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• W2768046645 abstract "A study of the associated production of a $$mathrm{Z} $$ boson and a charm quark jet ( $$mathrm{Z} + mathrm{c} $$ ), and a comparison to production with a $$mathrm{b} $$ quark jet ( $$mathrm{Z} + mathrm{b} $$ ), in $$mathrm {p}mathrm {p}$$ collisions at a centre-of-mass energy of 8 $$,text {TeV}$$ are presented. The analysis uses a data sample corresponding to an integrated luminosity of 19.7 $$,text {fb}^{-1}$$ , collected with the CMS detector at the CERN LHC. The $$mathrm{Z} $$ boson candidates are identified through their decays into pairs of electrons or muons. Jets originating from heavy flavour quarks are identified using semileptonic decays of $$mathrm{c} $$ or $$mathrm{b} $$ flavoured hadrons and hadronic decays of charm hadrons. The measurements are performed in the kinematic region with two leptons with $$p_{mathrm {T}} ^{ell } > 20,text {GeV} $$ , $${|eta ^{ell }|} < 2.1$$ , $$71< m_{ell ell } < 111,text {GeV} $$ , and heavy flavour jets with $$p_{mathrm {T}} ^{text {jet}} > 25,text {GeV} $$ and $${|eta ^{ text {jet}}|} < 2.5$$ . The $$mathrm{Z} + mathrm{c} $$ production cross section is measured to be $$sigma (mathrm {p}mathrm {p}rightarrow mathrm{Z} + mathrm{c} + X) mathcal {B}(mathrm{Z} rightarrow ell ^+ell ^-) = 8.8 pm 0.5,text {(stat)} pm 0.6,text {(syst)} ,text {pb} $$ . The ratio of the $$mathrm{Z} + mathrm{c} $$ and $$mathrm{Z} + mathrm{b} $$ production cross sections is measured to be $$sigma (mathrm {p}mathrm {p}rightarrow mathrm{Z} + mathrm{c} + X)/sigma (mathrm {p}mathrm {p}rightarrow mathrm{Z} + mathrm{b} + X) = 2.0 pm 0.2,text {(stat)} pm 0.2,text {(syst)} $$ . The $$mathrm{Z} + mathrm{c} $$ production cross section and the cross section ratio are also measured as a function of the transverse momentum of the $$mathrm{Z} $$ boson and of the heavy flavour jet. The measurements are compared with theoretical predictions." @default.
• W2768046645 created "2017-11-17" @default.
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