Publikation: Zeitschriftenartikel

Differential branching fraction and angular analysis of 0b +- decays

Grunddaten
Abstract
Autoren
Einrichtung

Grunddaten

Titel	Differential branching fraction and angular analysis of 0b +- decays
Veröffentlicht in	Journal of high energy physics : JHEP ; a refereed journal written, run, and distributed by electronic means. - Berlin : Springer
Erscheinungsjahr	2015
Heft-Nr.	6
Jahr	2015
Publikationsform	Elektronische Ressource
Publikationsart	Zeitschriftenartikel
Sprache	Englisch
DOI	10.1007/JHEP06(2015)115
Letzte Änderung	09.10.2020 06:05:05
Bearbeitungsstatus	durch UB Rostock abschließend validiert
Dauerhafte URL	http://purl.uni-rostock.de/fodb/pub/48642
Links zu Katalogen

Abstract

The differential branching fraction of the rare decay b0 + is measured as a function of q2, the square of the dimuon invariant mass. The analysis is performed using proton-proton collision data, corresponding to an integrated luminosity of 3.0 fb1, collected by the LHCb experiment. Evidence of signal is observed in the q2 region below the square of the J/ mass. Integrating over 15 < q2 < 20 GeV2/c4 the differential branching fraction is measured asdb0+/dq2=1.180.08+0.09±0.03±0.27×107GeV2/c41,$$ \mathrm{d}\mathrm{\mathcal{B}}\left({\varLambda}_b^0\to \varLambda {\mu}^{+}{\mu}^{-}\right)/d{q}^2=\left({1.18}_{-0.08}^{+0.09}\pm 0.03\pm 0.27\right)\times {10}^{-7}{\left({\mathrm{GeV}}^2/{c}^4\right)}^{-1}, $$where the uncertainties are statistical, systematic and due to the normalisation mode, b0 J/, respectively. In the q2 intervals where the signal is observed, angular distributions are studied and the forward-backward asymmetries in the dimuon (AFB) and hadron (AFBh) systems are measured for the first time. In the range 15 < q2 < 20 GeV2/c4 they are found to beAFB=0.05±0.09stat±0.03systandAFBh=0.29±0.07stat±0.03syst.$$ \begin{array}{l}{A}_{\mathrm{FB}}^{\ell }=-0.05\pm 0.09\left(\mathrm{stat}\right)\pm 0.03\left(\mathrm{syst}\right)\;\mathrm{and}\hfill \\ {}{A}_{\mathrm{FB}}^h=-0.29\pm 0.07\left(\mathrm{stat}\right)\pm 0.03\left(\mathrm{syst}\right).\hfill \end{array} $$

Autoren

Aaij, Roel
Adeva, B.
Adinolfi, M.
Aquines Gutiérrez, Osvaldo
Bachmann, Sebastian
Bien, Alexander
Blouw, Johan
Braun, Svende
Britsch, Markward
Comerma-Montells, Albert
De Cian, Michel
Dordei, Francesca
Esen, Sevda
Färber, Christian
Fontana, Marianna
Gerick, David
Gersabeck, Evelina
Grillo, Lucia
Han, Xiaoxue
Hansmann-Menzemer, Stephanie
Jäger, Andreas
Kolpin, Michael
Kreplin, Katharina
Krocker, Georg Alexander
Leverington, Blake
Marks, Jörg
Meißner, Marco
Mitzel, Dominik
Neubert, Sebastian
Neuner, Max
Nikodem, Thomas
Schmelling, Michael
Seyfert, Paul
Stahl, Marian
Stahl, Sascha
Uwer, Ulrich
Vesterinen, Mika
Waldi, Roland
Wandernoth, Sebastian
Wiedner, Dirk
Zhelezov, Alexey

Einrichtung

MNF/Institut für Physik (IfPH)