Observation of pi(+)pi(-)pi(+)pi(-) photoproduction in ultraperipheral heavy-ion collisions at root s(NN)=200 GeV at the STAR detector

0343358 - ÚJF 2011 RIV US eng J - Journal Article
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Observation of pi(+)pi(-)pi(+)pi(-) photoproduction in ultraperipheral heavy-ion collisions at root s(NN)=200 GeV at the STAR detector.
Physical Review. C. Roč. 81, č. 4 (2010), 044901/1-044901/9. ISSN 0556-2813
R&D Projects: GA ČR GA202/07/0079; GA MŠMT LA09013
Institutional research plan: CEZ:AV0Z10480505; CEZ:AV0Z10100502
Keywords : HELICITY-COUPLING AMPLITUDES * PROJECTION CHAMBER * GAMMA-GAMMA
Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders
Impact factor: 3.416, year: 2010

We present a measurement of pi(+)pi(-)pi(+)pi(-) photonuclear production in ultraperipheral Au-Au collisions at root s(NN) = 200 GeV from the STAR experiment. The pi(+)pi(-)pi(+)pi(-) final states are observed at low transverse momentum and are accompanied by mutual nuclear excitation of the beam particles. The strong enhancement of the production cross section at low transverse momentum is consistent with coherent photoproduction. The pi(+)pi(-)pi(+)pi(-) invariant mass spectrum of the coherent events exhibits a broad peak around 1540 +/- 40 MeV/c(2) with a width of 570 +/- 60 MeV/c(2), in agreement with the photoproduction data for the rho(0)(1700). We do not observe a corresponding peak in the pi(+)pi(-) final state and measure an upper limit for the ratio of the branching fractions of the rho(0)(1700) to pi(+)pi(-) and pi(+)pi(-)pi(+)pi(-) of 2.5% at 90% confidence level.
Permanent Link: http://hdl.handle.net/11104/0185857