A search for associated production of a Z boson with an open charm meson is presented using a data sample, corresponding to an integrated luminosity of 1.0 fb(-1) of proton-proton collisions at a centre-of-mass energy of 7 TeV, collected by the LHCb experiment. Seven candidate events for associated production of a Z boson with a D-0 meson and four candidate events for a Z boson with a D+ meson are observed with a combined significance of 5.1 standard deviations. The production cross-sections in the forward region are measured to be sigma<INF>Z ->mu<SUP>+</SUP>mu<SUP>-</SUP>,D<SUP>0</SUP></INF> = 2.50 +/- 1.12 +/- 0.22 pb sigma<INF>Z ->mu<SUP>+</SUP>mu<SUP>-</SUP>,D<SUP>+</SUP></INF> = 0.44 +/- 0.23 +/- 0.03 pb, where the first uncertainty is statistical and the second systematic.

Observation of associated production of a Z boson with a D meson in the forward region

CENCI, RICCARDO;MARINO, PIETRO;MORELLO, MICHAEL JOSEPH;
2014

Abstract

A search for associated production of a Z boson with an open charm meson is presented using a data sample, corresponding to an integrated luminosity of 1.0 fb(-1) of proton-proton collisions at a centre-of-mass energy of 7 TeV, collected by the LHCb experiment. Seven candidate events for associated production of a Z boson with a D-0 meson and four candidate events for a Z boson with a D+ meson are observed with a combined significance of 5.1 standard deviations. The production cross-sections in the forward region are measured to be sigmaZ ->mu+mu-,D0 = 2.50 +/- 1.12 +/- 0.22 pb sigmaZ ->mu+mu-,D+ = 0.44 +/- 0.23 +/- 0.03 pb, where the first uncertainty is statistical and the second systematic.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11384/59573
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