Measurement of the ratio of  the production cross-section times branching fraction between the Bc to J/psi pi and the B+ to J/psi K
and of branching fractions Bc to J/psi pi pi pi  over Bc to J/psi pi in CMS at sqrt(s)=7 TeV.

Measurement of the ratio of the production cross-section times branching fraction between the Bc to J/psi pi and the B+ to J/psi K and of branching fractions Bc to J/psi pi pi pi over Bc to J/psi pi in CMS at sqrt(s)=7 TeV.

CMS

Collaboration

2013

13 pages

Report number:

CMS-PAS-BPH-12-011

Experiments:

CERN-LHC-CMS

View in:

CERN Document Server

pdf

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Abstract:

The

\mathrm{B^{\pm}_c} \to J/\psi \pi^{\pm}

and

\mathrm{B^{\pm}_c} \to J/\psi \pi^{\pm} \pi^{\pm} \pi^{\mp}

decay modes are studied in CMS in the kinematic region where the transverse momentum of the

\mathrm{B^{\pm}_c}

meson is greater than 15 GeV/c and within the central rapidity region

|y|<

1.6. Two ratios are measured:

\frac{\sigma(\mathrm{B^{\pm}_c})\times \mathrm{Br}(\mathrm{B^{\pm}_c} \to J/\psi \pi^{\pm})} {\sigma(\mathrm{B^{\pm}})\times \mathrm{Br}(\mathrm{B^{\pm}} \to J/\psi \mathrm{K^{\pm}})}= (0.48 \pm 0.05 \,(stat) \pm 0.04 \,(syst) \,{^{+0.05}_{-0.03}}\, (\tau_{Bc})) \times 10^{-2}

and

\frac{\mathrm{Br}(\mathrm{B^{\pm}_c} \to J/\psi \pi^{\pm}\pi^{\pm}\pi^{\mp})}{\mathrm{Br}(\mathrm{B_c^{\pm}} \to J/\psi \pi^{\pm})}= 2.43\pm0.76 \,(stat) \,{^{+0.46}_{-0.44}} \,(syst).

Note:

Preliminary results

Data
B/c: branching ratio
J/psi(3100)
CMS
transverse momentum: high
rapidity: central region
p p: interaction
bottom meson: hadroproduction
B/c: hadronic decay
B: hadronic decay

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