Production of the excited charm mesons D1 and D*2 at HERA

H. Abramowicz; P. Kooijman; D.S. Zotkin

doi:10.1016/j.nuclphysb.2012.09.007

Production of the excited charm mesons D1 and D*2 at HERA

H. Abramowicz, P. Kooijman, D.S. Zotkin

Subatomic Physics

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Abstract

The production of the excited charm mesons D1(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 D1(2420)0 were determined and compared with other measurements and with theoretical expectations. The measured helicity parameter of the D0 1 allows for some mixing of S- and D-waves in its decay to D ∗± π ∓. 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 D1 and D ∗ 2 were measured and are consistent with those obtained in e + e − annihilations.

Original language	English
Pages (from-to)	229-254
Number of pages	26
Journal	Nuclear physics. Series B
Volume	866
Issue number	3
DOIs	https://doi.org/10.1016/j.nuclphysb.2012.09.007
Publication status	Published - 2013

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ZEUS Collaboration

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title = "Production of the excited charm mesons D1 and D*2 at HERA",

abstract = "The production of the excited charm mesons D1(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 D1(2420)0 were determined and compared with other measurements and with theoretical expectations. The measured helicity parameter of the D0 1 allows for some mixing of S- and D-waves in its decay to D ∗± π ∓. 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 D1 and D ∗ 2 were measured and are consistent with those obtained in e + e − annihilations.",

author = "H. Abramowicz and P. Kooijman and D.S. Zotkin",

note = "ZEUS Collaboration",

year = "2013",

doi = "10.1016/j.nuclphysb.2012.09.007",

language = "English",

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pages = "229--254",

journal = "Nuclear physics. Series B",

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TY - JOUR

T1 - Production of the excited charm mesons D1 and D*2 at HERA

AU - Abramowicz, H.

AU - Kooijman, P.

AU - Zotkin, D.S.

N1 - ZEUS Collaboration

PY - 2013

Y1 - 2013

N2 - The production of the excited charm mesons D1(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 D1(2420)0 were determined and compared with other measurements and with theoretical expectations. The measured helicity parameter of the D0 1 allows for some mixing of S- and D-waves in its decay to D ∗± π ∓. 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 D1 and D ∗ 2 were measured and are consistent with those obtained in e + e − annihilations.

AB - The production of the excited charm mesons D1(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 D1(2420)0 were determined and compared with other measurements and with theoretical expectations. The measured helicity parameter of the D0 1 allows for some mixing of S- and D-waves in its decay to D ∗± π ∓. 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 D1 and D ∗ 2 were measured and are consistent with those obtained in e + e − annihilations.

U2 - 10.1016/j.nuclphysb.2012.09.007

DO - 10.1016/j.nuclphysb.2012.09.007

M3 - Article

SN - 0550-3213

VL - 866

SP - 229

EP - 254

JO - Nuclear physics. Series B

JF - Nuclear physics. Series B

IS - 3

ER -

Production of the excited charm mesons D1 and D*2 at HERA

Abstract

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