Download or read book Measurement of the W Boson Production Charge Asymmetry in P bar p Collisions written by and published by . This book was released on 2008 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a measurement of the W boson production charge asymmetry using the W → ev decay channel. We use data collected the Collider Detector at Fermilab (CDF) from p$ar{p}$ collisions at √s = 1.96 TeV. The data were collected up to February 2006 (Run II) and represent an integrated luminosity of 1 fb-1. The experimental measurement of W production charge asymmetry is compared to higher order QCD predictions generated using MRST2006 and CTEQ6 parton distribution functions (PDF). The asymmetry provides new input on the momentum fraction dependence of the u and d quark parton distribution functions (PDF) within the proton over the fraction of proton's momentum range from 0.002 x 0.8 corresponding to -3.0 ysubW/sub 3.0 at Qsup2/sup ̃M

Download or read book Measurement of the W Boson Production Charge Asymmetry in P Pbar Collisions written by and published by . This book was released on 2008 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a measurement of the W boson production charge asymmetry using the W → e[nu] decay channel. We use data collected the Collider Detector at Fermilab (CDF) from p{bar p} collisions at √s = 1.96 TeV. The data were collected up to February 2006 (Run II) and represent an integrated luminosity of 1 fb−1. The experimental measurement of W production charge asymmetry is compared to higher order QCD predictions generated using MRST2006 and CTEQ6 parton distribution functions (PDF). The asymmetry provides new input on the momentum fraction dependence of the u and d quark parton distribution functions (PDF) within the proton over the fraction of proton's momentum range from 0.002

Download or read book The Charge Asymmetry in W Boson Production in p bar P Collisions at the sqrt s written by and published by . This book was released on 2009 with total page 203 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a measurement of the W boson charge asymmetry in p $\bar{p}$ collisions using W →ev decays using 750 pb-1 of data collected with the D detector at the Fermilab Tevatron. The electron coverage is extended to.

Download or read book Direct Measurement of the W Production Charge Asymmetry in P Anti p Collisions at S 1 2 written by and published by . This book was released on 2009 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present the first direct measurement of the W production charge asymmetry as a function of the W boson rapidity y{sub W} in p{bar p} collisions at √s = 1.96 TeV. We use a sample of W → e[nu] events in data from 1 fb−1 of integrated luminosity collected using the CDF II detector. In the region

Download or read book The Charge Asymmetry in W Bosons Produced in P Anti p Collisions at Center of Mass Energy 1 96 TeV written by Julie M. Torborg and published by . This book was released on 2005 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary mode of production of W{sup +} bosons in a p{bar p} collider is u + {bar d} {yields} W{sup +}. The u quark generally carries more momentum than the {bar d} and the resultant W{sup +} tends to be boosted in the proton direction. Similarly, W bosons are boosted in the anti-proton direction. This is observed as an asymmetry in the rapidity distributions of positive and negative W bosons. Measurement of this asymmetry serves as a probe of the momentum distribution of partons within the proton. These distributions are required as input to the calculation of every p{bar p} production cross section. This thesis presents the first measurement at D0 of the charge asymmetry of the W boson production cross section as measured in W {yields} ev decays in 0.3 fb{sup -1} of p{bar p} collisions collected with the D0 Detector. Theoretical predictions made using the CTEQ6.1M and MRST(2004) parton distribution functions are compared with the measurement.

Download or read book The Charge Asymmetry in W Bosons Produced in P bar p Collisions at u221A s written by and published by . This book was released on 2005 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary mode of production of W+ bosons in a p$ar{p}$ collider is u + $ar{d}$ → W+. The u quark generally carries more momentum than the $ar{d}$ and the resultant W+ tends to be boosted in the proton direction. Similarly, W bosons are boosted in the anti-proton direction. This is observed as an asymmetry in the rapidity distributions of positive and negative W bosons. Measurement of this asymmetry serves as a probe of the momentum distribution of partons within the proton. These distributions are required as input to the calculation of every p$ar{p}$ production cross section. This thesis presents the first measurement at D0 of the charge asymmetry of the W boson production cross section as measured in W → ev decays in 0.3 fb-1 of p$ar{p}$ collisions collected with the D0 Detector. Theoretical predictions made using the CTEQ6.1M and MRST(2004) parton distribution functions are compared with the measurement.

Download or read book Measurement of the W Boson Production Charge Asymmetry in Pp Collisions written by Bo-Young Han and published by . This book was released on 2008 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurement of the W Boson Production Charge Asymmetry in Pp u00AF u2192 W X u2192 e X Events at S written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a measurement of the W boson production charge asymmetry in p$ar{p}$→W+X→e?+X events at a center of mass energy of 1.96 TeV, using 9.7 fb-1 of integrated luminosity collected with the D0 detector at the Fermilab Tevatron Collider. The neutrino longitudinal momentum is determined by using a neutrino weighting method, and the asymmetry is measured as a function of the W boson rapidity. The measurement extends over wider electron pseudorapidity region than previous results and is the most precise to date, allowing for precise determination of proton parton distribution functions in global fits.

Download or read book Measurement of the W Charge Asymmetry in the Pp Collisions at arrow written by and published by . This book was released on 2011 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: This letter reports a measurement of the muon charge asymmetry from W Boson produced in proton-proton collisions at a centre-of-mass energy of 7 TeV with the ATLAS experiment at the LHC. The asymmetry is measured in the W → [mu][nu] decay mode as a function of the muon pseudorapidity using a data sample corresponding to a total integrated luminosity of 31 pb-1. The results are compared to predictions based on next-to-leading order calculations with various parton distribution functions. The measurement provides information on the u and d quark momentum fractions in the proton.

Download or read book A Study of W Boson Decay Charge Asymmetry Using Hadronic Tau Decays in Proton Anti proton Collisions at square Root s written by and published by . This book was released on 2002 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation presents a measurement of the tau charge asymmetry in events where the taus are produced by W decays. This charge asymmetry appears as different rapidity distributions for positive and negative taus. Two competing effects generate tau charge asymmetry. The production mechanism for the W gauge boson generates a charge asymmetry which is a function of the ratio of parton distribution functions, d(x)=u(x), measured at x (almost equal to) M{sub W}/(square root)s. This is the dominant effect for tau charge asymmetry at small rapidity. At higher rapidity, however, the competing charge asymmetry from parity violation in W decay to taus becomes dominant. This tau asymmetry measurement is consistent with the Standard Model with a x2 per degree of freedom equal to 2.5 for 4 degrees of freedom when the asymmetry measurement is folded about y = 0, taking advantage of the CP symmetry of the underlying physics, and 8.9 for 8 degrees of freedom when it is not. This measurement introduces some methods and variables of interest to future analyses using hadronic decay modes of taus. This work was done using the CDF detector in {bar p}p collisions at (square root) = 1.8 TeV at Fermilab's Tevatron accelerator.

Download or read book A Study of W Boson Decay Charge Asymmetry Using Hadronic Tau Decays in Proton Anti proton Collisions at u221A s written by and published by . This book was released on 1998 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation presents a measurement of the tau charge asymmetry in events where the taus are produced by W decays. This charge asymmetry appears as different rapidity distributions for positive and negative taus. Two competing effects generate tau charge asymmetry. The production mechanism for the W gauge boson generates a charge asymmetry which is a function of the ratio of parton distribution functions, d(x)=u(x), measured at x ̃MW/√s. This is the dominant effect for tau charge asymmetry at small rapidity. At higher rapidity, however, the competing charge asymmetry from parity violation in W decay to taus becomes dominant. This tau asymmetry measurement is consistent with the Standard Model with a x2 per degree of freedom equal to 2.5 for 4 degrees of freedom when the asymmetry measurement is folded about y = 0, taking advantage of the CP symmetry of the underlying physics, and 8.9 for 8 degrees of freedom when it is not. This measurement introduces some methods and variables of interest to future analyses using hadronic decay modes of taus. This work was done using the CDF detector in $ar{p}$p collisions at √s = 1.8 TeV at Fermilab's Tevatron accelerator.

Download or read book W charge Asymmetry at CDF Tests of Structure Functions written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The charge asymmetry of W-bosons produced in p[bar p] collisions has been measured using 19,039 W [yields] e[nu] and W [yields] [mu][nu] decays recorded by the CDF detector during the 1992-93 Tevatron collider run. The asymmetry is sensitive to the slope of the proton's d/u quark distribution ratio down to x

Download or read book Measurement of the W Charge Asymmetry in the pp Collisions at u221A s written by and published by . This book was released on 2011 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: This letter reports a measurement of the muon charge asymmetry from W Boson produced in proton-proton collisions at a centre-of-mass energy of 7 TeV with the ATLAS experiment at the LHC. The asymmetry is measured in the W → ?? decay mode as a function of the muon pseudorapidity using a data sample corresponding to a total integrated luminosity of 31 pb-1. The results are compared to predictions based on next-to-leading order calculations with various parton distribution functions. The measurement provides information on the u and d quark momentum fractions in the proton.

Download or read book Measurement of the W Boson Charge Asymmetry in Proton proton Collisions at Sqrts written by Tai-Hua Lin and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurement of the Charge of Asymmetry of W Bosons Produced in Pp Collisions at SQRT S written by Verena Ingrid Martinez Outschoorn and published by . This book was released on 2011 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurement of the Cross Section for W boson Production in Association with Jets in Ppbar Collisions at S written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a measurement of the cross section for W-boson production in association with jets in p{bar p} collisions at √s = 1.96 TeV. The analysis uses a data sample corresponding to an integrated luminosity of 320 pb−1 collected with the CDF II detector. W bosons are identified in their electron decay channel and jets are reconstructed using a cone algorithm. For each W + ≥ n-jet sample (n = 1-4) we measure?(p{bar p} → W + ≥ n-jet) x?(W → e?) with respect to the transverse energy E{sub T} of the nth-highest E{sub T} jet above 20 GeV, for a restricted W → e? decay phase space. The cross sections, corrected for all detector effects, can be directly compared to particle level W + jet(s) predictions. We present here comparisons to leading order and next-to-leading order predictions.

Download or read book First Measurement of the Production of a W Boson in Association with a Single Charm Quark in P Anti p Collisions at S 1 2 written by and published by . This book was released on 2007 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present the first measurement of the production cross section of a W boson with a single charm quark (c) in p{bar p} collisions at √s = 1.96 TeV, using soft muon tagging of c jets. In a data sample of ≈ 1.8 fb−1, recorded with the CDF II detector at the Fermilab Tevatron, they select events with W + 1 or 2 jets. They use the charge correlation between the W and the muon from the semileptonic decay of a charm hadron to extract the We signal. They measure [sigma]{sub Wc} (p{sub Tc} > 20 GeV/c,