Measurement of BR(Bu to phi K)/BR(Bu to J/psi K) at the collider detector at Fermilab
- Johns Hopkins Univ., Baltimore, MD (United States)
This thesis presents evidence for the decay mode B± → ΦK± in p$$\bar{p}$$ collisions at √s = 1.96 TeV using (120 ± 7)pb-1 of data collected by the Collider Detector at Fermilab (CDF). This signal is then used to measure the branching ratio relative to the decay mode B± → J/ΨK±. The measurement starts from reconstructing the two decay modes: B± → ΦK±, where Φ → K+K- and B± → J/ΨK±, where J/Ψ → μ+μ-. The measurement yielded 23 ± 7 B± → ΦK± events, and 406 ± 26 B± → J/ΨK± events. The fraction of B± → J/ΨK± events where the J/Ψ subsequently decayed to two muons (as opposed to two electrons) was found to be fμμ = 0.839 ± 0.066. The relative branching ratio of the two decays is then calculated based on the equation: BR(B± → ΦK±)/BR(B± → J/ΨK±) = N ΦK/NΨK • fμμ BR(J/Ψ → μ+μ-)/BR(Φ → K+K-) ϵμμK/ϵKKK R(ϵiso). The measurement finds BR(B± → ΦK±)/BR(B± → J/ΨK±) = 0.0068 ± 0.0021(stat.) ± 0.0007(syst.). The B± → ΦK± branching ratio is then found to be BR(B± → ΦK±) = [6.9 ± 2.1(stat.) ± 0.8(syst.)] x 10-6. This value is consistent with similar measurements reported by the e+e- collider experiments BaBar[1], Belle[2], and CLEO[3].
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76CH03000
- OSTI ID:
- 875572
- Report Number(s):
- FERMILAB-THESIS-2004-63; TRN: US0605293
- Country of Publication:
- United States
- Language:
- English
Similar Records
Measurement of the Inclusive B-Lifetime Using $\rm {J/\psi}$'s at the CDF Experiment
Observation of B$0\atop{s}$ → Ψ(2S)Φ and Measurement of Branching Ratio of B(B$0\atop{s}$ → Ψ(2S)Φ)/B(B$0\atop{s}$ → J/ΨΦ)