scholarly journals Determination of the transverse momentum of W bosons in hadronic collisions via forward folding techniques

2016 ◽  
Vol 31 (14) ◽  
pp. 1650069
Author(s):  
Jakub Cuth ◽  
Kyrylo Merkotan ◽  
Matthias Schott ◽  
Samuel Webb
Keyword(s):  
Transverse Momentum ◽  
Z Boson ◽  
W Boson ◽  
W Bosons ◽  
Boson Mass ◽  
Final States ◽  
Transverse Momentum Spectrum ◽  
Systematic Uncertainties ◽  
Hadronic Collisions

The measurement of the transverse momentum of W bosons in hadron collisions provides not only an important test of quantum chromodynamic (QCD) calculations, but also is a crucial input for the precision measurement of the W boson mass. While the measurement of the Z boson transverse momentum is experimentally well under control, the available unfolding techniques for the W boson final states lead generically to relatively large uncertainties. In this paper, we present a new methodology to estimate the W boson transverse momentum spectrum, significantly improving the systematic uncertainties of current approaches.

scholarly journals Effect of flavor-dependent partonic transverse momentum on the determination of the W boson mass in hadronic collisions

2019 ◽  
Vol 788 ◽  
pp. 542-545 ◽  
Author(s):  
Alessandro Bacchetta ◽  
Giuseppe Bozzi ◽  
Marco Radici ◽  
Mathias Ritzmann ◽  
Andrea Signori
Keyword(s):  
Transverse Momentum ◽  
W Boson ◽  
Boson Mass ◽  
Hadronic Collisions

scholarly journals Nonperturbative Uncertainties on the Transverse Momentum Distribution of Electroweak Bosons and on the Determination of the W Boson Mass at the LHC

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Giuseppe Bozzi ◽  
Andrea Signori
Keyword(s):  
Transverse Momentum ◽  
W Boson ◽  
Direct Determination ◽  
Boson Mass ◽  
Proton Proton ◽  
Theoretical Predictions ◽  
Quark Transverse Momentum ◽  
The Impact ◽  
Proton Proton Collisions

In this contribution we present an overview of recent results concerning the impact of a possible flavour dependence of the intrinsic quark transverse momentum on electroweak observables. In particular, we focus on the qT spectrum of electroweak gauge bosons produced in proton-proton collisions at the LHC and on the direct determination of the W boson mass. We show that these effects are comparable in size to other nonperturbative effects commonly included in phenomenological analyses and should thus be included in precise theoretical predictions for present and future hadron colliders.

scholarly journals Electroweak measurements from W, Z and photon final states

2014 ◽  
Vol 31 ◽  
pp. 1460276
Author(s):  
Hang Yin ◽  
Keyword(s):  
Differential Cross Section ◽  
Cross Section ◽  
Z Boson ◽  
W Boson ◽  
Charge Asymmetry ◽  
Distribution Functions ◽  
Boson Mass ◽  
Electroweak Theory ◽  
Final States ◽  
Parton Distribution Functions

We present the most recent precision electroweak measurements of single W and Z boson cross section and properties from the LHC and Tevatron colliders, analyzing data collected by ATLAS, CDF, CMS, D0, and LHCb detectors. The results include the measurement of the single W and Z boson cross section at LHC, the differential cross section measurements, the measurement of W boson mass, the measurement of W and Z charge asymmetry. These measurements provide precision tests on the electroweak theory, high order predictions and the information can be used to constraint parton distribution functions.

scholarly journals Search for new physics in final states with an energetic jet or a hadronically decaying W or Z boson and transverse momentum imbalance at s=13  TeV

2018 ◽  
Vol 97 (9) ◽  
Author(s):  
A. M. Sirunyan ◽  
A. Tumasyan ◽  
W. Adam ◽  
F. Ambrogi ◽  
E. Asilar ◽  
...  
Keyword(s):  
Transverse Momentum ◽  
Z Boson ◽  
New Physics ◽  
Final States ◽  
Momentum Imbalance

Helicity of the W in Single-Lepton $t\bar{t}$ Events

2003 ◽  
Vol 18 (supp01) ◽  
pp. 304-319
Author(s):  
Florencia Canelli
Keyword(s):  
Maximum Likelihood ◽  
Maximum Likelihood Method ◽  
W Boson ◽  
W Bosons ◽  
Likelihood Method ◽  
Final States ◽  
Left Handed ◽  
Lepton Jets

We have developed a procedure to study the helicity of the W boson in [Formula: see text] events. Using events generated with the PYTHIA program at a top Mt = 175 GeV/c2, we employ a maximum likelihood method to extract the fraction of right-handed, longitudinal and left-handed W bosons in top decays. Assuming V–A coupling in the decay, we obtain a longitudinal fraction of 0.696±0.097 for 50 simulated experiments of 100 events in lepton+jets [Formula: see text] final states, a result that is consistent with the input fraction of 0.703.

CANCELLATION OF ULTRAVIOLET DIVERGENCES IN THE SU(2)L×U(1) ELECTROWEAK MODEL

1989 ◽  
Vol 04 (28) ◽  
pp. 2733-2738 ◽  
Author(s):  
ROGER DECKER ◽  
JEAN PESTIEAU
Keyword(s):  
Top Quark ◽  
Z Boson ◽  
Charged Lepton ◽  
W Boson ◽  
Boson Mass ◽  
Three Generations ◽  
Electroweak Model

We assume that, in the SU(2)L×U(1) model, ultraviolet divergences of the charged lepton self-masses are zero. We predict the top and Higgs masses in the vicinity of the Z-boson mass. Our assumption holds only if there are no more than three generations of quarks and leptons and if quarks and leptons, except for the top quark, have negligible masses compared to the W-boson mass.

scholarly journals MEASUREMENT OF THE W BOSON MASS AND WIDTH IN DELPHI AT LEP

2001 ◽  
Vol 16 (supp01a) ◽  
pp. 284-286 ◽  
Author(s):  
◽  
MARTIJN MULDERS
Keyword(s):  
W Boson ◽  
Center Of Mass ◽  
Final Analysis ◽  
Systematic Errors ◽  
Boson Mass ◽  
Delphi Collaboration ◽  
Delphi Analysis

A measurement of the W boson mass and width has been performed by the DELPHI collaboration. During the years 1997-1999 DELPHI collected data with an interrated luminosity of 435 pb-1 at center-of-mass energies ranging from 183 to 202 GeV. LEP is currently running at energies up to 208 GeV. The DELPHI analysis and preliminary numbers presented at ICHEP 2000, Osaka, are discussed and an overview is given of improvements in statistical sensitivity and determination of systematic errors to be expected for the final analysis of the total LEP2 data sample.

MEASUREMENT OF THE ANGULAR DISTRIBUTION OF ELECTRONS FROM W→eν DECAYS OBSERVED IN $p\bar p$ COLLISIONS AT $\sqrt{s} =1.8\, {\rm TeV}$

2001 ◽  
Vol 16 (supp01a) ◽  
pp. 318-321
Author(s):  
◽  
GEORG STEINBRÜCK
Keyword(s):  
Angular Distribution ◽  
Transverse Momentum ◽  
Perturbative Qcd ◽  
W Boson ◽  
Mass Measurement ◽  
Polar Angle ◽  
Distribution Parameter ◽  
Boson Mass ◽  
Leading Order ◽  
Proton Antiproton

We present the first measurement of the electron angular distribution parameter α2 in W → e ν events in proton-antiproton collisions as a function of the W boson transverse momentum. Our analysis is based on data collected using the DØ detector during the 1994–1995 Fermilab Tevatron run. We compare our results with next-to-leading order perturbative QCD, which predicts an angular distribution of (1 ± α1 cos θ* + α2 cos 2 θ*), where θ* is the polar angle of the electron in the Collins-Soper frame and α1 and α2 are functions of [Formula: see text], the W boson transverse momentum. This measurement provides a test of next-to-leading order QCD corrections which are a non-negligible contrbution to the W boson mass measurement.

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