Precise Study of the $Z/\gamma^*$ Boson Transverse Momentum Distribution in $p\bar{p}$ Collisions Using a Novel Technique PDF Download
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Author: Publisher: ISBN: Category : Languages : en Pages : 12
Book Description
Using 7.3 fb−1 of p{bar p} collisions collected by the D0 detector at the Fermilab Tevatron, we measure the distribution of the variable [phi]*{sub {eta}}, which probes the same physical effects as the Z/[gamma]* boson transverse momentum, but is less susceptible to the effects of experimental resolution and efficiency. A QCD prediction is found to describe the general features of the [phi]*{sub {eta}} distribution, but is unable to describe its detailed shape or dependence on boson rapidity. A prediction that includes a broadening of transverse momentum for small values of the parton momentum fraction is strongly disfavored.
Author: Publisher: ISBN: Category : Languages : en Pages : 12
Book Description
Using 7.3 fb−1 of p{bar p} collisions collected by the D0 detector at the Fermilab Tevatron, we measure the distribution of the variable [phi]*{sub {eta}}, which probes the same physical effects as the Z/[gamma]* boson transverse momentum, but is less susceptible to the effects of experimental resolution and efficiency. A QCD prediction is found to describe the general features of the [phi]*{sub {eta}} distribution, but is unable to describe its detailed shape or dependence on boson rapidity. A prediction that includes a broadening of transverse momentum for small values of the parton momentum fraction is strongly disfavored.
Author: Publisher: ISBN: Category : Languages : en Pages : 264
Book Description
Two analyses are performed with the large samples of dielectron and dimuon events collected by the D0 experiment at the Fermilab Tevatron $p\bar{p}$ collider. The dilepton transverse momentum ($p_T$) distribution in $Z/\gamma^* → \ell^+\ell^-$ production is a powerful probe of Quantum chromodynamics. Until now, this distribution has been measured with limited precision. An alternative variable, $\phi^*_\eta$, is proposed due to its relatively low susceptibility to detector effects. The $\phi^*_\eta$, distribution of events with $Z/\gamma^* → \ell^+\ell^-$ invariant masses between 70 and 110 GeV, is measured in three bins of dilepton rapidity. This measurement, with 7.3 fb$^{-1}$ of data, is significantly more precise than previous measurements of the $p_T$ distribution. A state-of-the-art QCD Monte Carlo program is in modest agreement with the data. Using 8.6 fb$^{-1}$ of data, the $ZZ/\gamma^* → \nu\bar{\nu}\ell^+\ell^-$ and $WZ/\gamma^* → \ell\nu\ell^+\ell^-$ processes are studied, yielding production cross sections of, $\sigma(p\bar{p} \rightarrow ZZ/\gamma^*)$ = 1.64 $\pm$ 0.46 p b and $\sigma(p\bar{p} \rightarrow WZ/\gamma^*)$ = 4.46 $\pm$ 0.64 pb, for $Z/\gamma^* → \ell^+\ell^-$ invariant masses between 60 and 130 GeV. These are in agreement with Standard Model predictions.
Author: Publisher: ISBN: Category : Languages : en Pages : 142
Book Description
This dissertation describes a measurement of the shape of the boson transverse momentum distribution in p{bar p} 2!Z/[gamma]* 2!ee− + X events at a center-of-mass energy of 1.96 TeV. The measurement is made for events with electron-positron mass between 70
Author: Publisher: ISBN: Category : Languages : en Pages : 13
Book Description
The transverse momentum distributions of W and Z bosons produced in p{anti p} collisions at (square root)s = 1.8 TeV are measured with the D0 detector at Fermilab. The results are compared to QCD calculations which include soft gluon resummation. The transverse momentum distribution of the Z boson is consistent with the calculation of Ladinsky and Yuan, and is used to extract their non-perturbative parameter 92-
Author: Publisher: ISBN: Category : Languages : en Pages : 22
Book Description
The production of Z bosons in pPb collisions at √sNN = 5.02TeV is studied by the CMS experiment via the electron and muon decay channels. The inclusive cross section is compared to pp collision predictions, and found to scale with the number of elementary nucleon-nucleon collisions. The differential cross sections as a function of the Z boson rapidity and transverse momentum are measured. Though they are found to be consistent within uncertainty with theoretical predictions both with and without nuclear effects, the forward-backward asymmetry suggests the presence of nuclear effects at large rapidities. These results provide new data for constraining nuclear parton distribution functions.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
We present measurements of the transverse momentum distribution of W and Z bosons produced in p{bar p} collisions at (square root)s = 1.8 TeV. The data were collected with the DO detector at Fermilab during 1994-1996 Tevatron run. The results are in good agreement with theoretical predictions based on the perturbative QCD and soft gluon resummation combined calculation over the entire measured p{sub T} range (p{sub T} = 0--200 GeV/c).
Author: Joseph A. Gartner Publisher: ISBN: Category : Languages : en Pages :
Book Description
ABSTRACT: This dissertation describes the full details of 2 studies of Z0 bosons performed using the Compact Muon Solenoid detector at the Large Hadron Collider of proton on proton collisions with center of mass energy of 7TeV. The first study searches for physics beyond the Standard Model by looking for an excess in production of Z0 bosons by examining the Z0pT spectrum. As no excess is found, limits on new physics models are presented as a function of mass and other free parameters. The second study focuses on a precision measurement of the Z0pT distribution, and is compared to theoretical calculations for the purposes of testing high order QCD calculations in addition to probing the predictions of various tunes of the underlying event.
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Author: ![Measurement of the Z Boson Transverse Momentum Distribution in Pp̄ Collisions at [square Root]s PDF](https://books.google.com/books/content/images/frontcover/KQMHOAAACAAJ?fife=w80-h100)
Author: Zhi-Yu Jiang
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Author: Karl Klemens Müller
Author: Johnny Shing Tung Ng
Author: Joseph A. Gartner