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.
Titolo: | Observation of associated production of a Z boson with a D meson in the forward region | |
Autori: | ||
Data di pubblicazione: | 2014 | |
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Digital Object Identifier (DOI): | http://dx.doi.org/10.1007/JHEP04(2014)091 | |
Handle: | http://hdl.handle.net/11384/59573 | |
Appare nelle tipologie: | 1.1 Articolo in rivista |