Measurement of associated Z + charm production in proton-proton collisions at $\sqrt{s} = $ 8 TeV - INSPIRE

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Measurement of associated Z + charm production in proton-proton collisions at $\sqrt{s} =$ 8 TeV

CMS

Collaboration

Nov 6, 2017

50 pages

Published in:

Eur.Phys.J.C 78 (2018) 4, 287

Published: Apr 9, 2018

e-Print:

1711.02143 [hep-ex]

DOI:

10.1140/epjc/s10052-018-5752-x

Report number:

CMS-SMP-15-009,
CERN-EP-2017-257

Experiments:

CERN-LHC-CMS

View in:

reference search31 citations

Citations per year

Abstract: (Springer)

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.

Note:

Corrected the CERN-EP number. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/SMP-15-009/ (CMS Public Pages)

CMS
Physics
SMP
Vector boson
Heavy flavour
Standard model physics
p p: colliding beams
heavy quark: jet
channel cross section: measured
p p: scattering

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