Determination of the Ratio of b -Quark Fragmentation Fractions f[subscript s]/f[subscript d] in pp Collisions at √s = 7 TeV with the ATLAS Detector

• Main Author: Taylor, Frank E (Contributor)
• Other Authors: Massachusetts Institute of Technology. Department of Physics (Contributor)
• Format: Article
• Language: English
• Published: American Physical Society (APS), 2018-05-29T18:27:34Z.
• Subjects: Article
• Online Access: Get fulltext

 Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. With an integrated luminosity of 2.47 fb[superscript -1] recorded by the ATLAS experiment at the LHC, the exclusive decays B[superscript 0][subscript s] → J/ψφ and B[superscript 0][subscript d]→J/ψK[superscript ∗0] of B mesons produced in pp collisions at √s=7 TeV are used to determine the ratio of fragmentation fractions f[subscript s]/f[superscript d]. From the observed B[superscript 0][subscript s]→J/ψφ and B[superscript 0][subscript d]→J/ψK[superscript ∗0] yields, the quantity (f[subscript s]/f[subscript d])[B(B[superscript 0][subscript s]→J/ψφ)/B(B[superscript 0][subscript d]→J/ψK[superscript ∗0])] is measured to be 0.199±0.004(stat)±0.008(syst). Using a recent theory prediction for [B(B[superscript 0][subscript s]→J/ψφ)/B(B[superscript 0][subscript d]→J/ψK[superscript ∗0])] yields (f[subscript s]/f[subscript d])=0.240±0.004(stat)±0.010(syst)±0.017(th). This result is based on a new approach that provides a significant improvement of the world average.