欧洲核子研究中心超级质子同步加速器质子-质子碰撞中奇异的S = -2、Q = -2重子共振的证据。
Evidence for an exotic S= -2, Q= -2 baryon resonance in proton-proton collisions at the CERN SPS.
作者信息
Alt C, Anticic T, Baatar B, Barna D, Bartke J, Betev L, Białkowska H, Billmeier A, Blume C, Boimska B, Botje M, Bracinik J, Bramm R, Brun R, Buncić P, Cerny V, Christakoglou P, Chvala O, Cramer J G, Csató P, Darmenov N, Dimitrov A, Dinkelaker P, Eckardt V, Farantatos G, Filip P, Flierl D, Fodor Z, Foka P, Freund P, Friese V, Gál J, Gaździcki M, Georgopoulos G, Gładysz E, Hegyi S, Höhne C, Kadija K, Karev A, Kniege S, Kolesnikov V I, Kollegger T, Korus R, Kowalski M, Kraus I, Kreps M, van Leeuwen M, Lévai P, Litov L, Makariev M, Malakhov A I, Markert C, Mateev M, Mayes B W, Melkumov G L, Meurer C, Mischke A, Mitrovski M, Molnár J, Mrówczyński St, Pálla G, Panagiotou A D, Panayotov D, Perl K, Petridis A, Pikna M, Pinsky L, Pühlhofer F, Reid J G, Renfordt R, Retyk W, Roland C, Roland G, Rybczyński M, Rybicki A, Sandoval A, Sann H, Schmitz N, Seyboth P, Siklér F, Sitar B, Skrzypczak E, Stefanek G, Stock R, Ströbele H, Susa T, Szentpétery I, Sziklai J, Trainor T A, Varga D, Vassiliou M, Veres G I, Vesztergombi G, Vranić D, Wetzler A, Włodarczyk Z, Yoo I K, Zaranek J, Zimányi J
机构信息
Fachbereich Physik der Universität, D-60486 Frankfurt, Germany.
出版信息
Phys Rev Lett. 2004 Jan 30;92(4):042003. doi: 10.1103/PhysRevLett.92.042003. Epub 2004 Jan 29.
Results of resonance searches in the Xi(-)pi(-), Xi(-)pi(+), Xi;(+)pi(-), and Xi;(+)pi(+) invariant mass spectra in proton-proton collisions at sqrt[s]=17.2 GeV are presented. Evidence is shown for the existence of a narrow Xi(-)pi(-) baryon resonance with mass of 1.862+/-0.002 GeV/c(2) and width below the detector resolution of about 0.018 GeV/c(2). The significance is estimated to be above 4.2sigma. This state is a candidate for the hypothetical exotic Xi(--)(3/2) baryon with S=-2, I=3 / 2, and a quark content of (dsdsū). At the same mass, a peak is observed in the Xi(-)pi(+) spectrum which is a candidate for the Xi(0)(3/2) member of this isospin quartet with a quark content of (dsus[-]d). The corresponding antibaryon spectra also show enhancements at the same invariant mass.
给出了在质心能量√s = 17.2 GeV的质子-质子碰撞中，Ξ⁻π⁻、Ξ⁻π⁺、Ξ⁺π⁻和Ξ⁺π⁺不变质量谱的共振搜索结果。结果表明存在一个窄的Ξ⁻π⁻重子共振，其质量为1.862±0.002 GeV/c²，宽度低于探测器分辨率，约为0.018 GeV/c²。显著性估计高于4.2σ。这个态是假设的奇异Ξ⁻⁻(3/2)重子的候选者，其奇异数S = -2，同位旋I = 3 / 2，夸克组成为(dsdsū)。在相同质量处，在Ξ⁻π⁺谱中观察到一个峰，它是这个同位旋四重态中Ξ⁰(3/2)成员的候选者，夸克组成为(dsus⁻d)。相应的反重子谱在相同的不变质量处也显示出增强。
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