Measurements of W$^{\pm}$ and top-quark pair to Z-boson cross-section ratios at $\sqrt{s}$ = 13, 8, 7 TeV with the ATLAS detector

Trofymov, A.

doi:10.3204/PUBDB-2017-13967

Measurements of W $^{\pm}$ and top-quark pair to Z-boson cross-section ratios at $\sqrt{s}$ = 13, 8, 7 TeV with the ATLAS detector

A. Trofymov
(
- Hamburg U.
)

2017

212 pages

Supervisors:

Alexander Glazov
(
- DESY
)
,
Peter Schleper
(
- DESY
)

Thesis: PhD

Hamburg U.

(2017)

Published: 2017 in Hamburg
and
Published: 2017

DOI:

10.3204/PUBDB-2017-13967

Experiments:

CERN-LHC-ATLAS

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Abstract: (Deutsches Elektronen-Synchrotron)

Measurements of the Z

\rightarrow

l

^{+}

l

^{-}

production cross sections, where l

\pm

= e

^{\pm}

,

\mu

^{\pm}

µ±, in proton- proton collisions at

\sqrt{S}

= 13 TeV are presented using two sets of data recorded by the ATLAS experiment at the Large Hadron Collider. The data sets correspond to a total integrated luminosity of 81 pb

^{-1}

and 3.2 fb

^{-1}

collected in 2015 using the 50 ns and 25 ns bunch spacing conﬁgurations, respectively. The cross section obtained with 50 ns conﬁguration is used for W ± to Z cross-section ratio measurement. The W

^{+}

to W

^{-}

boson production cross-section ratio is also measured. The ratios of measured ﬁducial cross sections for electron and muon decay channels of the W ± and Z boson are evaluated and compared to the Standard Model expectations of the lepton universality. Ratio of top-quark pair to Z-boson production cross section is measured at

\sqrt{S}

= 13 TeV using 25 ns bunch spacing data. Similar ratios are obtained at

\sqrt{S}

= 8 TeV and 7 TeV using the published ATLAS results corrected to a common phase space. Single ratios, at a given

\sqrt{S}

for the two processes and at different

\sqrt{S}

for each process, as well as double ratios of the two processes at different

\sqrt{S}

, are evaluated. The results are compared to cal- culations performed at next-to-next-to-leading-order accuracy using recent sets of parton distribution functions. The data used for t

\bar{t}

to Z-boson cross section ratios demonstrate signiﬁcant power to constrain the gluon distribution function for the Bjorken-x values near 0.1 and the light-quark sea for x < 0.02.

thesis
p p: scattering
p p: colliding beams
top: pair production
W: associated production
Z0: hadroproduction
Z0: leptonic decay
cross section: ratio
channel cross section: measured
energy dependence

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Figures(0)

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