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Direct observation of the strange b baryon Xi(-)(b)
- Authors
- Kahn, S[Kahn, S.]; Tully, C[Tully, C.]; Abazov, VM[Abazov, V. M.]; Kajfasz, E[Kajfasz, E.]; Tuts, PM[Tuts, P. M.]; Abbott, B[Abbott, B.]; Kalinin, AM[Kalinin, A. M.]; Unalan, R[Unalan, R.]; Abolins, M[Abolins, M.]; Kalk, JR[Kalk, J. R.]; Uvarov, S[Uvarov, S.]; Acharya, BS[Acharya, B. S.]; Kalk, JM[Kalk, J. M.]; Uvarov, L[Uvarov, L.]; Adams, M[Adams, M.]; Kappler, S[Kappler, S.]; Uzunyan, S[Uzunyan, S.]; Adams, T[Adams, T.]; Karmanov, D[Karmanov, D.]; Vachon, B[Vachon, B.]; Aguilo, E[Aguilo, E.]; Kasper, J[Kasper, J.]; van den Berg, PJ[van den Berg, P. J.]; Ahn, SH[Ahn, S. H.]; Kasper, P[Kasper, P.]; van Eijk, B[van Eijk, B.]; Ahsan, M[Ahsan, M.]; Katsanos, I[Katsanos, I.]; Van Kooten, R[Van Kooten, R.]; Alexeev, GD[Alexeev, G. D.]; Kau, D[Kau, D.]; van Leeuwen, WM[van Leeuwen, W. M.]; Alkhazov, G[Alkhazov, G.]; Kaur, R[Kaur, R.]; Varelas, N[Varelas, N.]; Alton, A[Alton, A.]; Kaushik, V[Kaushik, V.]; Varnes, EW[Varnes, E. W.]; Alverson, G[Alverson, G.]; Kehoe, R[Kehoe, R.]; Vartapetian, A[Vartapetian, A.]; Alves, GA[Alves, G. A.]; Kermiche, S[Kermiche, S.]; Vasilyev, IA[Vasilyev, I. A.]; Anastasoaie, M[Anastasoaie, M.]; Khalatyan, N[Khalatyan, N.]; Vaupel, M[Vaupel, M.]; Ancu, LS[Ancu, L. S.]; Khanov, A[Khanov, A.]; Verdier, P[Verdier, P.]; Andeen, T[Andeen, T.]; Kharchilava, A[Kharchilava, A.]; Vertogradov, LS[Vertogradov, L. S.]; Anderson, S[Anderson, S.]; Kharzheev, YM[Kharzheev, Y. M.]; Vertogradova, Y[Vertogradova, Y.]; Andrieu, B[Andrieu, B.]; Khatidze, D[Khatidze, D.]; Verzocchi, M[Verzocchi, M.]; Anzelc, MS[Anzelc, M. S.]; Kim, H[Kim, H.]; Villeneuve-Seguier, F[Villeneuve-Seguier, F.]; Arnoud, Y[Arnoud, Y.]; Kim, TJ[Kim, T. J.]; Vint, P[Vint, P.]; Arov, M[Arov, M.]; Kirby, MH[Kirby, M. H.]; Vokac, P[Vokac, P.]; Arthaud, M[Arthaud, M.]; Kirsch, M[Kirsch, M.]; Von Toerne, E[Von Toerne, E.]; Askew, A[Askew, A.]; Klima, B[Klima, B.]; Voutilainen, M[Voutilainen, M.]; Asman, B[Asman, B.]; Kohli, JM[Kohli, J. M.]; Vreeswijk, M[Vreeswijk, M.]; Jesus, ACSA[Jesus, A. C. S. Assis]; Konrath, JP[Konrath, J.-P.]; Wagner, R[Wagner, R.]; Atramentov, O[Atramentov, O.]; Kopal, M[Kopal, M.]; Wahl, HD[Wahl, H. D.]; Autermann, C[Autermann, C.]; Korablev, VM[Korablev, V. M.]; Wang, L[Wang, L.]; Avila, C[Avila, C.]; Kothari, B[Kothari, B.]; Swang, MHL[Swang, M. H. L.]; Ay, C[Ay, C.]; Kozelov, AV[Kozelov, A. V.]; Warchol, J[Warchol, J.]; Badaud, F[Badaud, F.]; Krop, D[Krop, D.]; Watts, G[Watts, G.]; Baden, A[Baden, A.]; Kryemadhi, A[Kryemadhi, A.]; Wayne, M[Wayne, M.]; Bagby, L[Bagby, L.]; Kuhl, T[Kuhl, T.]; Weber, M[Weber, M.]; Baldin, B[Baldin, B.]; Kumar, A[Kumar, A.]; Weber, G[Weber, G.]; Bandurin, DV[Bandurin, D. V.]; Kunori, S[Kunori, S.]; Weerts, H[Weerts, H.]; Banerjee, S[Banerjee, S.]; Kupco, A[Kupco, A.]; Wenger, A[Wenger, A.]; Banerjee, P[Banerjee, P.]; Kurca, T[Kurca, T.]; Wermes, N[Wermes, N.]; Barberis, E[Barberis, E.]; Kvita, J[Kvita, J.]; Wetstein, M[Wetstein, M.]; Barfuss, AF[Barfuss, A.-F.]; Lacroix, F[Lacroix, F.]; White, A[White, A.]; Bargassa, P[Bargassa, P.]; Lam, D[Lam, D.]; Wicke, D[Wicke, D.]; Baringer, P[Baringer, P.]; Lammers, S[Lammers, S.]; Wilson, GW[Wilson, G. W.]; Barreto, J[Barreto, J.]; Landsberg, G[Landsberg, G.]; Wimpenny, SJ[Wimpenny, S. J.]; Bartlett, JF[Bartlett, J. F.]; Lazoflores, J[Lazoflores, J.]; Wobisch, M[Wobisch, M.]; Bassler, U[Bassler, U.]; Lebrun, P[Lebrun, P.]; Wood, DR[Wood, D. R.]; Bauer, D[Bauer, D.]; Lee, WM[Lee, W. M.]; Wyatt, TR[Wyatt, T. 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P.]; Gillberg, D[Gillberg, D.]; Santoro, A[Santoro, A.]; Ginther, G[Ginther, G.]; Savage, G[Savage, G.]; Gollub, N[Gollub, N.]; Sawyer, L[Sawyer, L.]; Gomez, B[Gomez, B.]; Scanlon, T[Scanlon, T.]; Goussiou, A[Goussiou, A.]; Schaile, D[Schaile, D.]; Grannis, PD[Grannis, P. D.]; Schamberger, RD[Schamberger, R. D.]; Greenlee, H[Greenlee, H.]; Scheglov, Y[Scheglov, Y.]; Greenwood, ZD[Greenwood, Z. D.]; Schellman, H[Schellman, H.]; Gregores, EM[Gregores, E. M.]; Schieferdecker, P[Schieferdecker, P.]; Grenier, G[Grenier, G.]; Schliephake, T[Schliephake, T.]; Gris, P[Gris, Ph.]; Schmitt, C[Schmitt, C.]; Grivaz, JF[Grivaz, J.-F.]; Schwanenberger, C[Schwanenberger, C.]; Grohsjean, A[Grohsjean, A.]; Schwartzman, A[Schwartzman, A.]; Grunendahl, S[Gruenendahl, S.]; Schwienhorst, R[Schwienhorst, R.]; Grunewald, MW[Gruenewald, M. 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- Issue Date
- 3-Aug-2007
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW LETTERS, v.99, no.5
- Indexed
- SCIE
SCOPUS
- Journal Title
- PHYSICAL REVIEW LETTERS
- Volume
- 99
- Number
- 5
- ISSN
- 0031-9007
- Abstract
- We report the first direct observation of the strange b baryon Xi(-)(b)(Xi) over bar (+)(b)). We reconstruct the decay Xi(-)(b)-->J/psi Xi(-), with J/psi-->mu(+)mu(-), and Xi(-)-->Lambda pi(-)-->p pi(-)pi(-) in p (p) over bar collisions at root s = 1.96 TeV. Using 1.3 fb(-1) of data collected by the D0 detector, we observe 15.2 +/- 4.4(stat)(-0.4)(+1.9)(syst) Xi(-)(b) candidates at a mass of 5.774 +/- 0.011(stat) +/- 0.015(syst) GeV. The significance of the observed signal is 5.5 sigma, equivalent to a probability of 3.3 x 10(-8) of it arising from a background fluctuation. Normalizing to the decay Lambda(b)-->J/psi Lambda, we measure the relative rate sigma(Xi(-)(b))xB(Xi(-)(b)-->J/psi Xi)/ sigma(Lambda(b))xB(Lambda(b)-->J/psi Lambda) = 0.28 +/- 0.09(stat)(-0.08)(+0.09)(syst).
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