Počet záznamů: 1

Observation of a JPC = 1–+ exotic resonance in diffractive dissociation of 190 GeV/c pi– into pi–pi–pi+

  1. 1.
    0351512 - UPT-D 2011 RIV US eng J - Článek v odborném periodiku
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    Observation of a JPC = 1–+ exotic resonance in diffractive dissociation of 190 GeV/c pi– into pi–pi–pi+.
    Physical Review Letters. Roč. 104, č. 24 (2010), 241803:1-7 ISSN 0031-9007
    Grant CEP: GA MŠk ME 492
    Výzkumný záměr: CEZ:AV0Z20650511
    Klíčová slova: exotic resonance * diffractive dissociation * pion * lead target
    Kód oboru RIV: BG - Jaderná, atomová a mol. fyzika, urychlovače
    Impakt faktor: 7.621, rok: 2010

    The COMPASS experiment at the CERN SPS has studied the diffractive dissociation of negative pions into the pi–pi–pi+ final state using a 190 GeV/c pion beam hitting a lead target. A partial wave analysis has been performed on a sample of 420 000 events taken at values of the squared 4-momentum transfer between 0.1 and 1 GeV(square)/c(square). The well-known resonances a1(1260), a2(1320), and pi2(1670) are clearly observed. In addition, the data show a significant natural-parity exchange production of a resonance with spin-exotic quantum numbers JPC = 1–+ at 1.66 GeV/c(square) decaying to ropi. The resonant nature of this wave is evident from the mass-dependent phase differences to the JPC= 2–+ and 1++ waves.
    Trvalý link: http://hdl.handle.net/11104/0191248