Publikation: Zeitschriftenartikel

Test of lepton flavor universality by the measurement of the B0D[star]-[tau]+ [nu][tau] branching fraction using three-prong [tau] decays

Grunddaten
Abstract
Autoren
Einrichtung

Grunddaten

Titel	Test of lepton flavor universality by the measurement of the B0D[star]-[tau]+ [nu][tau] branching fraction using three-prong [tau] decays
Erscheinungsjahr	2018
Band	97
Heft-Nr.	7
Jahr	2018
Publikationsform	Elektronische Ressource
Publikationsart	Zeitschriftenartikel
Sprache	Englisch
DOI	10.1103/PhysRevD.97.072013
Letzte Änderung	30.03.2021 06:06:06
Bearbeitungsstatus	durch UB Rostock abschließend validiert
Dauerhafte URL	http://purl.uni-rostock.de/fodb/pub/65499
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Abstract

The ratio of branching fractions R(D*)B(B0D*+)/B(B0D*+) is measured using a data sample of proton-proton collisions collected with the LHCb detector at center-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3 fb1. The lepton is reconstructed with three charged pions in the final state. A novel method is used that exploits the different vertex topologies of signal and backgrounds to isolate samples of semitauonic decays of b hadrons with high purity. Using the B0D*++ decay as the normalization channel, the ratio B(B0D*+)/B(B0D*++) is measured to be 1.97±0.13±0.18, where the first uncertainty is statistical and the second systematic. An average of branching fraction measurements for the normalization channel is used to derive B(B0D*+)=(1.42±0.094±0.129±0.054)%, where the third uncertainty is due to the limited knowledge of B(B0D*++). A test of lepton flavor universality is performed using the well-measured branching fraction B(B0D*+) to compute R(D*)=0.291±0.019±0.026±0.013, where the third uncertainty originates from the uncertainties on B(B0D*++) and B(B0D*+). This measurement is in agreement with the Standard Model prediction and with previous measurements.

Autoren

Aaij, Roel
D'Argent, Philippe
Bachmann, Sebastian
Berninghoff, Daniel
Braun, Svende
De Cian, Michel
Comerma-Montells, Albert
Dordei, Francesca
Dziewiecki, Michal
Gerick, David
Grabowski, Jascha
Grünberg, Oliver
Han, Xiaoxue
Hansmann-Menzemer, Stephanie
Heß, Miriam
Kecke, Matthieu
Khanji, Basem
Kolpin, Michael
Kopecná, Renata
Leverington, Blake
Marks, Jörg
Meinert, Nis
Mitzel, Dominik
Neubert, Sebastian
Piucci, Alessio
Stahl, Marian
Stemmle, Simon
van Tilburg, Jeroen
Uwer, Ulrich
Viemann, Harald
Waldi, Roland
Zhelezov, Alexey

Einrichtung

MNF/Institut für Physik (IfPH)