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Title: First observations of the rare decays B (+) -> K (+)pi (+)pi (-)mu(+)mu (-) and B (+)-> phi K (+)mu(+)mu (-)
Author: Comerma-Montells, A.
Garrido Beltrán, Lluís
Graciani Díaz, Ricardo
Graugés Pous, Eugeni
Marin Benito, Carla
Picatoste Olloqui, E.
Rives Molina, V.
Ruiz, Hugo
LHCb Collaboration
Keywords: Hadrons
Gran Col·lisionador d'Hadrons
Física de partícules
Large Hadron Collider (France and Switzerland)
Particle physics
Issue Date: Oct-2014
Publisher: Springer Verlag
Abstract: First observations of the rare decays B+→ K+π +π −µ +µ − and B+→ φK+µ +µ − are presented using data corresponding to an integrated luminosity of 3.0 fb−1 , collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. The branching fractions of the decays are B(B +→K+π +π −µ +µ −) = 4.36 +0.29 −0.27 (stat) ± 0.21 (syst) ± 0.18 (norm) × 10−7 , B(B +→φK+µ +µ −) = 0.82 +0.19 −0.17 (stat) +0.10 −0.04 (syst) ± 0.27 (norm) × 10−7 , where the uncertainties are statistical, systematic, and due to the uncertainty on the branching fractions of the normalisation modes. A measurement of the differential branching fraction in bins of the invariant mass squared of the dimuon system is also presented for the decay B+→ K+π +π −µ +µ −. Keywords: Rare decay, Hadron-Hadron Scattering, B physics, Flavor physi
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It is part of: Journal of High Energy Physics, 2014, vol. 10, num. 064, p. 1-18
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ISSN: 1126-6708
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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