The and B (0) mixing frequencies, Delta m (s) and Delta m (d) , are measured using a data sample corresponding to an integrated luminosity of 1.0 fb(-1) collected by the LHCb experiment in pp collisions at a centre of mass energy of 7 TeV during 2011. Around 1.8x10(6) candidate events are selected of the type (+ anything), where about half are from peaking and combinatorial backgrounds. To determine the B decay times, a correction is required for the momentum carried by missing particles, which is performed using a simulation-based statistical method. Associated production of muons or mesons allows us to tag the initial-state flavour and so to resolve oscillations due to mixing. We obtain < The hypothesis of no oscillations is rejected by the equivalent of 5.8 standard deviations for and 13.0 standard deviations for B (0). This is the first observation of mixing to be made using only semileptonic decays.

Aaij, R., Carboni, G., Santovetti, E., & Ii, (2013). Observation of B-s(0)-(B)over-bar(s)(0) mixing and measurement of mixing frequencies using semileptonic B decays. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 73(12) [10.1140/epjc/s10052-013-2655-8].

Observation of B-s(0)-(B)over-bar(s)(0) mixing and measurement of mixing frequencies using semileptonic B decays

CARBONI, GIOVANNI;SANTOVETTI, EMANUELE;
2013

Abstract

The and B (0) mixing frequencies, Delta m (s) and Delta m (d) , are measured using a data sample corresponding to an integrated luminosity of 1.0 fb(-1) collected by the LHCb experiment in pp collisions at a centre of mass energy of 7 TeV during 2011. Around 1.8x10(6) candidate events are selected of the type (+ anything), where about half are from peaking and combinatorial backgrounds. To determine the B decay times, a correction is required for the momentum carried by missing particles, which is performed using a simulation-based statistical method. Associated production of muons or mesons allows us to tag the initial-state flavour and so to resolve oscillations due to mixing. We obtain < The hypothesis of no oscillations is rejected by the equivalent of 5.8 standard deviations for and 13.0 standard deviations for B (0). This is the first observation of mixing to be made using only semileptonic decays.
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/04 - Fisica Nucleare e Subnucleare
English
Aaij, R., Carboni, G., Santovetti, E., & Ii, (2013). Observation of B-s(0)-(B)over-bar(s)(0) mixing and measurement of mixing frequencies using semileptonic B decays. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 73(12) [10.1140/epjc/s10052-013-2655-8].
Aaij, R; Carboni, G; Santovetti, E; Ii,
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/136166
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