The direct limit on the Higgs Mass and the SM Fit

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Because of two 3{sigma} anomalies, the Standard Model (SM) fit of the precision electroweak data has a poor confidence level, CL = 0.02. Since both anomalies involve challenging systematic issues, it might appear that the SM could still be valid if the anomalies resulted from underestimated systematic error. Indeed the CL of the global fit could then increase to 0.71, but that fit predicts a small Higgs boson mass, m{sub H} = 45 GeV, that is inconsistent at 95% CL with the lower limit, m{sub H} > 114 GeV, established by direct searches. The data then favor new physics whether ... continued below

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12 pages

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Chanowitz, Michael S. April 21, 2003.

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Description

Because of two 3{sigma} anomalies, the Standard Model (SM) fit of the precision electroweak data has a poor confidence level, CL = 0.02. Since both anomalies involve challenging systematic issues, it might appear that the SM could still be valid if the anomalies resulted from underestimated systematic error. Indeed the CL of the global fit could then increase to 0.71, but that fit predicts a small Higgs boson mass, m{sub H} = 45 GeV, that is inconsistent at 95% CL with the lower limit, m{sub H} > 114 GeV, established by direct searches. The data then favor new physics whether the anomalous measurements are excluded from the fit or not, and the Higgs boson mass cannot be predicted until the new physics is understood. Some measure of statistical fluctuation would be needed to maintain the validity of the SM. New physics is favored, but the SM is not definitively excluded.

Physical Description

12 pages

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INIS; OSTI as DE00812449

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  • Electroweak Precision Data and the Higgs Mass, Zeuthen (DE), 02/28/2003--03/01/2003

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  • Report No.: LBNL--52452
  • Report No.: ARXIV:HEP-PH/0304199 V1
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 812449
  • Archival Resource Key: ark:/67531/metadc737157

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • April 21, 2003

Added to The UNT Digital Library

  • Oct. 18, 2015, 6:40 p.m.

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  • April 4, 2016, 5:51 p.m.

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Chanowitz, Michael S. The direct limit on the Higgs Mass and the SM Fit, article, April 21, 2003; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc737157/: accessed December 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.