학술논문
Measurement of the spin of the Ξ(1530) resonance
Document Type
article
Author
Aubert, B; Bona, M; Karyotakis, Y; Lees, JP; Poireau, V; Prudent, X; Tisserand, V; Zghiche, A; Tico, JG; Grauges, E; Lopez, L; Palano, A; Pappagallo, M; Eigen, G; Stugu, B; Sun, L; Abrams, GS; Battaglia, M; Brown, DN; Button-Shafer, J; Cahn, RN; Jacobsen, RG; Kadyk, JA; Kerth, LT; Kolomensky, YG; Kukartsev, G; Lynch, G; Osipenkov, IL; Ronan, MT; Tackmann, K; Tanabe, T; Wenzel, WA; Hawkes, CM; Soni, N; Watson, AT; Koch, H; Schroeder, T; Walker, D; Asgeirsson, DJ; Cuhadar-Donszelmann, T; Fulsom, BG; Hearty, C; Mattison, TS; McKenna, JA; Barrett, M; Khan, A; Saleem, M; Teodorescu, L; Blinov, VE; Bukin, AD; Buzykaev, AR; Druzhinin, VP; Golubev, VB; Onuchin, AP; Serednyakov, SI; Skovpen, YI; Solodov, EP; Todyshev, KY; Bondioli, M; Curry, S; Eschrich, I; Kirkby, D; Lankford, AJ; Lund, P; Mandelkern, M; Martin, EC; Stoker, DP; Abachi, S; Buchanan, C; Gary, JW; Liu, F; Long, O; Shen, BC; Vitug, GM; Yasin, Z; Zhang, L; Paar, HP; Rahatlou, S; Sharma, V; Campagnari, C; Hong, TM; Kovalskyi, D; Mazur, MA; Richman, JD; Beck, TW; Eisner, AM; Flacco, CJ; Heusch, CA; Kroseberg, J; Lockman, WS; Schalk, T; Schumm, BA; Seiden, A; Wilson, MG; Winstrom, LO; Chen, E; Cheng, CH; Doll, DA; Echenard, B; Fang, F
Source
Physical Review D - Particles, Fields, Gravitation and Cosmology. 78(3)
Subject
Language
Abstract
The properties of the Ξ(1530) resonance are investigated in the Λc+→Ξ-π+K+ decay process. The data sample was collected with the BABAR detector at the SLAC PEP-II asymmetric-energy e+e- collider operating at center-of-mass energies 10.58 and 10.54 GeV. The corresponding integrated luminosity is approximately 230fb-1. The spin of the Ξ(1530) is established to be 3/2. The existence of an S-wave amplitude in the Ξ-π+ system is inferred, and its interference with the Ξ(1530)0 amplitude provides the first clear demonstration of the Breit-Wigner phase motion expected for the Ξ(1530). The P1(cos θΞ-) Legendre polynomial moment indicates the presence of a significant S-wave amplitude for Ξ-π+ mass values above 1.6GeV/c2, and a dip in the mass distribution at approximately 1.7GeV/c2 is interpreted as due to the coherent addition of a Ξ(1690)0 contribution to this amplitude. This would imply JP=1/2- for the Ξ(1690). Attempts at fitting the Ξ(1530)0 line shape yield unsatisfactory results, and this failure is attributed to interference effects associated with the amplitudes describing the K+π+ and/or Ξ-K+ systems. © 2008 The American Physical Society.