Measurement of the Drell{Yan triple-differential cross-section in pp collisions at ps = 8 TeV with the ATLAS detector
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This thesis presents the measurement and results of the Z=
! + �� Drell{Yan tripledi
erential cross-section, using 20:24 fb��1of ATLAS data recorded in 2012 at a centre-of-mass
energy of ps = 8TeV. The triple-differential cross-section is measured as a function of dimuon invariant
mass, m , dimuon rapidity, y , and lepton decay angle in the Collins-Soper frame, cos .
These dimensions provide sensitivity to the parton composition of the proton through the parton
density functions, PDFs, and the weak e ective mixing angle, sin2 e :
W , via the forward-backward
asymmetry, AFB. The measurement is performed on and around the Z-boson's invariant mass peak,
46 < m < 200 GeV, in a kinematic ducial volume of muon transverse momentum, pT > 20 GeV,
and muon pseudo-rapidity j j 2:4. The results are unfolded from the detector level to the Born,
bare and dressed levels, where a precision of < 0:6% is reported in the central bins. The data is
combined with an electron channel measurement resulting in a combined result with reduced total
uncertainty. The combined result is shown to constrain PDF uncertainties and achieve the most
constrained sin2 e :
W uncertainty yet reported at the LHC.
Authors
Armitage, LewisCollections
- Theses [4235]