The ${{\mathit W}}$ width listed here corresponds to the width parameter in a Breit-Wigner distribution with mass-dependent width. To obtain the world average, common systematic uncertainties between experiments are properly taken into account. The LEP-2 average ${{\mathit W}}$ width based on published results is $2.195$ $\pm0.083$ GeV [SCHAEL 2013A]. The combined Tevatron data yields an average W width of $2.046$ $\pm0.049$ GeV [FERMILAB-TM-2460-E].

OUR FIT uses these average LEP and Tevatron width values and combines them assuming no correlations.

VALUE (GeV) EVTS DOCUMENT ID TECN  COMMENT $\bf{ 2.085 \pm0.042}$ OUR FIT $2.028$ $\pm0.072$ 5272 1 ABAZOV 2009 AK D0 ${\it{}E}^{\it{}p\overline{\it{}p}}_{\rm{}cm}$ = 1.96 GeV $2.032$ $\pm0.045$ $\pm0.057$ 6055 2 AALTONEN 2008 B CDF ${\it{}E}^{\it{}p\overline{\it{}p}}_{\rm{}cm}$ = 1.96 TeV $2.404$ $\pm0.140$ $\pm0.101$ 10.3k 3 ABDALLAH 2008 A DLPH ${\it{}E}^{\it{}ee}_{\rm{}cm}$= $183 - 209$ GeV $1.996$ $\pm0.096$ $\pm0.102$ 10729 4 ABBIENDI 2006 OPAL ${\it{}E}^{\it{}ee}_{\rm{}cm}$= $170 - 209$ GeV $2.18$ $\pm0.11$ $\pm0.09$ 9795 5 ACHARD 2006 L3 ${\it{}E}^{\it{}ee}_{\rm{}cm}$= $172 - 209$ GeV $2.14$ $\pm0.09$ $\pm0.06$ 8717 6 SCHAEL 2006 ALEP ${\it{}E}^{\it{}ee}_{\rm{}cm}$= $183 - 209$ GeV $2.23$ ${}^{+0.15}_{-0.14}$ $\pm0.10$ 294 7 ABAZOV 2002 E D0 ${\it{}E}^{\it{}p\overline{\it{}p}}_{\rm{}cm}$ = 1.8 TeV $2.05$ $\pm0.10$ $\pm0.08$ 662 8 AFFOLDER 2000 M CDF ${\it{}E}^{\it{}p\overline{\it{}p}}_{\rm{}cm}$ = 1.8 TeV • • We do not use the following data for averages, fits, limits, etc. • • $2.152$ $\pm0.066$ 79176 9 ABBOTT 2000 B D0 Extracted value $2.064$ $\pm0.060$ $\pm0.059$ 10 ABE 1995 W CDF Extracted value $2.10$ ${}^{+0.14}_{-0.13}$ $\pm0.09$ 3559 11 ALITTI 1992 UA2 Extracted value $2.18$ ${}^{+0.26}_{-0.24}$ $\pm0.04$ 12 ALBAJAR 1991 UA1 Extracted value 1  ABAZOV 2009AK obtain this result fitting the high-end tail (100-200 GeV) of the transverse mass spectrum in ${{\mathit W}}$ $\rightarrow$ ${{\mathit e}}{{\mathit \nu}}$ decays. 2  AALTONEN 2008B obtain this result fitting the high-end tail ($90 - 200$ GeV) of the transverse mass spectrum in semileptonic ${{\mathit W}}$ $\rightarrow$ ${{\mathit e}}{{\mathit \nu}_{{{e}}}}$ and ${{\mathit W}}$ $\rightarrow$ ${{\mathit \mu}}{{\mathit \nu}_{{{\mu}}}}$ decays. 3  ABDALLAH 2008A use direct reconstruction of the kinematics of ${{\mathit W}^{+}}$ ${{\mathit W}^{-}}$ $\rightarrow$ ${{\mathit q}}{{\overline{\mathit q}}}{{\mathit \ell}}{{\mathit \nu}}$ and ${{\mathit W}^{+}}$ ${{\mathit W}^{-}}$ $\rightarrow$ ${{\mathit q}}{{\overline{\mathit q}}}{{\mathit q}}{{\overline{\mathit q}}}$ events. The systematic error includes $\pm0.065$ GeV due to final state interactions. 4  ABBIENDI 2006 use direct reconstruction of the kinematics of ${{\mathit W}^{+}}$ ${{\mathit W}^{-}}$ $\rightarrow$ ${{\mathit q}}{{\overline{\mathit q}}}{{\mathit \ell}}{{\mathit \nu}_{{{{{\mathit \ell}}}}}}$ and ${{\mathit W}^{+}}$ ${{\mathit W}^{-}}$ $\rightarrow$ ${{\mathit q}}{{\overline{\mathit q}}}{{\mathit q}}{{\overline{\mathit q}}}$ events. The systematic error includes $\pm0.003$ GeV due to the uncertainty on the LEP beam energy. 5  ACHARD 2006 use direct reconstruction of the kinematics of ${{\mathit W}^{+}}$ ${{\mathit W}^{-}}$ $\rightarrow$ ${{\mathit q}}{{\overline{\mathit q}}}{{\mathit \ell}}{{\mathit \nu}_{{{{{\mathit \ell}}}}}}$ and ${{\mathit W}^{+}}$ ${{\mathit W}^{-}}$ $\rightarrow$ ${{\mathit q}}{{\overline{\mathit q}}}{{\mathit q}}{{\overline{\mathit q}}}$ events in the C.M. energy range $189 - 209$ GeV. The result quoted here is obtained combining this value of the width with the result obtained from a direct ${{\mathit W}}$ mass reconstruction at 172 and 183 GeV (ACCIARRI 1999 ). 6  SCHAEL 2006 use direct reconstruction of the kinematics of ${{\mathit W}^{+}}$ ${{\mathit W}^{-}}$ $\rightarrow$ ${{\mathit q}}{{\overline{\mathit q}}}{{\mathit \ell}}{{\mathit \nu}_{{{{{\mathit \ell}}}}}}$ and ${{\mathit W}^{+}}$ ${{\mathit W}^{-}}$ $\rightarrow$ ${{\mathit q}}{{\overline{\mathit q}}}{{\mathit q}}{{\overline{\mathit q}}}$ events. The systematic error includes $\pm0.05$ GeV due to possible effects of final state interactions in the ${{\mathit q}}{{\overline{\mathit q}}}{{\mathit q}}{{\overline{\mathit q}}}$ channel and $\pm0.01$ GeV due to the uncertainty on the LEP beam energy. 7  ABAZOV 2002E obtain this result fitting the high-end tail ($90 - 200$ GeV) of the transverse-mass spectrum in semileptonic ${{\mathit W}}$ $\rightarrow$ ${{\mathit e}}{{\mathit \nu}_{{{e}}}}$ decays. 8  AFFOLDER 2000M fit the high transverse mass ($100 - 200~$GeV) ${{\mathit W}}$ $\rightarrow$ ${{\mathit e}}{{\mathit \nu}_{{{e}}}}$ and ${{\mathit W}}$ $\rightarrow$ ${{\mathit \mu}}{{\mathit \nu}_{{{\mu}}}}$ events to obtain $\Gamma\mathrm {({{\mathit W}})}$= $2.04$ $\pm0.11$(stat)$\pm0.09$(syst) GeV. This is combined with the earlier CDF measurement (ABE 1995C) to obtain the quoted result. 9  ABBOTT 2000B measure $\mathit R$ = $10.43$ $\pm0.27$ for the ${{\mathit W}}$ $\rightarrow$ ${{\mathit e}}{{\mathit \nu}_{{{e}}}}$ decay channel. They use the SM theoretical predictions for $\sigma\mathrm {({{\mathit W}})}/\sigma\mathrm {({{\mathit Z}})}$ and $\Gamma\mathrm {( {{\mathit W}} \rightarrow {{\mathit e}} {{\mathit \nu}_{{{e}}}} )}$ and the world average for B( ${{\mathit Z}}$ $\rightarrow$ ${{\mathit e}}{{\mathit e}}$ ). The value quoted here is obtained combining this result ($2.169$ $\pm0.070$ GeV) with that of ABBOTT 1999H. 10  ABE 1995W measured $\mathit R$ = $10.90$ $\pm0.32$ $\pm0.29$. They use ${\mathit m}_{{{\mathit W}}}=80.23$ $\pm0.18$ GeV, ${\mathit \sigma (}{{\mathit W}}{)}/{\mathit \sigma (}{{\mathit Z}}{)}$ = $3.35$ $\pm0.03$, $\Gamma\mathrm {( {{\mathit W}} \rightarrow {{\mathit e}} {{\mathit \nu}} )}$ = $225.9$ $\pm0.9$ MeV, $\Gamma\mathrm {( {{\mathit Z}} \rightarrow {{\mathit e}^{+}} {{\mathit e}^{-}} )}$ = $83.98$ $\pm0.18$ MeV, and $\Gamma\mathrm {({{\mathit Z}})}$ = $2.4969$ $\pm0.0038$ GeV. 11  ALITTI 1992 measured $\mathit R$ = $10.4$ ${}^{+0.7}_{-0.6}$ $\pm0.3$. The values of ${\mathit \sigma (}{{\mathit Z}}{)}$ and ${\mathit \sigma (}{{\mathit W}}{)}$ come from $\mathit O(\alpha {}^{2}_{\mathit s}$) calculations using ${\mathit m}_{{{\mathit W}}}$ = $80.14$ $\pm0.27$ GeV, and ${\mathit m}_{{{\mathit Z}}}$ = $91.175$ $\pm0.021$ GeV along with the corresponding value of sin$^2\theta _{{{\mathit W}}}$ = $0.2274$. They use ${\mathit \sigma (}{{\mathit W}}{)}/{\mathit \sigma (}{{\mathit Z}}{)}$ = $3.26$ $\pm0.07$ $\pm0.05$ and $\Gamma\mathrm {({{\mathit Z}})}$ = $2.487$ $\pm0.010$ GeV. 12  ALBAJAR 1991 measured $\mathit R$ = $9.5$ ${}^{+1.1}_{-1.0}$ (stat. + syst.). ${\mathit \sigma (}{{\mathit W}}{)}/{\mathit \sigma (}{{\mathit Z}}{)}$ is calculated in QCD at the parton level using ${\mathit m}_{{{\mathit W}}}$ = $80.18$ $\pm0.28$ GeV and ${\mathit m}_{{{\mathit Z}}}$ = $91.172$ $\pm0.031$ GeV along with sin$^2\theta _{\mathit W}$ = $0.2322$ $\pm0.0014$. They use ${\mathit \sigma (}{{\mathit W}}{)}/{\mathit \sigma (}{{\mathit Z}}{)}$ = $3.23$ $\pm0.05$ and $\Gamma\mathrm {({{\mathit Z}})}$ = $2.498$ $\pm0.020$ GeV. This measurement is obtained combining both the electron and muon channels.

References:

ABAZOV 2009AK PRL 103 231802 Direct Measurement of the $\mathit W$ Boson Width AALTONEN 2008B PRL 100 071801 Direct Measurement of the ${{\mathit W}}$ Boson Width in ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions at $\sqrt {s }$ = 1.96 TeV ABDALLAH 2008A EPJ C55 1 Measurement of the Mass and Width of the ${{\mathit W}}$ Boson in ${{\mathit e}^{+}}{{\mathit e}^{-}}$ Collisions at $\sqrt {s }$ = $161 - 209$ GeV ABBIENDI 2006 EPJ C45 307 Measurement of the Mass and Width of the ${{\mathit W}}$ Boson ACHARD 2006 EPJ C45 569 Measurement of the Mass and the Width of the ${{\mathit W}}$ Boson at LEP SCHAEL 2006 EPJ C47 309 Measurement of the ${{\mathit W}}$ Boson Mass and Width in ${{\mathit e}^{+}}{{\mathit e}^{-}}$ Collisions at LEP ABAZOV 2002E PR D66 032008 A Direct Measurement of ${{\mathit W}}$ Boson Decay Width ABBOTT 2000B PR D61 072001 Extraction of the Width of the ${{\mathit W}}$ Boson from Measurements of ${\mathit \sigma (}$ ${{\mathit p}}$ ${{\overline{\mathit p}}}$ $\rightarrow$ ${{\mathit W}}{+}$ ${{\mathit X}}{)}{\times }$ B( ${{\mathit W}}$ $\rightarrow$ ${{\mathit e}}{{\mathit \nu}}$ ) and ${\mathit \sigma (}$ ${{\mathit p}}$ ${{\overline{\mathit p}}}$ $\rightarrow$ ${{\mathit Z}}{+}$ ${{\mathit X}}{)}{\times }$ B( ${{\mathit Z}}$ $\rightarrow$ ${{\mathit e}}{{\mathit e}}$ ) and their Ratio AFFOLDER 2000M PRL 85 3347 Direct Measurement of the ${{\mathit W}}$ Boson Width in ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions at $\sqrt {s }$ = 1.8 TeV ABE 1995W PR D52 2624 A Measurement of the Ratio $\sigma $B( ${{\mathit p}}$ ${{\overline{\mathit p}}}$ $\rightarrow$ ${{\mathit W}}$ $\rightarrow$ ${{\mathit e}}{{\mathit \nu}}$ )/$\sigma $B( ${{\mathit p}}$ ${{\overline{\mathit p}}}$ $\rightarrow$ ${{\mathit Z}^{0}}$ $\rightarrow$ ${{\mathit e}}{{\mathit e}}$ ) in ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions at $\sqrt {s }$ = 1800 GeV Also PRL 73 220 Measurement of the Ratio $\sigma $B( ${{\mathit W}}$ $\rightarrow$ ${{\mathit e}}{{\mathit \nu}}$ )/$\sigma $B( ${{\mathit Z}^{0}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$ ) in ${{\overline{\mathit p}}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 1.8 TeV ALITTI 1992 PL B276 365 A Measurement of the ${{\mathit W}}$ and ${{\mathit Z}}$ Production Cross Sections and a Determination of $\Gamma ({{\mathit W}}$) at the CERN ${{\overline{\mathit p}}}{{\mathit p}}$ Collider ALBAJAR 1991 PL B253 503 Measurement of the Ratio $\mathit R$ = $\sigma{}_{W}\cdot{}$B( ${{\mathit W}}$ $\rightarrow$ ${{\mathit \mu}}{{\mathit \nu}}$ )/$\sigma{}_{Z}$ $\cdot{}$B( ${{\mathit Z}}$ $\rightarrow$ ${{\mathit \mu}^{-}}{{\mathit \mu}^{+}}$ ) and $\Gamma {}^{tot}_{{{\mathit W}}}$ at the CERN Proton Antiproton Collider