lett. 108 (2012) 081807 [arXiv:1108.0695] [INSPIRE].
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The LHCb collaboration., Aaij, R., Beteta, C.A. et al. Differential branching fraction and angular analysis of the B + → K + μ + μ − decay. J. High Energ. Phys. 2013, 105 (2013). https://doi.org/10.1007/JHEP02(2013)105
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DOI: https://doi.org/10.1007/JHEP02(2013)105