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Production of the excited charm mesons D-1 and D-2 at HERA
Journal article   Peer reviewed

Production of the excited charm mesons D-1 and D-2 at HERA

H. Abramowicz, I. Abt, L. Adamczyk, M. Adamus, R. Aggarwal, S. Antonelli, P. Antonioli, A. Antonov, M. Arneodo, O. Arslan, …
Nuclear physics. B, Vol.866(3), pp.229-254
01/21/2013
DOI: 10.1016/j.nuclphysb.2012.09.007
url
https://arxiv.org/pdf/1208.4468View
Open Access

Abstract

The production of the excited charm mesons D-1 (2420) and D-2*(2460) in ep collisions has been measured with the ZEUS detector at HERA using an integrated luminosity of 373 pb(-1). The masses of the neutral and charged states, the widths of the neutral states, and the helicity parameter of D-1(2420)(0) were determined and compared with other measurements and with theoretical expectations. The measured helicity parameter of the D-1(0) allows for some mixing of S- and D-waves in its decay to D*(+/-)pi(-/+). The result is also consistent with a pure D-wave decay. Ratios of branching fractions of the two decay modes of the D-2*(2460)(0) and D-2*(2460)(+/-) states were measured and compared with previous measurements. The fractions of charm quarks hadronising into D-1 and D-2* were measured and are consistent with those obtained in e(+)e(-). annihilations. (C) 2012 Elsevier B.V. All rights reserved.
Physical Sciences Physics Physics, Particles & Fields Science & Technology

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