67 research outputs found
Observation of a J^PC = 1-+ exotic resonance in diffractive dissociation of 190 GeV/c pi- into pi- pi- pi+
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.Comment: 7 page, 3 figures; version 2 gives some more details, data unchanged;
version 3 updated authors, text shortened, data unchange
Differential expression of alternatively spliced transcripts related to energy metabolism in colorectal cancer
Investigation of rotating detonation fueled by pre-combustion cracked kerosene under different channel widths
Evolution of zircons from postorogenic intrusive series with Li-F granites, Russian Far East
Analysis of coexistence of the recent invader Diaphanosoma orghidani Negrea with the aboriginal species D. brachyurum (Lievin) (Crustacea, Cladocera) in the Rybinsk reservoir
Review of Possible PBs Applications for Structure Diagnostics and as an Effective Source of X-ray and UV Radiation
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