@Article{LHCbCollaborationAaij_etal2015,
author="LHCb Collaboration (Aaij, R. et al
and Martinez-Vidal, F.
and Oyanguren, A.
and Ruiz Valls, P.
and Sanchez Mayordomo, C.",
title="Observation of Two New Xi(-)(b) Baryon Resonances",
journal="Physical Review Letters",
year="2015",
publisher="Amer Physical Soc",
volume="114",
number="6",
pages="062004--9pp",
abstract="Two structures are observed close to the kinematic threshold in the Xi(0)(b)pi(-) mass spectrum in a sample of proton-proton collision data, corresponding to an integrated luminosity of 3.0 fb(-1), recorded by the LEICb experiment. In the quark model, two baryonic resonances with quark content bds are expected in this mass region: the spin-parity J(P) = (1/2)(+) and J(P) = (3/2)(+) states, denoted Xi{\textquoteright}(-)(b) and Xi*(-)(b). Interpreting the structures as these resonances, we measure the mass differences and the width of the heavier state to be m(Xi{\textquoteright}(-)(b)) -- m(Xi(0)(b)) -- m(pi(-))=3.653 +/- 0.018 +/- 0.006 MeV/c(2), m(Xi*(-)(b)) -- m(Xi(0)(b)) -- m(pi(-)) = 23.96 +/- 0.12 +/- 0.06 MeV/e(2), Gamma(Xi*(-)(b)) = 1.65 +/- 0.31 +/- 0.10 MeV, where the first and second uncertainties are statistical and systematic, respectively. The width of the lighter state is consistent with zero, and we place an upper limit of Gamma(Xi{\textquoteright}(-)(b)) < 0.08 MeV at 95{\%} confidence level. Relative production rates of these states are also reported.",
optnote="WOS:000349490200004",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=2127), last updated on Fri, 20 Mar 2015 09:27:31 +0000",
issn="0031-9007",
doi="10.1103/PhysRevLett.114.062004",
opturl="http://arxiv.org/abs/1411.4849",
opturl="https://doi.org/10.1103/PhysRevLett.114.062004",
archivePrefix="arXiv",
eprint="1411.4849",
language="English"
}