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Article
Report number arXiv:0910.5842 ; CERN-PH-EP-2009-018 ; CERN-PH-EP-2009-018
Title Observation of a JPC=1+ exotic resonance in diffractive dissociation of 190 GeV/c π into πππ+
Author(s) COMPASS collaboration  Εμφάνιση και των 222 συγγραφέων
Publication 2010
Imprint 02 Nov 2009
Number of pages 10
Note Comments: 7 page, 3 figures
7 page, 3 figures; version 2 gives some more details, data unchanged; version 3 updated authors, text shortened, data unchanged
In: Phys. Rev. Lett. 104 (2010) 241803
DOI 10.1103/PhysRevLett.104.241803
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN SPS ; COMPASS NA58
Abstract 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 420000 events taken at values of the squared 4-momentum transfer t' between 0.1 and 1 GeV^2/c^2. 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 J^PC = 1-+ at 1.66 GeV/c^2 decaying to rho pi. The resonant nature of this wave is evident from the mass-dependent phase differences to the J^PC = 2-+ and 1++ waves. From a mass-dependent fit a resonance mass of 1660 +- 10+0-64 MeV/c^2 and a width of 269+-21+42-64 MeV/c^2 is deduced.
Copyright/License Preprint: © 2009-2025 CERN (License: CC-BY-3.0)

Corresponding record in: Inspire


 Δημιουργία εγγραφής 2009-11-03, τελευταία τροποποίηση 2025-02-19


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