Charmless hadronic three-body decays of neutral B mesons with a KS in the final state in the LHCb experiment: branching fractions and an amplitude analysis

Abstract : This dissertation presents several studies of the decays of both Bd and Bs mesons to charmless three-body final states including a KS meson. They use the data recorded by the LHCb experiment during Run I of LHC, corresponding to an integrated luminosity of 3 fb-1. A first analysis consists of the measurement of the branching fractions of B(d,s)->KSh+h'- decays, where h(') designates a kaon or a pion. Preceding LHCb measurements of branching fractions for all decay channels, relative to that of Bd->KSpi+pi-, are updated. Furthermore, the primary goal of this analysis is to search for the, as yet, unobserved decay Bs->KSK+K-. The relative branching fractions are measured to be: B(Bs->KSpi+pi-)/B(Bd->KSpi+pi-) = 0.26 +/- 0.04(stat.) +/- 0.02(syst.) +/- 0.01(f_s/f_d) B(Bd->KSKpi)/B(Bd->KSpi+pi-) = 0.17 +/- 0.02(stat.) +/- 0.00(syst.) B(Bs->KSKpi)/B(Bd->KSpi+pi-) = 1.84 +/- 0.07(stat.) +/- 0.02(syst.) +/- 0.04(f_s/f_d) B(Bd->KSKK)/B(Bd->KSpi+pi-) = 0.59 +/- 0.02(stat.) +/- 0.01(syst.) A first observation of Bs->KSK+K- is reported with a global significance of 3.7 sigmas. A flavour-untagged, time-independent Dalitz-plot analysis of Bd->KSK+K- is presented, using the isobar approach. The quasi-two-body branching fractions of Bd->KS phi, Bd->KS f'2(1525), and Bd->KS chic0 are measured. They are compatible with previous measurements from Babar.
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Contributor : Louis Henry <>
Submitted on : Thursday, December 8, 2016 - 5:21:36 PM
Last modification on : Sunday, March 31, 2019 - 1:29:03 AM
Long-term archiving on : Thursday, March 23, 2017 - 8:41:08 AM

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  • HAL Id : tel-01412761, version 1

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Louis Henry. Charmless hadronic three-body decays of neutral B mesons with a KS in the final state in the LHCb experiment: branching fractions and an amplitude analysis . High Energy Physics - Experiment [hep-ex]. Université Pierre et Marie Curie (Paris 6), 2016. English. ⟨tel-01412761⟩

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