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Title: Measurement of the ratio of branching fractions and difference in CP asymmetries of the decays B + → J/ ψπ + and B + → J/ ψK +
Author: Camboni, Alessandro
Garrido Beltrán, Lluís
Gascón Fora, David
Graciani Díaz, Ricardo
Graugés Pous, Eugeni
Marin Benito, Carla
Picatoste Olloqui, Eduardo
Rives Molina, Vicente José
Alfonso Albero, Alejandro
Calvo Gomez, M.
Coquereau, Samuel
Gironella Gironell, Pere
Vazquez Gomez, R.
LHCb Collaboration
Keywords: Hadrons
Gran Col·lisionador d'Hadrons
Física de partícules
Large Hadron Collider (France and Switzerland)
Particle physics
Issue Date: Mar-2017
Publisher: Springer Verlag
Abstract: The ratio of branching fractions and the difference in CP asymmetries of the decays B + → J/ψπ + and B + → J/ψK + are measured using a data sample of pp collisions collected by the LHCb experiment, corresponding to an integrated luminosity of 3 fb-1 at centre-of-mass energies of 7 and 8 TeV. The results are B({B}+\to J/ψ {π}+)/B({B}+\to J/ψ {K}+)=(3.83± 0.03± 0.03)× {10}^{-2}, A^{CP}({B}+\to J/ψ {π}+)-A^{CP}({B}+\to J/ψ {K}+)=(1.82± 0.86± 0.14)× {10}^{-2}, where the first uncertainties are statistical and the second are systematic. Combining this result with a recent LHCb measurement of A^{CP}({B}+\to J/{ψ K}+) provides the most precise estimate to date of CP violation in the decay B + → J/ψπ +, A^{CP}({B}+\to J/{ψ π}+)=(1.91± 0.89± 0.16)× 1{0}^{-2}.
Note: Reproducció del document publicat a:
It is part of: Journal of High Energy Physics, 2017, vol. 2017, num. 36, 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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