The production of D ∗ and D mesons in inelastic scattering of 160 GeV/c muons off a 6LiD target has been investigated with the COMPASS spectrometer at CERN for 0.003 (GeV/c)2<Q 2<10 (GeV/c)2 and 3×10−5<x Bj <0.1. The study is based on 8100 events where a D 0 or $\bar{D}^{0}$ is detected subsequently to a D ∗+ or D ∗− decay, and on 34000 events, where only a D 0 or $\bar{D}^{0}$ is detected. Kinematic distributions of D ∗, D and $K_{2}^{*} (1430)$ are given as a function of their energy E, transverse momentum p T , energy fraction z, and of the virtual photon variables ν, Q 2 and x Bj . Semi-inclusive differential D ∗ production cross-sections are compared with theoretical predictions for D ∗ production via photon–gluon fusion into open charm. The total observed production cross-section for D ∗± mesons with laboratory energies between 22 and 86 GeV is (1.9±0.4) nb. Significant cross-section asymmetries are observed between D ∗+ and D ∗− production for ν<40 GeV and z>0.6.

D∗ and D meson production in muon nucleon interactions at 160 GeV/c

BIRSA, RENATO;BRADAMANTE, FRANCO;BRESSAN, Andrea;DUIC, VENICIO;ELIA, CARMINE;GIORGI, MARCELLO;LEVORATO, STEFANO;Makke, Nour;MARTIN, ANNA;PESARO, GIULIA;SBRIZZAI, GIULIO;SCHIAVON, PAOLO;SOZZI, FEDERICA;
2012

Abstract

The production of D ∗ and D mesons in inelastic scattering of 160 GeV/c muons off a 6LiD target has been investigated with the COMPASS spectrometer at CERN for 0.003 (GeV/c)20.6.
http://link.springer.com/article/10.1140%2Fepjc%2Fs10052-012-2253-1
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2648075
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