Header

UZH-Logo

Maintenance Infos

Amplitude analysis and branching fraction measurement of Bs->J/ψK+K-


LHCb Collaboration; et al; Bernet, R; Müller, K; Steinkamp, O; Straumann, U; Vollhardt, A (2013). Amplitude analysis and branching fraction measurement of Bs->J/ψK+K-. Physical Review D (Particles, Fields, Gravitation and Cosmology), 87(7):072004.

Abstract

An amplitude analysis of the final state structure in the B¯¯¯0s→J/ψK+K− decay mode is performed using 1.0  fb−1 of data collected by the LHCb experiment in 7 TeV center-of-mass energy pp collisions produced by the LHC. A modified Dalitz plot analysis of the final state is performed using both the invariant mass spectra and the decay angular distributions. Resonant structures are observed in the K+K− mass spectrum as well as a significant nonresonant S-wave contribution over the entire K+K− mass range. The largest resonant component is the ϕ(1020), accompanied by f0(980), f′2(1525), and four additional resonances. The overall branching fraction is measured to be B(B¯¯¯0s→J/ψK+K−)=(7.70±0.08±0.39±0.60)×10−4, where the first uncertainty is statistical, the second systematic, and the third due to the ratio of the number of B¯¯¯0s to B− mesons produced. The mass and width of the f′2(1525) are measured to be 1522.2±2.8+5.3−2.0  MeV and 84±6+10−5  MeV, respectively. The final state fractions of the other resonant states are also reported.

Abstract

An amplitude analysis of the final state structure in the B¯¯¯0s→J/ψK+K− decay mode is performed using 1.0  fb−1 of data collected by the LHCb experiment in 7 TeV center-of-mass energy pp collisions produced by the LHC. A modified Dalitz plot analysis of the final state is performed using both the invariant mass spectra and the decay angular distributions. Resonant structures are observed in the K+K− mass spectrum as well as a significant nonresonant S-wave contribution over the entire K+K− mass range. The largest resonant component is the ϕ(1020), accompanied by f0(980), f′2(1525), and four additional resonances. The overall branching fraction is measured to be B(B¯¯¯0s→J/ψK+K−)=(7.70±0.08±0.39±0.60)×10−4, where the first uncertainty is statistical, the second systematic, and the third due to the ratio of the number of B¯¯¯0s to B− mesons produced. The mass and width of the f′2(1525) are measured to be 1522.2±2.8+5.3−2.0  MeV and 84±6+10−5  MeV, respectively. The final state fractions of the other resonant states are also reported.

Statistics

Citations

19 citations in Web of Science®
24 citations in Scopus®
Google Scholar™

Altmetrics

Downloads

22 downloads since deposited on 17 Feb 2014
7 downloads since 12 months
Detailed statistics

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2013
Deposited On:17 Feb 2014 13:18
Last Modified:05 Apr 2016 17:36
Publisher:American Physical Society
ISSN:1550-2368
Publisher DOI:https://doi.org/10.1103/PhysRevD.87.072004

Download

Download PDF  'Amplitude analysis and branching fraction measurement of Bs->J/ψK+K-'.
Preview
Content: Accepted Version
Filetype: PDF
Size: 5MB
View at publisher