Convener: Ashutosh Kotwal

Amoung the electroweak measureables at the Tevatron, the determination of the mass of the W boson is of critical importance. Hand in hand with the determination of the mass of the top quark , and in conjunction with the precisely known mass of the Z boson , the electroweak sector of the Standard Model is confronted. Direct measurements by DØ of the masses of the W boson and the top quark place constraints on the Higgs mass .

This page contains information on the various DØ measurements of the W mass. You can find plots, publications, conference proceedings and copies of talks.

Summary of Results:

New: Improved measurement of the W mass using events in which the electron shower is close to the phi edge of one of the 32 modules in the central calorimeter. When combined with our previously published results (see below) we obtain:

For details see our paper submitted to the International Europhysics Conference on High Energy Physics, July 12-18, 2001,
hep-ex/0106018 . Also see a description here .

The published DØ measurement of the W boson mass, from a combined fit to the transverse mass and lepton transverse momentum spectra, and using Run 1A+1B central calorimeter data and the Run1B end calorimeter data, is
 

The new end calorimeter measurement is described here, and is published in:

• A measurement of the W boson mass using electrons at large rapidities

Phys. Rev. Lett. {84}, 222 (2000) PDF (Copyright by the APS)
FERMILAB PUB-99/259-E, hep-ex/9909030. PS

• A measurement of the W boson mass using large rapidity electrons

Submitted to Phys. Rev. D {xx} pppp 1999
FERMILAB PUB-99/237-E, hep-ex/9908057. PS

 The previous measurement performed using the central calorimeter only is described in the following papers:

• A Measurement of the W Boson Mass at the Fermilab pbarp Collider.

Phys. Rev. Letters {80} 3008 (1998) PDF (Copyright by the APS)
FERMILAB PUB-97/423-E, hep-ex/9712028. PS

• Determination of the Mass of the W Boson Using the D0 Detector at the Tevatron.

Phys. Rev. D {58} 12002 (1998) PDF (Copyright by the APS)
FERMILAB PUB-97/328-E, hep-ex/9710007. PS

The current world average of the direct measurements of the W mass is:

If one includes the indirect determination from NuTeV (80.250 +- 0.110 GeV) the world average
becomes 80.376 +- 0.039 GeV.

W mass summary plots
 

The points show direct measurements of the W boson mass by UA2, CDF, DØ and LEP2.

Plot of M(W) vs. M(top).

Other W Mass Related Links: CDF , LEP2

Collection of DØ W Mass Publications:

• Measurement of the W Boson Mass, PRL 77, 3309 (1996).
• Determination of the Mass of the W boson Using the DÆ detector at the Tevatron , B.Abbott et.al., Phys. Rev. D 58, 12002 (1998)

Collection of relevant conference proceedings:

• W Boson Physics at the Tevatron , ICHEP 1998, Ashutosh Kotwal, (Postscript)
• Review of W Results from DØ , EPS 1997, Ashutosh Kotwal, (Postscript)
• DØ Results on W Boson Properties, Lepton-Photon, 1997, (Postscript)
• Precision Electroweak Measurements, DPF, 1996, Marcel Demarteau, FERMILAB-Conf-96/354. (Postscript)
• DØ Papers on Electroweak Physics Submitted to DPF '96 , DPF, 1996, M.L. Kelly et al., For the DØ Collaboration, FERMILAB-Conf-96/236-E. (Postscript) or (PDF)
• Detector Implications for Electroweak Physics at the Tevatron , Advanced Technology and Particle Physics, 1996, R. Madaras, For the DØ and CDF Collaborations. (Postscript)
• W Mass from the Tevatron, ICHEP, 1996, M. Rijssenbeek, For the DØ and CDF Collaborations, FERMILAB-Conf-96/365-E. (Postscript)
• Electroweak Results from the Tevatron, Snowmass, 1996, Marcel Demarteau, Fermilab-Conf-96/353. (Postscript)
• Measurement of MW Using the Transverse Mass Ratio of W and Z , Snowmass, 1996, S. Rajagopalan and M. Rijssenbeek, For the DØ Collaboration. (Postscript)
• W Properties and Boson Couplings, Physics in Collision, 1996, S. Rajagopalan, For the DØ and CDF Collaborations. (Postscript)
• A Preliminary Measurement of the W Boson Mass Using W - e nu Decays at DØ, pbarp, 1996, E.M. Flattum, For the DØ Collaboration, FERMILAB-Conf-96/199-E. (Postscript) or (PDF)
• Electroweak Measurements from the Tevatron, LaThuile, 1996, U. Heintz, For the DØ and CDF Collaborations (FERMILAB-Conf-96/143-E). (Postscript) or (PDF)
• Electroweak Results from DØ, Moriond, 1996, K. Streets, For the DØ Collaboration, FERMILAB-Conf-96/149-E. (Postscript) or (PDF)

Collection of relevant talks:

• W Boson Mass Measurement at DØ using Forward Detectors , Ashutosh Kotwal , Fermilab Wine and Cheese Seminar, February, 1999.

• Measurement of the W Boson Mass at DØ , Eric Flattum , University of Chicago HEP Seminar, December, 1998.

• W Boson Physics at the Tevatron , Ashutosh Kotwal , ICHEP Vancouver, July, 1998.

• Review of W results from DØ , Ashutosh Kotwal , International Europhysics Conference, Jerusalem, August, 1997.

• DØ Results on W Boson Properties , Kathy Streets , Hadron Collider Physics, 1997. (1.1Mb)
• W Mass Measurement from DØ , Ulrich Heintz , Fermilab Wine and Cheese, Batavia, March, 1997 (2.0Mb).
• Recent Results from DØ , Kathleen Streets , Recent Developments in Phenomenology, Madison, 1997 (1.7Mb).

(click here for figures)
• Electroweak Physics from DØ , Darien Wood , Moriond, 1997. (1.4Mb)
• Precision Electroweak Measurements , Marcel Demarteau , DPF, Minneapolis, 1996. (3.0Mb)
• W Properties and Boson Couplings (from CDF and D0) , S. Rajagopalan , Physics in Collision, Mexico City, 1996. (2.3Mb)
• Electroweak Physics Results from the Tevatron , Marcel Demarteau , Snowmass, 1996. (3.6Mb)
• Preliminary W Mass Results from DØ , Eric Flattum , pbarp, Padova, 1996. (1.2Mb)

Collection of Publically Available DØ Internal Documents

• Run 1a Analysis Notes

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This page maintained by John Ellison
Last modified: Oct 7, 2001