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Evidence for a B-s(0)pi(+/-) State
Joint Inst Nucl Res, Dubna 141980, Russia..
Univ Oklahoma, Norman, OK 73019 USA..
Tata Inst Fundamental Res, Bombay 400005, Maharashtra, India..
Univ Illinois, Chicago, IL 60607 USA..
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2016 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 117, no 2, 022003Article in journal (Refereed) PublishedText
Abstract [en]

We report evidence for a narrow structure, X(5568), in the decay sequence X(5568) -> B-s(0)pi(+/-), B-s(0) -> J/psi phi, J/psi -> mu(+)mu(-), phi -> K+K-. This is evidence for the first instance of a hadronic state with valence quarks of four different flavors. The mass and natural width of this state are measured to be m = 5567.8 +/- 2.9(stat)(-1.9)(+0.9) (syst) MeV/c(2) and Gamma = 21.9 +/- 6.4(stat)(-2.5)(+5.0) (syst) MeV/c(2). If the decay is X(5568) -> B-s*pi(+/-). B-s(0)gamma pi(+/-) with an unseen gamma, m(X(5568)) will be shifted up by m(B-s*) - m(B-s(0)) similar to 49 MeV/c(2). This measurement is based on 10.4 fb(-1) of p (p) over bar collision data at root s = 1.96 TeV collected by the D0 experiment at the Fermilab Tevatron collider.

Place, publisher, year, edition, pages
2016. Vol. 117, no 2, 022003
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-300463DOI: 10.1103/PhysRevLett.117.022003ISI: 000379728700003PubMedID: 27447502OAI: oai:DiVA.org:uu-300463DiVA: diva2:951462
Funder
German Research Foundation (DFG)Swedish Research Council
Available from: 2016-08-09 Created: 2016-08-09 Last updated: 2016-08-09Bibliographically approved

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