doctoral thesis
Matic Lubej (Author), Anže Zupanc (Mentor)

Abstract

We present the branching fraction measurement of the charmless semileptonic decay $B^+ \to K^+K^-\ell^+\nu_\ell$. The measurement has been performed on a data sample corresponding to 710 $\rm{fb^{-1}}$ of integrated luminosity, collected with the Belle detector at the KEKB asymmetric-energy $e^+$$e^-$ collider in Tsukuba, Japan. We present the results obtained with the B2BII data format converter. This is the first measurement of the decay, where we obtain the branching fraction of $\mathcal{B}(B^+ \to K^+K^-\ell^+\nu) = (3.04 \pm 0.51 \pm ^{+0.67} _{-0.66}) \times 10^{-5}$. With the signal significance of 4.6$\sigma$, this measurement counts as the first evidence for the decay.

Keywords

physics;elementary particles;Belle detector;B mesons;semileptonic decays;branching fraction;

Data

Language: English
Year of publishing:
Typology: 2.08 - Doctoral Dissertation
Organization: UL FMF - Faculty of Mathematics and Physics
Publisher: [M. Lubej]
UDC: 539.1(043.3)
COBISS: 3271012 Link will open in a new window
Views: 761
Downloads: 263
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Other data

Secondary language: Slovenian
Secondary title: Študija razpadov $B \to KK\ell\nu_\ell$ pri Belle
Secondary abstract: V disertaciji predstavljamo meritev razvejitvenega razmerja ne-čarobnega semileptonskega razpada $B^+ \to K^+K^-\ell^+\nu_\ell$. Meritev je bila opravljena na vzorcu podatkov, ki ustreza integrirani luminoznosti 710 $\rm{fb^{-1}}$, zbranim z detektorjem Belle na asimetričnem trkalniku delcev $e^+$$e^-$ KEKB v mestu Tsukuba, na Japonskem. V delu predstavimo rezultate, ki so bili pridobljeni s konverzijo B2BII. To je prva meritev tega razpada, kjer izmerimo razvejitveno razmerje $\mathcal{B}(B^+ \to K^+K^-\ell^+\nu) = (3.04 \pm 0.51 \pm ^{+0.67} _{-0.66}) \times 10^{-5}$. S signifikanco 4.6$\sigma$ ta meritev šteje kot prvi dokaz za ta razpad.
Secondary keywords: fizika osnovnih delcev;detektor Belle;mezoni B;semileptonski razpadi;razvejitveno razmerje;
Type (COBISS): Doctoral dissertation
Study programme: 0
Thesis comment: Univ. v Ljubljani, Fak. za matematiko in fiziko, Oddelek za fiziko
Pages: XVI, 210 str.
ID: 10989831