Observation of Two New Xi(-)(b) Baryon Resonances
- Aaij, R.
- Adeva, B.
- Adinolfi, M.
- Affolder, A.
- Ajaltouni, Z.
- Akar, S.
- Albrecht, J.
- Alessio, F.
- Alexander, M.
- Ali, S.
- Alkhazov, G.
- Alvarez Cartelle, P.
- Alves, A. A.
- Amato, S.
- Amerio, S.
- Amhis, Y.
- An, L.
- Anderlini, L.
- Anderson, J.
- Andreassen, R.
- Andreotti, M.
- Andrews, J. E.
- Appleby, R. B.
- Aquines Gutierrez, O.
- Archilli, F.
- Artamonov, A.
- Artuso, M.
- Aslanides, E.
- Auriemma, G.
- Baalouch, M.
- Bachmann, S.
- Back, J. J.
- Badalov, A.
- Baesso, C.
- Baldini, W.
- Barlow, R. J.
- Barschel, C.
- Barsuk, S.
- Barter, W.
- Batozskaya, V.
- Battista, V.
- Bay, A.
- Beaucourt, L.
- Beddow, J.
- Bedeschi, F.
- Bediaga, I.
- Belogurov, S.
- Onderwater, C. J. G.
- Pellegrino, A.
- Wilschut, H. W.
DOIAbstract
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'(-)(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'(-)(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 t...
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