Exclusive Photoproduction of 2pi+2pi- Final State at HERA

Reference April 2018
Document Conference paper or talk
Figures  (1a)  (1b)  (2)  (3a)  (3b)  (3c)  (3d)  (3e)  (3f)  (4)  (5)  (6)  (7a)  (7b)
Contact S. Levonian
Abstract Exclusive production of four charged pions at the ep collider HERA is studied at small photon virtualities Q^2 < 2 GeV^2. The data were taken with the H1 detector in the years 2006 and 2007 at a centre-of-mass energies of 319 GeV and 225 GeV and correspond to an integrated luminosity of 7.6 pb-1 and 1.7 pb-1 respectively. The cross section of the reaction gamma p -> (2pi+2pi-)Y is determined in the phase space of 35 < W < 100 GeV, |t| < 1 GeV2 and M_Y < 1.6 GeV. The 4pi mass spectra indicate that the reaction proceeds predominantly via production and decay of rho-prime resonances. The fit however does not allow yet to distinguish unambiguously between the hypothesis of one or two broad and overlapping rho-prime resonances.
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