Measurement of the branching ratio of Bs0 → K0S K0S decays with the LHCb experiment

Schmelzer, Timon

Measurement of the branching ratio of Bs0 → K0S K0S decays with the LHCb experiment

dc.contributor.advisor	Spaan, Bernhard
dc.contributor.author	Schmelzer, Timon
dc.contributor.referee	Kröninger, Kevin
dc.date.accepted	2019-09-11
dc.date.accessioned	2019-09-25T05:39:34Z
dc.date.available	2019-09-25T05:39:34Z
dc.date.issued	2019
dc.description.abstract	The presented thesis deals with the branching ratio measurement of the decay channel Bs0 → KS0 KS0 reconstructed as two charged pion pairs. The data correspond to an integrated luminosity of 5 fb^{-1} collected by the LHCb experiment in proton-proton collisions at the centre-of-mass energies of sqrt{s} = 7 TeV (1 fb^{-1}), 8 TeV (2 fb^{-1}) and 13 TeV (2 fb^{-1}). As normalisation channel the decay B0 → φKS0 is used in which the φ meson is reconstructed as two charged kaons. The branching ratio is determined to be BR(Bs0 → KS0 KS0) = [9.5 +- 1.9 (stat) +- 0.9 (syst) +- 0.9 (BR(B0 → φKS0) +- 0.5 (f_d/f_s)] * 10^{-6}, whereby the Bs0 → KS0 KS0 component has a significance of 7.24σ. The result is consistent with measurements of the BELLE collaboration within less than one standard deviation and compatible with Standard Model predictions. Furthermore, the analysis represents the first study of b hadrons decaying exclusively into long lived V^0 particles at the LHCb experiment.	en
dc.identifier.uri	http://hdl.handle.net/2003/38249
dc.identifier.uri	http://dx.doi.org/10.17877/DE290R-20219
dc.language.iso	en	de
dc.subject	LHCb	de
dc.subject	Teilchenphysik	de
dc.subject	Verzweigungsverhältnis	de
dc.subject	HEP	de
dc.subject	Flavourphysik	de
dc.subject.ddc	530
dc.subject.rswk	LHCb <Teilchendetektor>	de
dc.subject.rswk	Elementarteilchenphysik	de
dc.subject.rswk	Hochenergiephysik	de
dc.subject.rswk	Hadron	de
dc.subject.rswk	Verzweigungsverhältnis	de
dc.title	Measurement of the branching ratio of Bs0 → K0S K0S decays with the LHCb experiment	en
dc.type	Text	de
dc.type.publicationtype	doctoralThesis	de
dcterms.accessRights	open access
eldorado.secondarypublication	false	de

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