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Title: W Boson Mass Measurement at CDF

Abstract

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 publicmore » release.« less

Authors:
 [1]
  1. Duke Univ., Durham, NC (United States). Physics Dept.
Publication Date:
Research Org.:
Duke Univ., Durham, NC (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1348184
Report Number(s):
DOE-DUKE-10009
DOE Contract Number:
SC0010009
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Kotwal, Ashutosh V. W Boson Mass Measurement at CDF. United States: N. p., 2017. Web. doi:10.2172/1348184.
Kotwal, Ashutosh V. W Boson Mass Measurement at CDF. United States. doi:10.2172/1348184.
Kotwal, Ashutosh V. Mon . "W Boson Mass Measurement at CDF". United States. doi:10.2172/1348184. https://www.osti.gov/servlets/purl/1348184.
@article{osti_1348184,
title = {W Boson Mass Measurement at CDF},
author = {Kotwal, Ashutosh V.},
abstractNote = {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.},
doi = {10.2172/1348184},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Mar 27 00:00:00 EDT 2017},
month = {Mon Mar 27 00:00:00 EDT 2017}
}

Technical Report:

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  • 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 = 1.8more » 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}.« less
  • We present results from W and Z boson production in proton-antiproton collisions at {radical}s = 1.8 TeV using the CDF detector. We measure the W and Z cross sections times lepton branching ratio, {sigma}(p{bar p} {yields} W){center_dot}B(W {yields} l{nu}{sub l}) and {sigma}(p {bar p} {yields} Z){center_dot} B(Z {yields} k{sup +}l{sup {minus}}) l = e, {mu}. We also measure the ratio: R{sub l} = {sigma} {center_dot} B(W {yields} l{nu}{sub l})/{sigma} {center_dot} B(Z {yields} ll). From R{sub l}, we extract the W electron and muon branching ratios, BR(W {yields} l{nu}{sub l}, and the total W width, {Gamma}{sub W}. In addition, high transversemore » mass W {yields}e{nu}{sub e}, candidates provide an alternate, direct measurement of {Gamma}{sub W}.« less
  • 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{sup -} 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{sup -} 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{submore » 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{sup -}0 gives {Lambda}{sub W} = 2050 {+-} 58 MeV.« less
  • 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{sup -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{sup -1} of integrated luminosity collected between 2002 and 2007, and a D0 measurement in the electron channel using 4.3 fb{sup -1} collected between 2006 and 2009. Asmore » 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.« less