Production of excited charm and charm-strange mesons at HERA
Abstract
The production of excited charm, D1(2420)0 and D2*(2460)0, and charm-strange, Ds1(2536)+-, mesons in ep collisions was measured with the ZEUS detector at HERA using an integrated luminosity of 126 pb-1. Masses, widths and helicity parameters were determined. The measured yields were converted to the rates of c quarks hadronising as a given excited charm meson and to the ratios of the dominant D2*(2460)0 and Ds1(2536)+- branching fractions. A search for the radially excited charm meson, D*'(2640)+-, was also performed. The results are compared with those measured previously and with theoretical expectations.
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