Measurement of the Forward-Backward Asymmetry in $\gamma/Z$ Boson to Dilepton Events in Compact Muon Solenoid at a Center-of-mass Energy of 7 TeV. PDF Download

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Measurement of the Forward-Backward Asymmetry in $\gamma/Z$ Boson to Dilepton Events in Compact Muon Solenoid at a Center-of-mass Energy of 7 TeV.

Measurement of the Forward-Backward Asymmetry in $\gamma/Z$ Boson to Dilepton Events in Compact Muon Solenoid at a Center-of-mass Energy of 7 TeV. PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 89

Book Description
The forward-backward asymmetry parameter ($A_{\rm FB}$) as a function of dilepton invariant mass in $Z / \gamma^* \rightarrow l^+l^-$ ($l$=$e$ or $\mu$) at $\sqrt{s}$=7 TeV is measured using 2.2 fb$^{-1}$ of $pp$ collision data in 2011. The uncorrected (raw) $A_{\rm FB}$ and the corrected (unfolded) $A_{\rm FB}$ is performed in a wide mass range between 40 GeV/$c^{2}$ to 1000 GeV/$c^{2}$, and comparative studies and correction techniques with simulation are described in detail. We measure raw $A_{\rm FB}$ for the first time in a large rapidity range of 3 $>

Measurement of the Forward-Backward Asymmetry in $\gamma/Z$ Boson to Dilepton Events in Compact Muon Solenoid at a Center-of-mass Energy of 7 TeV.

Measurement of the Forward-Backward Asymmetry in $\gamma/Z$ Boson to Dilepton Events in Compact Muon Solenoid at a Center-of-mass Energy of 7 TeV. PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 89

Book Description
The forward-backward asymmetry parameter ($A_{\rm FB}$) as a function of dilepton invariant mass in $Z / \gamma^* \rightarrow l^+l^-$ ($l$=$e$ or $\mu$) at $\sqrt{s}$=7 TeV is measured using 2.2 fb$^{-1}$ of $pp$ collision data in 2011. The uncorrected (raw) $A_{\rm FB}$ and the corrected (unfolded) $A_{\rm FB}$ is performed in a wide mass range between 40 GeV/$c^{2}$ to 1000 GeV/$c^{2}$, and comparative studies and correction techniques with simulation are described in detail. We measure raw $A_{\rm FB}$ for the first time in a large rapidity range of 3 $>

Z Boson Asymmetry Measurements at the Tevatron

Z Boson Asymmetry Measurements at the Tevatron PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

Book Description
We present measurements of the forward-backward asymmetry (A_fb) in dilepton pair decays of Z bosons produced in ppbar collisions using the full Tevatron dataset. The CDF experiment extracts a value for the effective weak mixing angle parameter sin^{2}\theta^{l}_{eff} of 0.2315 +/- 0.0010 from the A_fb distribution of dimuon events in 9.2 fb^{-1} of integrated luminosity. From dielectron events in 9.7 fb^{-1} of data, the D0 experiment finds sin^{2}\theta^{l}_{eff} = 0.23106 +/- 0.00053, the world's most precise measurement of sin^{2}\theta^{l}_{eff} from hadron colliders and with light quark couplings.

The Study of the Z Boson Transverse Momentum Spectrum Recorded by the Compact Muon Solenoid from 2010 Large Hadron Collider Data

The Study of the Z Boson Transverse Momentum Spectrum Recorded by the Compact Muon Solenoid from 2010 Large Hadron Collider Data PDF 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.

A Precise Measurement of the Left-right Asymmetry of Z Boson Production at the SLAC Linear Collider

A Precise Measurement of the Left-right Asymmetry of Z Boson Production at the SLAC Linear Collider PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 173

Book Description
We present a precise measurement of the left-right cross section asymmetry of Z boson production (A{sub LR}) observed in 1993 data at the SLAC linear collider. The A{sub LR} experiment provides a direct measure of the effective weak mixing angle through the initial state couplings of the electron to the Z. During the 1993 run of the SLC, the SLD detector recorded 49,392 Z events produced by the collision of longitudinally polarized electrons on unpolarized positrons at a center-of-mass energy of 91.26 GeV. A Compton polarimeter measured the luminosity-weighted electron polarization to be (63.4±1.3)%. ALR was measured to be 0.1617±0.0071(stat.)±0.0033(syst.), which determines the effective weak mixing angle to be sin 2?{sub W}{sup eff} = 0.2292±0.0009(stat.)±0.0004(syst.). This measurement of A{sub LR} is incompatible at the level of two standard deviations with the value predicted by a fit of several other electroweak measurements to the Standard Model.

Precision Matters: Measurement of the W Boson Mass and Width with the ATLAS Detector at a Centre-of-mass Energy of 7 TeV and the Activity of the Underlying Event in Z Boson Events at a Centre-of-mass Energy of 13 TeV

Precision Matters: Measurement of the W Boson Mass and Width with the ATLAS Detector at a Centre-of-mass Energy of 7 TeV and the Activity of the Underlying Event in Z Boson Events at a Centre-of-mass Energy of 13 TeV PDF Author: Lennart Adam
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

Book Description

A Precise Measurement of the Left-right Cross Section Asymmetry in Z Boson Production

A Precise Measurement of the Left-right Cross Section Asymmetry in Z Boson Production PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

Book Description
The thesis presents a measurement of the left-right asymmetry, A[sub LR], n the production cross section of Z Bosons produced by e[sup+]e[sup -] annihilations, using polarized electrons, at a center of mass energy of 91.26 Gev. The data presented was recorded by the SLD detector at the SLAC Linear Collider during the 1993 run. The mean luminosity-weighted polarization of the electron beam was[rho][sup lum]= (63.0[+-]1.1)%. Using a sample of 49,392 Z events, we measure A[sub LR] to be 0.1626[+-]0.0071(stat)[+-]0.0030(sys.), which determined the effective weak mixing angle to be sin[sup 2][theta][sub W][sup eff]= 0.2292[+-]0.0009(stat.)[+-]0.0004(sys.). This result differs from that expected by the Standard Model of Particles and Fields by 2.5 standard deviations.

Forward-backward Asymmetries in W and Z Decays

Forward-backward Asymmetries in W and Z Decays PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

Book Description
The leptons emitted in decays of W and Z bosons produced in pp or anti pp collisions exhibit characteristic asymmetries with respect to the beam direction, as measured in the W or Z center-of-mass. The asymmetries appear in both pp and anti pp collisions. For anti pp collisions they appear to be approximately constant over the whole y range for values of M/.sqrt.s greater than or equal to 0.1. For smaller values of M/.sqrt.s, the asymmetries become more and more washed out in the central region as sea-sea collisions begin to play a larger role in gauge boson formation.

Measurement of the Shape of the Boson Rapidity Distribution for $p\bar{p} \rightarrow Z/\gamma^{*} \rightarrow E^{+}e^{-} + X$ Events Produced at $\sqrt{s}

Measurement of the Shape of the Boson Rapidity Distribution for $p\bar{p} \rightarrow Z/\gamma^{*} \rightarrow E^{+}e^{-} + X$ Events Produced at $\sqrt{s} PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 205

Book Description
The measurement of the shape of the boson rapidity distribution for p $\bar{p}$ 2!Z/[gamma]* 2!e+e- + X events at a center-of-mass energy of 1.96 TeV is presented in this thesis. Data, with an integrated luminosity of L = 9.86 fb-1, collected with the D0 detector during the whole RunII data taking period of the Fermilab Tevatron p$\bar{p}$ collider has been used. The measurement is made for events with electron-positron mass 66

Compact Muon Solenoid Experiment Discovery Potential for Supersymmetry in Same-charge Di-lepton Events

Compact Muon Solenoid Experiment Discovery Potential for Supersymmetry in Same-charge Di-lepton Events PDF Author: Yuriy Aleksandrovich Pakhotin
Publisher:
ISBN:
Category :
Languages : en
Pages :

Book Description
ABSTRACT: Same-charge di-lepton events provide a very clean experimental signature for Supersymmetry (SUSY) search. This work studies the Compact Muon Solenoid (CMS) experiment search potential for new physics with same-charge, isolated di-leptons accompanied by jets and large missing transverse energy. The results show that CMS sensitivity for new physics at 7 TeV with integrated luminosity 100 pb ... 1 will exceed current Tevatron limits. Muon detection for SUSY discovery in the forward direction is accomplished using cathode strip chambers (CSC). These detectors identify muons, provide a fast muon trigger, and give a precise measurement of the muon trajectory. There are 468 six-plane CSCs in the system. The efficiency of finding muon trigger primitives (muon track segments) was studied using 36 CMS CSCs and cosmic ray muons during the Magnet Test and Cosmic Challenge (MTCC) exercise conducted by the CMS experiment in 2006. The efficiency of finding 2-dimensional trigger primitives within 6-layer chambers was found to be 99.93 ± 0.03%.

Measurement of the Angular Coefficients in Z-boson Events Using Electron and Muon Pairs from Data Taken at $ \sqrt{s}

Measurement of the Angular Coefficients in Z-boson Events Using Electron and Muon Pairs from Data Taken at $ \sqrt{s} PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 101

Book Description
The angular distributions of Drell-Yan charged lepton pairs in the vicinity of the Z-boson mass peak probe the underlying QCD dynamics of Z-boson production. This paper presents a measurement of the complete set of angular coefficients A0-7 describing these distributions in the Z-boson Collins-Soper frame. The data analysed correspond to 20.3 fb-1 of pp collisions at √s = 8 TeV, collected by the ATLAS detector at the CERN LHC. The measurements are compared to the most precise fixed-order calculations currently available (O([alpha]2s)) and with theoretical predictions embedded in Monte Carlo generators. The measurements are precise enough to probe QCD corrections beyond the formal accuracy of these calculations and to provide discrimination between different parton-shower models. A significant deviation from the (O([alpha]2s)) predictions is observed for A0 - A2. In conclusion, evidence is found for non-zero A5,6,7, consistent with expectations.
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