A search for B+ → Ds+K+K− decays is performed using pp collision data corresponding to an integrated luminosity of 4.8 fb−1, collected at centre-of-mass energies of 7, 8 and 13 TeV with the LHCb experiment. A significant signal is observed for the first time and the branching fraction is determined to be
where the first uncertainty is statistical, the second systematic and the third due to the uncertainty on the branching fraction of the normalisation mode \( {B}^{+}\to {D}_s^{+}{\overline{D}}^0 \). A search is also performed for the pure annihilation decay B+ → Ds+ϕ. No significant signal is observed and a limit of
This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.
References
[1]
BaBar collaboration, B. Aubert et al., Evidence for the Rare Decay\( {B}^{+}\to {D}_{{}^s}^{+}{\pi}^0 \), Phys. Rev. Lett.98 (2007) 171801 [hep-ex/0611030] [INSPIRE].
[2]
M. Gronau, D. London and J.L. Rosner, Rescattering Contributions to rare B-Meson Decays, Phys. Rev.D 87 (2013) 036008 [arXiv:1211.5785] [INSPIRE].ADSGoogle Scholar
[3]
H. Zou, R.-H. Li, X.-X. Wang and C.-D. Lu, The CKM suppressed\( B\left({B}_s\right)\to {\overline{D}}_{(s)}P,\ {\overline{D}}_{(s)}V,\ {\overline{D}}_{(s)}^{*}P,{\overline{D}}_{(s)}^{*}V \)decays in perturbative QCD approach, J. Phys.G 37 (2010) 015002 [arXiv:0908.1856] [INSPIRE].
[4]
R. Mohanta, Searching for new physics in the rare decay B+ → Ds + ϕ, Phys. Lett.B 540 (2002) 241 [hep-ph/0205297] [INSPIRE].
[5]
R. Mohanta and A.K. Giri, Possible signatures of unparticles in rare annihilation type B decays, Phys. Rev.D 76 (2007) 057701 [arXiv:0707.3308] [INSPIRE].ADSGoogle Scholar
[6]
C.-D. Lu, Calculation of pure annihilation type decay B+ → Ds+ϕ, Eur. Phys. J.C 24 (2002) 121 [hep-ph/0112127] [INSPIRE].
[7]
HPQCD collaboration, R.J. Dowdall et al., B-Meson Decay Constants from Improved Lattice Nonrelativistic QCD with Physical u, d, s and c Quarks, Phys. Rev. Lett.110 (2013) 222003 [arXiv:1302.2644] [INSPIRE].
[8]
ETM collaboration, A. Bussone et al., Mass of the b quark and B-meson decay constants from Nf = 2 + 1 + 1 twisted-mass lattice QCD, Phys. Rev.D 93 (2016) 114505 [arXiv:1603.04306] [INSPIRE].
[9]
Fermilab Lattice, MILC collaborations, A. Bazavov et al., B(s)0-mixing matrix elements from lattice QCD for the Standard Model and beyond, Phys. Rev.D 93 (2016) 113016 [arXiv:1602.03560] [INSPIRE].
[10]
LHCb collaboration, First evidence for the annihilation decay mode B+ → Ds+ϕ, JHEP02 (2013) 043 [arXiv:1210.1089] [INSPIRE].
[11]
Particle Data Group collaboration, C. Patrignani et al., Review of Particle Physics, Chin. Phys.C 40 (2016) 100001 [INSPIRE].
[12]
LHCb collaboration, The LHCb Detector at the LHC, 2008 JINST3 S08005 [INSPIRE].
V.V. Gligorov and M. Williams, Efficient, reliable and fast high-level triggering using a bonsai boosted decision tree, 2013 JINST8 P02013 [arXiv:1210.6861] [INSPIRE].
[15]
T. Sjöstrand, S. Mrenna and P.Z. Skands, A Brief Introduction to PYTHIA 8.1, Comput. Phys. Commun.178 (2008) 852 [arXiv:0710.3820] [INSPIRE].
[16]
T. Sjöstrand, S. Mrenna and P.Z. Skands, PYTHIA 6.4 Physics and Manual, JHEP05 (2006) 026 [hep-ph/0603175] [INSPIRE].
[17]
LHCb collaboration, Handling of the generation of primary events in Gauss, the LHCb simulation framework, J. Phys. Conf. Ser.331 (2011) 032047 [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].
[20]
Geant4 collaboration, J. Allison et al., Geant4 developments and applications, IEEE Trans. Nucl. Sci.53 (2006) 270.Google Scholar
[21]
Geant4 collaboration, S. Agostinelli et al., GEANT4: A simulation toolkit, Nucl. Instrum. Meth.A 506 (2003) 250 [INSPIRE].
[22]
M. Clemencic et al., The LHCb simulation application, Gauss: Design, evolution and experience, J. Phys. Conf. Ser.331 (2011) 032023 [INSPIRE].CrossRefGoogle Scholar
[23]
LHCb collaboration, First observations of\( {\overline{B}}_s^0\to {D}^{+}{D^{-}}^{,}{D}_{{}^s}^{+}{D}^{-} \) and \( {D}^0{\overline{D}}^0 \)decays, Phys. Rev.D 87 (2013) 092007 [arXiv:1302.5854] [INSPIRE].
[24]
M. Pivk and F.R. Le Diberder, SPlot: A statistical tool to unfold data distributions, Nucl. Instrum. Meth.A 555 (2005) 356 [physics/0402083] [INSPIRE].
[25]
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).Google Scholar
[26]
G. Punzi, Sensitivity of searches for new signals and its optimization, eConfC 030908 (2003) MODT002 [physics/0308063] [INSPIRE].
[27]
W.D. Hulsbergen, Decay chain fitting with a Kalman filter, Nucl. Instrum. Meth.A 552 (2005) 566 [physics/0503191] [INSPIRE].
[28]
T. Skwarnicki, A study of the radiative cascade transitions between the Upsilon-prime and Upsilon resonances, Ph.D. Thesis, Institute of Nuclear Physics, Krakow (1986) DESY-F31-86-02] [INSPIRE].
[29]
LHCb collaboration, Measurement of CP observables in B± → D(∗)K±and B± → D(∗)π±decays, Phys. Lett.B 777 (2018) 16 [arXiv:1708.06370] [INSPIRE].
[30]
LHCb collaboration, Model-independent measurement of the CKM angle γ using B0 → DK∗0decays with D → KS0π+π−and KS0K+K−, JHEP06 (2016) 131 [arXiv:1604.01525] [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].
[33]
B. Sen, M. Walker and M. Woodroofe, On the unified method with nuisance parameters, Statist. Sinica19 (2009) 301.MathSciNetzbMATHGoogle Scholar
