. (2011) First observation of(B)over-bar(s)(0) -> D(s2)*(+)X mu(-)(nu)over-bar decays. Physics Letters B, Vol.698 (No.1). pp. 14-20. ISSN 0370-2693

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Abstract

Using data collected with the LHCb detector in proton-proton collisions at a centre-of-mass energy of 7 TeV, the semileptonic decays (B) over bar (0)(s) -> D(+)X mu(-)(nu) over bar and (B) over bar (0)(s) -> D(0)K(+)X mu(-)(nu) over bar are detected. Two structures are observed in the D(0)K(+) mass spectrum at masses consistent with the known D(s1)(2536)(+) and D(s2)*(2573)(+) mesons. The measured branching fractions relative to the total (B) over bar (0)(s) semileptonic rate are B((B) over bar (0)(s) -> D(s2)(*)X mu(-)(nu) over bar /B(B(2)(-0) -> X mu(-)(nu) over bar) = (3.3 +/- 1.0 +/- 0.4)%, and B((B) over bar (0)(s) -> D(s2)(*)X mu(-)(nu) over bar /B(B(2)(-0) -> X mu(-)(nu) over bar) = (5.4 +/- 1.2 +/- 0.5)%, where the first uncertainty is statistical and the second is systematic. This is the first observation of the D(s2)*(+) state in B(s2)*(+) decays; we also measure its mass and width. (C) 2011 CERN. Published by Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Divisions:	Faculty of Science > Physics
Journal or Publication Title:	Physics Letters B
Publisher:	Elsevier Science BV
ISSN:	0370-2693
Date:	2011
Volume:	Vol.698
Number:	No.1
Page Range:	pp. 14-20
Identification Number:	10.1016/j.physletb.2011.02.039
Status:	Peer Reviewed
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/41584

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