Publikation: Zeitschriftenartikel

Measurement of the mass and production rate of [xi] b [bar] baryons

Grunddaten
Abstract
Autoren
Einrichtung

Grunddaten

Titel	Measurement of the mass and production rate of [xi] b [bar] baryons
Erscheinungsjahr	2019
Band	99
Heft-Nr.	5
Jahr	2019
Publikationsform	Elektronische Ressource
Publikationsart	Zeitschriftenartikel
Sprache	Englisch
DOI	10.1103/PhysRevD.99.052006
Letzte Änderung	17.06.2020 06:04:36
Bearbeitungsstatus	durch UB Rostock abschließend validiert
Dauerhafte URL	http://purl.uni-rostock.de/fodb/pub/63737
Links zu Katalogen

Abstract

The first measurement of the production rate of b baryons in pp collisions relative to that of 0b baryons is reported, using data samples collected by the LHCb experiment, and corresponding to integrated luminosities of 1, 2 and 1.6 fb1 at s=7, 8 and 13 TeV, respectively. In the kinematic region 2<<6 and pT<20 GeV/c, we measure fbf0bB(bJ/)B(0bJ/)=(10.8±0.9±0.8)×102 [s=7,8 TeV], fbf0bB(bJ/)B(0bJ/)=(13.1±1.1±1.0)×102 [s=13 TeV], where fb and f0b are the fragmentation fractions of b quarks into b and 0b baryons, respectively; B represents branching fractions; and the uncertainties are due to statistical and experimental systematic sources. The values of fb/f0b are obtained by invoking SU(3) symmetry in the bJ/ and 0bJ/ decays. Production asymmetries between b and ¯+b baryons are also reported. The mass of the b baryon is also measured relative to that of the 0b baryon, from which it is found that m(b)=5796.70±0.39±0.15±0.17 MeV/c2, where the last uncertainty is due to the precision on the known 0b mass. This result represents the most precise determination of the b mass.

Autoren

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

Einrichtung

MNF/Institut für Physik (IfPH)