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Download or read book Combination of CDF and D0 $W$-Boson Mass Measurements written by and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 11 pages
Book Rating : 4.:/5 (873 download)
Download or read book Combination of CDF and D0 Results on the W Boson Mass and Width written by and published by . This book was released on 2008 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: The results on the direct measurements of the W-boson mass and width, based on the data collected by the Tevatron experiments CDF and D− at Fermilab are summarized and combined. The CDF Run-0 (1988-1889) and Run-I (1992-1995) results have been re-averaged using the BLUE method and combined with Run-I D− results and the latest published results from CDF taken from the first period of Run-II (2001-2004). The results are corrected to have consistency between the parton distribution functions and electroweak parameters. The resulting Tevatron averages for the mass and total decay width of the W boson are: M{sub W} = 80432 ± 39 MeV and [Lambda]{sub W} = 2056 ± 62 MeV. The inclusion of a preliminary Run-II measurement of [Lambda]{sub W} from D−0 gives [Lambda]{sub W} = 2050 ± 58 MeV.
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ISBN 13 :
Total Pages : 11 pages
Book Rating : 4.:/5 (965 download)
Download or read book 2012 Update of the Combination of CDF and D0 Results for the Mass of the W Boson written by and published by . This book was released on 2012 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: We summarize and combine the results on the direct measurements of the mass of the W boson in data collected by the Tevatron experiments CDF and D0 at Fermilab. Earlier results from CDF Run-0 (1988-1989), D0 and CDF Run-I (1992-1995) and D0 results from 1 fb−1 (2002-2006) of Run-II data are now combined with two new, high statistics Run-II measurements: a CDF measurement in both electron and muon channels using 2.2 fb−1 of integrated luminosity collected between 2002 and 2007, and a D0 measurement in the electron channel using 4.3 fb−1 collected between 2006 and 2009. As in previous combinations, the results are corrected for inconsistencies in parton distribution functions and assumptions about electroweak parameters used in the different analyses. The resulting Tevatron average for the mass of the W boson is M{sub W} = 80,387 ± 16 MeV and a new world average including data from LEP II is M{sub W} = 80,385 ± 15 MeV.
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ISBN 13 :
Total Pages : 26 pages
Book Rating : 4.:/5 (16 download)
Download or read book Combination of CDF and D0 Results on $W$ Boson Mass and Width written by and published by . This book was released on 2003 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Combination of CDF and D0 Measurements of the $W$ Boson Helicity in Top Quark Decays written by and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Combination of CDF and D0 Results on the Width of the W Boson written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We summarize and combine direct measurements of the width of the W boson in data collected by the Tevatron experiments CDF and D0 at Fermilab. Results from CDF and D0 Run-I (1992-1995) have been combined with the CDF 200 pb−1 results from the first period of Run-II (2001-2004) and the recent 1 fb−1 result in the electron channel from D0 (2002-2006). The results are corrected for any inconsistencies in parton distribution functions and assumptions about electroweak parameters used in the different analyses. The resulting Tevatron average for the width of the W boson is [Lambda]{sub W} = 2,046 ± 49 MeV.
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ISBN 13 :
Total Pages : 7 pages
Book Rating : 4.:/5 (316 download)
Download or read book Combination of CDF and D0 Results on the W-Boson Width written by and published by . This book was released on 2005 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The results on the direct measurements of the W-boson width, based on the data collected by the Tevatron experiments CDF and D0 at Fermilab during Run-I from 1992 to 1996 and Run-II since 2001 are summarized. The combination of the published Run-I and preliminary Run-II results, taking correlated uncertainties properly into account, is presented. The resulting preliminary Tevatron average for the total decay width of the W boson is: {Lambda}{sub W} = 2078 {+-} 87 MeV, where the total error consists of a statistical part of 62 MeV and a systematic part of 60 MeV.
Download or read book Direct and Indirect Measurements of the W Boson Mass at Fermilab written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Presented are the direct measurements of the W boson mass from the CDF and D0 experiments at the Fermilab p[bar p] collider using data from the 1994--1995 run. The W from the D0 experiment is 80.44[+-] 0.12 GeV and the preliminary mass from CDF is 80.43[+-] 0.16 GeV. Combining these mass values with the previous Tevatron measurements leads to a M[sub W] 80.41[+-] 0.09 GeV. Also, presented is the new measurement of sin[sup 2][Theta][sub W][sup on-shell]= 0.2199[+-] 0.0020(stat)[+-] 0.0009(syst) from the deep inelastic neutrino scattering experiment (NuTeV) at Fermilab. In the context of the Standard Model this can be interpreted as a M[sub W]= 80.53[+-] 0.11 GeV.
Download or read book Updated Combination of CDF and D0 Results for the Mass of the W Boson written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (986 download)
Download or read book W Boson Mass Measurement at CDF. written by and published by . This book was released on 2017 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the closeout report for the grant for experimental research at the energy frontier in high energy physics. The report describes the precise measurement of the W boson mass at the CDF experiment at Fermilab, with an uncertainty of ≈ 12 MeV, using the full dataset of ≈ 9 fb-1 collected by the experiment up to the shutdown of the Tevatron in 2011. In this analysis, the statistical and most of the experimental systematic uncertainties have been reduced by a factor of two compared to the previous measurement with 2.2 fb-1 of CDF data. This research has been the culmination of the PI's track record of producing world-leading measurements of the W boson mass from the Tevatron. The PI performed the first and only measurement to date of the W boson mass using high-rapidity leptons using the D0 endcap calorimeters in Run 1. He has led this measurement in Run 2 at CDF, publishing two world-leading measurements in 2007 and 2012 with total uncertainties of 48 MeV and 19 MeV respectively. The analysis of the final dataset is currently under internal review in CDF. Upon approval of the internal review, the result will be available for public release.
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ISBN 13 :
Total Pages : 4 pages
Book Rating : 4.:/5 (873 download)
Download or read book W Mass Measurements from D{circle_slash} and CDF Experiments at TeVatron written by and published by . This book was released on 1994 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present preliminary measurements of the W boson mass made by the D0 and CDF experiments using data collected at the Fermilab TeVatron {bar p}p collider operating at √s = 1.8 TeV. The result from the CDF W → e[nu] data analysis is M{sub W} = 80.47 ± 0.15(stat) ± 0.25(sys) GeV/c2 and the result from the CDF W → [mu][nu] data analysis is M{sub W} = 80.29 ± 0.20(stat) ± 0.24(sys) GeV/c2. The result from the D0 W → e[nu] data analysis is M{sub W} = 79.86 ± 0.16(stat) ± 0.31(sys) GeV/c2. When combined with the previous measurements, these results yield a world average value of M{sub W}, 80.23 ± 0.18 GeV/c2.
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ISBN 13 :
Total Pages : 4 pages
Book Rating : 4.:/5 (16 download)
Download or read book Precise Measurement of the $W$-boson Mass with the CDF II Detector written by and published by . This book was released on 2012 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: We have measured the W-boson mass M{sub W} using data corresponding to 2.2 fb−1 of integrated luminosity collected in p{bar p} collisions at √s = 1.96 TeV with the CDF II detector at the Fermilab Tevatron collider. Samples consisting of 470 126 W → e? candidates and 624 708 W →?? candidates yield the measurement M{sub W} = 80 387 ± 12{sub stat} ± 15{sub syst} = 80 387 ± 19 MeV/c2. This is the most precise measurement of the W-boson mass to date and significantly exceeds the precision of all previous measurements combined.
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ISBN 13 :
Total Pages : 8 pages
Book Rating : 4.:/5 (16 download)
Download or read book Precise Measurements of the $W$ Mass at the Tevatron and Indirect Constraints on the Higgs Mass written by and published by . This book was released on 2012 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: I describe the latest D0 and CDF W boson mass measurements. The D0 measurement is performed with 4.3 fb−1 of integrated luminosity in the electron decay channel with a data set of 1.68 x 108 W candidates. The value of the W boson mass measured by D0 is M{sub W} = 80.375 ± 0.023 GeV when combined with the previously analyzed 1 fb−1 of integrated luminosity. The CDF measurement uses 2.2 fb−1 of integrated luminosity in both electron and muon decay channels with a total of 1.1 x 108 W candidates. The value of the W boson mass measured by CDF is M{sub W} = 80.387 ± 0.019 GeV. I report the combination of these two measurements with previous Tevatron measurements and with the LEP measurements of the W boson mass. The new world average is M{sub W} = 80.385 ± 0.015GeV. I discuss the implications of the new measurement to the indirect measurement of the Standard Model Higgs boson mass.
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ISBN 13 :
Total Pages : 254 pages
Book Rating : 4.:/5 (953 download)
Download or read book Measurements of the $W$ Boson Mass with the D0 Detector written by and published by . This book was released on 2013 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the first part, we describe what is the W boson mass in the context of the Standard Model. We discuss the prominent role this physical observable plays in the determination of the internal self consistency of the Electroweak Sector. We review measurements and calculation of the W boson mass done in past and argue about the importance and feasibility of improving the experimental determination. We give a description of the Fermilab Tevatron Collider and the D0 detector, highlighting the relevant parts for the measurement described in this Dissertation. In the second part, we give a detailed description of a measurement of the W boson mass using the D0 Central Calorimeter. The measurement uses 1.68 x 106 candidates from W → en decays, corresponding to 4.3 fb-1 of integrated luminosity collected from 2006 to 2009. We measure the mass using the transverse mass, electron transverse momentum, and missing transverse energy distributions. The transverse mass and electron transverse momentum measurements are the most precise and are combined to give MW = 80.367 ± 0.013(stat) ± 0.023 (syst) GeV = 80.367 ± 0.026 GeV. This is combined with an earlier D0 result determined using an independent 1 fb-1 data sample, also with central electrons only, to give MW = 80.375± 0.023 GeV. The uncertainty in the measurement is dominated by the determination of the calorimeter electron energy scale, the W sample size, the knowledge of the parton distribution function. In the third part, we discuss methods of reducing the dominant uncertainties in the W boson mass measurements. We show that introducing electrons detected in the End Calorimeters greatly reduce the measurement systematic uncertainty, especially the on related to the parton distribution functions. We describe a precise calibration of the End Calorimeter using Z → ee events corresponding to 4.3 fb-1 of integrated luminosity. The calibration is an important milestone in a measurement that explores a larger part of the D0 Calorimeter. We present parametrized models that describe the response of the End Calorimeters to electron showers and soft hadronic particles, giving special attention to the specific challenges of a measurement in the forward region: the inhomogeneity of the uninstrumented materials, the large hadronic energy flow in the calorimeter and the jet misidentification probability.
Download or read book Australian Book-plates written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of the $W$ Boson Mass with the D0 Detector written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We give a detailed description of the measurement of the $W$ boson mass, $M_W$, performed on an integrated luminosity of 4.3 fb$^{-1}$, which is based on similar techniques as used for our previous measurement done on an independent data set of 1 fb$^{-1}$ of data. The data were collected using the D0 detector at the Fermilab Tevatron Collider. This data set yields $1.68\times 10^6$ $W\rightarrow e\nu$ candidate events. We measure the mass using the transverse mass, electron transverse momentum, and missing transverse energy distributions. The $M_W$ measurements using the transverse mass and the electron transverse momentum distributions are the most precise of these three and are combined to give $M_W$ = 80.367 $\pm$ 0.013 (stat) $\pm$ 0.022 (syst) GeV = 80.367 $\pm$ 0.026 GeV. When combined with our earlier measurement on 1 fb$^{-1}$ of data, we obtain $M_W$ = 80.375 $\pm$ 0.023 GeV.
Download or read book The Measurement of the W Boson Mass from CDF. written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent results from LEP experiments have substantially improved the knowledge of the Z boson. However, hadron colliders remain the only source of direct measurements of the W boson. There have been measurements of the W boson mass from the UA2 and CDF collaborations. The W mass continues to be a subject of great interest in testing the Standard Model. Here, the authors have made a preliminary determination of the W boson mass M[sub W] = 80.38 [+-] 0.23 GeV/c[sup 2] from a combined analysis of W [yields] e[nu] and W [yields] [mu][nu] in [anti p]p collisions at [radical]s = 1.8 TeV. The electron data alone yields M[sub W] = 80.47 [+-] 0.15(stat.) [+-] 0.25(syst.) GeV/c[sup 2], while the muon data gives M[sub W] = 80.29 [+-] 0.20(stat.) [+-] 0.24(syst.) GeV/c[sup 2].
