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

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 $1.0\,\mathrm{fb}^{-'}$ 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 5.1standard deviations. The production cross-sections in the forward region are measured to be $\sigma_{Z\rightarrow\mu^+\mu^-\!,D^0} = 2.50\pm1.12\pm0.22pb$ $\sigma_{Z\rightarrow\mu^+\mu^-\!,D^+} = 0.44\pm0.23\pm0.03pb,$ where the first uncertainty is statistical and the second systematic.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00931171
Contributor : Danielle Cristofol <>
Submitted on : Wednesday, January 15, 2014 - 9:07:59 AM
Last modification on : Monday, July 26, 2021 - 4:12:02 PM

### Citation

R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Ziad Ajaltouni, et al.. Observation of associated production of a $Z$ boson with a $D$ meson in the~forward region. Journal of High Energy Physics, Springer, 2014, 04, pp.091. ⟨10.1007/JHEP04(2014)091⟩. ⟨in2p3-00931171⟩

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