Measurement of associated Z plus charm production in proton-proton collisions at root s=8TeV
A study of the associated production of a Z boson and a charm quark jet (Z + c), and a comparison to production with a b quark jet (Z + b), in pp collisions at a centre-of-mass energy of 8 TeV are presented. The analysis uses a data sample corresponding to an integrated luminosity of 19.7 fb−1, co...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English English |
| Published: |
Springer Verlag
2018
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/70402/ http://irep.iium.edu.my/70402/ http://irep.iium.edu.my/70402/ http://irep.iium.edu.my/70402/1/70402_Measurement%20of%20associated%20Z%20%2B%20charm%20production_new.pdf http://irep.iium.edu.my/70402/7/70402_Measurement%20of%20associated%20Z%20plus%20charm%20production_wos.pdf |
| Summary: | A study of the associated production of a Z boson
and a charm quark jet (Z + c), and a comparison to production with a b quark jet (Z + b), in pp collisions at a
centre-of-mass energy of 8 TeV are presented. The analysis uses a data sample corresponding to an integrated luminosity of 19.7 fb−1, collected with the CMS detector at the
CERN LHC. The 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 c or b flavoured hadrons and hadronic decays
of charm hadrons. The measurements are performed in the
kinematic region with two leptons with p
T > 20 GeV,
|η| < 2.1, 71 < m < 111 GeV, and heavy flavour jets
with p
jet
T > 25 GeV and |ηjet| < 2.5. The Z + c production
cross section is measured to be σ (pp → Z + c + X)B(Z →
+−) = 8.8±0.5 (stat)±0.6 (syst) pb. The ratio of the Z+c
and Z+b production cross sections is measured to be σ (pp →
Z+c+X)/σ (pp → Z+b+X) = 2.0±0.2 (stat)±0.2 (syst).
The Z+c production cross section and the cross section ratio
are also measured as a function of the transverse momentum
of the Z boson and of the heavy flavour jet. The measurements
are compared with theoretical predictions. |
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