skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Prospects for a low-mass Higgs boson

Abstract

The SU(2){sub L} x U(1){sub Y} gauge theory of the electroweak interactions has enjoyed tremendous success over the past four decades, accurately predicting, or at least accommodating, all high-energy collider data. The gauge group must be broken somehow to U(1){sub EM}, because the unbroken theory predicts massless gauge bosons and massless fermions. The Standard Model incorporates a minimal Higgs sector with a single complex doublet field, to break the symmetry spontaneously, but it is not the only possibility. SUSY Higgses, general two-Higgs-doublet models, and other ideas may prove to model nature better than the minimal model. Many of these models, and even the SM, prefer a light Higgs boson, with a mass between the LEP limit of 114.4 GeV and 200 GeV. The Constrained MSSM favors masses under 120 GeV. A survey of the experimental work so far at LEP and the Tevatron, with estimations of the sensitivity of the upcoming LHC experiments is provided.

Authors:
;
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
922302
Report Number(s):
FERMILAB-CONF-07-636-E
TRN: US0801126
DOE Contract Number:
AC02-07CH11359
Resource Type:
Conference
Resource Relation:
Journal Name: AIP Conf.Proc.928:178-185,2007; Conference: Prepared for 2nd International Colliders to Cosmic Rays Conference (C2CRO7), Lake Tahoe, California, 25 Feb - 1 Mar 2007
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; BOSONS; FERMILAB TEVATRON; FERMIONS; HIGGS BOSONS; SENSITIVITY; STANDARD MODEL; SYMMETRY; Phenomenology-HEP

Citation Formats

Junk, Thomas R., and /Illinois U., Urbana. Prospects for a low-mass Higgs boson. United States: N. p., 2007. Web. doi:10.1063/1.2775912.
Junk, Thomas R., & /Illinois U., Urbana. Prospects for a low-mass Higgs boson. United States. doi:10.1063/1.2775912.
Junk, Thomas R., and /Illinois U., Urbana. Mon . "Prospects for a low-mass Higgs boson". United States. doi:10.1063/1.2775912. https://www.osti.gov/servlets/purl/922302.
@article{osti_922302,
title = {Prospects for a low-mass Higgs boson},
author = {Junk, Thomas R. and /Illinois U., Urbana},
abstractNote = {The SU(2){sub L} x U(1){sub Y} gauge theory of the electroweak interactions has enjoyed tremendous success over the past four decades, accurately predicting, or at least accommodating, all high-energy collider data. The gauge group must be broken somehow to U(1){sub EM}, because the unbroken theory predicts massless gauge bosons and massless fermions. The Standard Model incorporates a minimal Higgs sector with a single complex doublet field, to break the symmetry spontaneously, but it is not the only possibility. SUSY Higgses, general two-Higgs-doublet models, and other ideas may prove to model nature better than the minimal model. Many of these models, and even the SM, prefer a light Higgs boson, with a mass between the LEP limit of 114.4 GeV and 200 GeV. The Constrained MSSM favors masses under 120 GeV. A survey of the experimental work so far at LEP and the Tevatron, with estimations of the sensitivity of the upcoming LHC experiments is provided.},
doi = {10.1063/1.2775912},
journal = {AIP Conf.Proc.928:178-185,2007},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share:
  • We present combined searches for the low mass Standard Model Higgs boson at a center-of-mass energy of {radical}s = 1.96 TeV, using up to 5 fb{sup -1} of data collected with the D0 detector at the Fermilab Tevatron collider. The major contributing processes are associated production (WH {yields} lvbb, ZH {yields} vvbb, ZH {yields} llbb). The significant improvements across the full mass range resulting from the larger data sets and improved analyses as well as future prospects are discussed.
  • We present the result of the searches for a low mass Standard Model Higgs boson performed at the Tevatron p{bar p} collider ({radical}s = 1.96 TeV) by the CDF and D0 experiments with an integrated luminosity of up to 8.5 fb{sup -1}. Individual searches are discussed and classified according to their sensitivity. Primary channels rely on the associate production with a vector boson (WH or ZH) and the H {yields} b{bar b} decay channel (favored for M{sub H} {approx}< 135 GeV/c{sup 2}). Event selection is based on the leptonic decay of the vector boson and the identification of b-hadron enrichedmore » jets. Each individual channel is sensitive, for M{sub H} = 115 GeV/c{sup 2}, to less than 5 times the SM expected cross section and the most sensitive channels can exclude a production cross section of 2.3 x {sigma}{sub H}{sup SM}. Secondary channels rely on a variety of final states. Although they are from 2 to 5 times less sensitive than any primary channel, they contribute to the Tevatron combination and, in some cases, they pose strong constrains on exotic Higgs boson models.« less
  • The BABAR Collaboration has performed three searches for a light Higgs boson, A{sup 0}, in radiative Upsilon ({Upsilon}) decays: {Upsilon}(3S) {yields} {gamma}A{sup 0}, A{sup 0} {yields} {tau}{sup +}{tau}{sup -}; {Upsilon}(nS) {yields} {gamma}A{sup 0}, A{sup 0} {yields} {mu}{sup +}{mu}{sup -} (n = 2,3); and {Upsilon}(3S) {yields} {gamma}A{sup 0}, A{sup 0} {yields} invisible. Such a Higgs boson (A{sup 0}) appears in the Next-to-Minimal Supersymmetric extensions of the Standard Model, where a light CP-odd Higgs boson couples strongly to b-quarks. The searches are based on data samples that consist of 122 x 10{sup 6} {Upsilon}(3S) and 99 x 10{sup 6} {Upsilon}(2S) decays, collectedmore » by the BABAR detector at the SLAC National Accelerator Laboratory. The searches reveal no evidence for an A{sup 0}, and product of branching fractions upper limits, at 90% C.L., of (1.5-16) x 10{sup -5}, (0.44-44) x 10{sup -6}, and (0.7-31) x 10{sup -6} were obtained for these searches, respectively. Also, we set the upper limits {Beta}({eta}{sub b} {yields} {tau}{sup +}{tau}{sup -}) < 8% and {Beta}({eta}{sub b} {yields} {mu}{sup +}{mu}{sup -}) < 0.9%.« less
  • We present the current status of searches for a low mass Standard Model Higgs boson (M_H below ~ 135 GeV/c^2) using data collected from ppbar collisions at the Fermilab Tevatron collider at \sqrt{s}= 1.96 TeV. A summary of the latest results from the CDF and D0 collaborations is reported in this paper, focusing in particular on ongoing efforts to increase overall search sensitivity through improvements to the analysis methods.
  • Preliminary results from a Fermilab study of the sensitivity for Higgs boson production at the upgraded Tevatron are presented. The study extends previous results by systematically combining results for all decay channels, considering the production of higher mass Higgs bosons and interpreting the results in the context of super-symmetric Higgs production as well as Standard Model production. New analysis methods significantly improve the sensitivity. With 20 fb{sup {minus}1} of accumulated data, the Higgs discovery reach can be extended to M{sub H} = 180 GeV.