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Study of the Bc+ ? J/?Ds+ and Bc+ ? J/?Ds*+ decays with the ATLAS detector

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posted on 2023-06-09, 05:44 authored by Benedict AllbrookeBenedict Allbrooke, Lily AsquithLily Asquith, Alessandro CerriAlessandro Cerri, C A Chavez Barajas, Antonella De SantoAntonella De Santo, Fabrizio SalvatoreFabrizio Salvatore, I Santoyo Castillo, K Suruliz, Mark SuttonMark Sutton, Iacopo Vivarelli, The ATLAS Collaboration
The decays Bc+?J/?Ds+ and Bc+?J/?Ds*+ are studied with the ATLAS detector at the LHC using a dataset corresponding to integrated luminosities of 4.9 and 20.6 fb -¹ of pp collisions collected at centre-of-mass energies vs=7 TeV and 8 TeV, respectively. Signal candidates are identified through J/??µ+µ- and Ds(*)+??p+(?/p0)decays. With a two-dimensional likelihood fit involving the Bc+ econstructed invariant mass and an angle between the + and Ds+ candidate momenta in the muon pair rest frame, the yields of Bc+?J/?Ds+ and Bc+?J/?Ds*+, and the transverse polarisation fraction in Bc+?J/?Ds*+ decay are measured. The transverse polarisation fraction is determined to be G±±(Bc+?J/?Ds*+)/G(Bc+?J/?Ds*+)=0.38±0.23±0.07, and the derived ratio of the branching fractions of the two modes is BBc+?J/?Ds*+/BBc+?J/?Ds+=2.8-0.8+1.2±0.3, where the first error is statistical and the second is systematic. Finally, a sample of Bc+?J ?p+ decays is used to derive the ratios of branching fractions BBc+?J/?Ds+/BBc+?J/?p+=3.8±1.1±0.4±0.2 and BBc+?J/?Ds*+/BBc+?J ?p+=10.4±3.1±1.5±0.6, where the third error corresponds to the uncertainty of the branching fraction of Ds+??(K+K-)p+ decay. The available theoretical predictions are generally consistent with the measurement.

Funding

ATLAS; G0275; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/I006048/1

History

Publication status

  • Published

File Version

  • Published version

Journal

European Physical Journal C: Particles and Fields

ISSN

1434-6044

Publisher

Springer Verlag

Issue

1

Volume

76

Article number

a4

Department affiliated with

  • Physics and Astronomy Publications

Research groups affiliated with

  • Experimental Particle Physics Research Group Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2017-04-11

First Open Access (FOA) Date

2017-04-11

First Compliant Deposit (FCD) Date

2017-04-11

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