Observation of a J{sup PC}=1{sup -+} Exotic Resonance in Diffractive Dissociation of 190 GeV/c {pi}{sup -} into {pi}{sup -{pi}-{pi}+}

Journal Article · Fri Jun 18 00:00:00 EDT 2010 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.104.241803· OSTI ID:21415248

Alekseev, M G; Colantoni, M; Denisov, O Yu; Maggiora, A ^[1]; Alexakhin, V Yu; Alexeev, G D; Efremov, A; Finger, M Jr; Gavrichtchouk, O P; Gushterski, R; Guskov, A; Ivanov, O; Ivanshin, Yu; Komissarov, E V; Kroumchtein, Z V; Maximov, A N; Nagaytsev, A; Olshevsky, A G; Perevalova, E; Peshekhonov, D V ^[2]

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1. Torino Section of INFN, 10125 Turin (Italy)
2. Joint Institute for Nuclear Research, 141980 Dubna, Moscow region (Russian Federation)

The COMPASS experiment at the CERN SPS has studied the diffractive dissociation of negative pions into the {pi}{sup -{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 t{sup '} between 0.1 and 1 GeV{sup 2}/c{sup 2}. The well-known resonances a{sub 1}(1260), a{sub 2}(1320), and {pi}{sub 2}(1670) are clearly observed. In addition, the data show a significant natural-parity exchange production of a resonance with spin-exotic quantum numbers J{sup PC}=1{sup -+} at 1.66 GeV/c{sup 2} decaying to {rho}{pi}. The resonant nature of this wave is evident from the mass-dependent phase differences to the J{sup PC}=2{sup -+} and 1{sup ++} waves. From a mass-dependent fit a resonance mass of (1660{+-}10{sub -64}{sup +0}) MeV/c{sup 2} and a width of (269{+-}21{sub -64}{sup +42}) MeV/c{sup 2} are deduced, with an intensity of (1.7{+-}0.2)% of the total intensity.

• OSTI ID: 21415248
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 24 Vol. 104; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
A1-1260 MESONS
A2-1320 MESONS
ACCELERATORS
ANGULAR MOMENTUM
AXIAL VECTOR MESONS
BARYONS
BEAMS
BOSONS
CERN SPS SYNCHROTRON
CYCLIC ACCELERATORS
ELEMENTARY PARTICLES
ENERGY RANGE
EXOTIC RESONANCES
FERMIONS
GEV RANGE
HADRONS
HYPERONS
MATHEMATICAL MODELS
MESON BEAMS
MESONS
MEV RANGE
MOMENTUM TRANSFER
MULTIPERIPHERAL MODEL
PARTIAL WAVES
PARTICLE BEAMS
PARTICLE MODELS
PARTICLE PRODUCTION
PARTICLE PROPERTIES
PERIPHERAL MODELS
PI2-1670 MESONS
PION BEAMS
PIONS
PIONS MINUS
PIONS PLUS
PSEUDOSCALAR MESONS
QUANTUM NUMBERS
RESONANCE PARTICLES
SIGMA BARYONS
SIGMA-1660 BARYONS
SPIN
STRANGE PARTICLES
SYNCHROTRONS
TENSOR MESONS