Pramana

, Volume 86, Issue 2, pp 471–477 | Cite as

Inclusive decays of B-meson to J/ψ and χ c1 using \(\boldsymbol {386\times 10^{6} B\bar {B}}\) events

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Abstract

The inclusive decays of B-mesons to charmonium have been studied in a data sample of 386 million \(B\bar {B}\) events. The data sample has been collected by the Belle detector at the KEKB asymmetric energy e + e − collider operating at the Υ(4S) resonance. The branching fractions have been measured for the inclusive decays to J/ψ + X and χ c1 + X. The measured branching fraction for J/ψ + X is \(\mathcal {B}(B \to J/\psi (\to e^{+}e^{-})+X) = (1.10\pm 0.005\pm 0.057)\%\) and \(\mathcal {B}(B\to J/\psi (\to \mu ^{+}\mu ^{-})+X) = (1.08\pm 0.004\pm 0.056)\%\), while the inclusive χ c1 + X branching fraction is found to be \(\mathcal {B}(B\to \chi _{c1}+X) = (0.44\pm 0.01\pm 0.06)\%\). The feed-down contribution from higher charmonium states is subtracted from the measured branching fractions and the direct branching fractions are obtained to be \(\mathcal {B}(B\to J/\psi +X) = (0.77\pm 0.04\pm 0.06)\%\) and \(\mathcal {B}(B \to \chi _{c1}+X) = (0.41\pm 0.01\pm 0.06)\%.\)

Keywords

B-meson CP violation charmonium B-factory Belle detector 

PACS Nos

13.25.Hw 11.30.Er 14.40.Nd 
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Notes

Acknowledgements

The author is highly grateful to the KEKB group for excellent operation of the accelerator, the KEK cryogenics group for efficient solenoid operations and the KEK computer group and the NII for valuable computing and SINET3 network support. The authors also acknowledge support from MEXT and JSPS (Japan); ARC and DEST (Australia); NSFC (China); DST (India, under Grant No. SR /S2 /HEP-05 /2011); MOEHRD, KOSEF, and KRF (Korea); KBN (Poland); MES and RFAAE (Russia); ARRS (Slovenia); SNSF (Switzerland); NSC and MOE (Taiwan); and DOE (USA).

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Copyright information

© Indian Academy of Sciences 2016

Authors and Affiliations

  1. 1.Department of Math. Stat. & PhysicsPunjab Agricultural UniversityLudhianaIndia

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