Search results for "MSSM"
showing 7 items of 7 documents
Search for neutral MSSM Higgs bosons at LEP
2006
The four LEP collaborations, ALEPH, DELPHI, L3 and OPAL, have searched for the neutral Higgs bosons which are predicted by the Minimal Supersymmetric Standard Model (MSSM). The data of the four collaborations are statistically combined and examined for their consistency with the background hypothesis and with a possible Higgs boson signal. The combined LEP data show no significant excess of events which would indicate the production of Higgs bosons. The search results are used to set upper bounds on the cross-sections of various Higgs-like event topologies. The results are interpreted within the MSSM in a number of "benchmark" models, including CP-conserving and CP-violating scenarios. Thes…
Limits on neutral Higgs boson production in the forward region in $pp$ collisions at $\sqrt{s} = 7$ TeV
2013
Limits on the cross-section times branching fraction for neutral Higgs bosons, produced in p p collisions at root s = 7 TeV, and decaying to two tau leptons with pseudorapidities between 2.0 and 4.5, are presented. The result is based on a dataset, corresponding to an integrated luminosity of 1.0 fb(-1), collected with the LHCb detector. Candidates are identified by reconstructing final states with two muons, a muon and an electron, a muon and a hadron, or an electron and a hadron. A model independent upper limit at the 95% confidence level is set on a neutral Higgs boson cross-section times branching fraction. It varies from 8.6 pb for a Higgs boson mass of 90 GeV to 0.7 pb for a Higgs bos…
SUSY-GUTs, SUSY-Seesaw and the Neutralino Dark Matter
2007
19 pages, 7 figures.-- ISI Article Identifier: 000249788800048.-- ArXiv pre-print available at: http://arxiv.org/abs/0704.3518
Search for Neutral Higgs Bosons in Events with Multiple Bottom Quarks at the Tevatron
2012
The combination of searches performed by the CDF and D0 collaborations at the Fermilab Tevatron Collider for neutral Higgs bosons produced in association with b quarks is reported. The data, corresponding to 2.6fb -1 of integrated luminosity at CDF and 5.2fb -1 at D0, have been collected in final states containing three or more b jets. Upper limits are set on the cross section multiplied by the branching ratio varying between 44 pb and 0.7 pb in the Higgs boson mass range 90 to 300 GeV, assuming production of a narrow scalar boson. Significant enhancements to the production of Higgs bosons can be found in theories beyond the standard model, for example, in supersymmetry. The results are int…
Discarding a 125 GeV heavy Higgs in an MSSM model with explicit CP-violation
2016
AbstractCurrent experimental constraints prove being enough to rule out the possibility of the mh∼125 GeV Higgs found at LHC being a heavy Higgs in a general MSSM context, even with explicit CP violation in the Higgs potential. Differently than what has been done in prior studies, we perform this job analitically, with expressions related to a few observables. Te relevance of ττ production through Higgs and BR(B→Xsγ) processes is emphasized, since they are enough to erase the possibility of finding an MSSM neutral Higgs lighter than the scalar discovered at LHC.
A BSM hunting guide after Run I
2017
La tesis doctoral tiene como objetivo explorar algunos de los diversos campos de actividad de la física de partículas tras el descubrimiento del bosón de Higgs en el LHC. Por ello, incluye trabajo tanto en extensiones del Modelo Estándar (SM) como la Supersimetría (SUSY), la formación de la estructura del universo tras el periodo de inflación primigenia y un modelo para neutrinos dextrógiros (RH-neutrino). Todo ello ha sido analizado con un cariz fenomenológico, para que la teoría no se despegue demasiado de los diferentes experimentos que pueden confirmarla o refutarla. En cuanto a SUSY se refiere, se decidió hacer un estudio fenomenológico del sector de Higgs de MSSM (modelo con un número…
Measurement of the Higgs boson coupling with tau leptons and search for an additional neutral MSSM Higgs boson with the ATLAS detector
2018
El Modelo Estándar de física de partículas (SM), la teoría que describe el comportamiento de las partículas subatómicas, ha sido un éxito en su precisión y exactitud. Uno de sus pilares básicos es el mecanismo de Higgs, que regula los términos de masa de las partículas fundamentales. La partícula responsable de este mecanismo es el bosón de Higgs, que fue descubierto en 2012 en los experimentos ATLAS y CMS del colisionador de partículas LHC del CERN, mediante el análisis de su acoplamiento a partículas bosónicas (fotones y bosones W y Z). Tras su descubrimiento, es necesario confirmar que el resto sus propiedades se corresponden con las predichas por el SM, como, por ejemplo, su acoplamient…