Production of the excited charm mesons D 1 and D 2* at HERA
(2013) Nuclear Physics, Section B — Vol. 866, n° 3, p. 229-254 (2013)
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- The production of the excited charm mesons D <inf>1</inf>(2420) and D2*(2460) in ep collisions has been measured with the ZEUS detector at HERA using an integrated luminosity of 373pb <sup>-1</sup>. The masses of the neutral and charged states, the widths of the neutral states, and the helicity parameter of D <inf>1</inf>(2420) <sup>0</sup> were determined and compared with other measurements and with theoretical expectations. The measured helicity parameter of the D10 allows for some mixing of S- and D-waves in its decay to D <sup>*±</sup>π <sup>Π</sup>. The result is also consistent with a pure D-wave decay. Ratios of branching fractions of the two decay modes of the D2*(2460)0 and D2*(2460)± states were measured and compared with previous measurements. The fractions of charm quarks hadronising into D <inf>1</inf> and D2* were measured and are consistent with those obtained in e <sup>+</sup>e <sup>-</sup> annihilations. © 2012 Elsevier B.V.
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Abramowicz, H., Abt, I., Adamczyk, L., Adamus, M., Aggarwal, R., Antonelli, S., Antonioli, P., Antonov, A., Arneodo, M., Arslan, O., Aushev, V., Aushev, Y., Bachynska, O., Bamberger, A., Barakbaev, A. N., Barbagli, G., Bari, G., Barreiro, F., Bartosik, N., et al. (2013). Production of the excited charm mesons D 1 and D 2* at HERA. Nuclear Physics, Section B, 866(3), 229-254. https://doi.org/10.1016/j.nuclphysb.2012.09.007 (Original work published 2013)