Probing minimal supergravity at the CERN LHC for large tan&hthinsp;{beta}

doi:https://doi.org/10.1103/PhysRevD.59.055014

Title: Probing minimal supergravity at the CERN LHC for large tan&hthinsp;{beta}

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Abstract

For large values of the minimal supergravity model parameter tan&hthinsp;{beta}, the tau lepton and the bottom quark Yukawa couplings become large, leading to reduced masses of {tau} sleptons and {ital b} squarks relative to their first and second generation counterparts, and to enhanced decays of charginos and neutralinos to {tau} leptons and {ital b} quarks. We evaluate the reach of the CERN Large Hadron Collider (LHC) pp collider for supersymmetry in the MSUGRA model parameter space. We find that values of m{sub {tilde g}}{approximately}1500{endash}2000 GeV can be probed with just 10 fb{sup {minus}1} of integrated luminosity for tan&hthinsp;{beta} values as high as 45, so that MSUGRA cannot escape the scrutiny of LHC experiments by virtue of having a large value of tan&hthinsp;{beta}. We also perform a case study of an MSUGRA model at tan&hthinsp;{beta}=45 where {tilde Z}{sub 2}{r_arrow}{tau}{tilde {tau}}{sub 1} and {tilde W}{sub 1}{r_arrow}{tilde {tau}}{sub 1}{nu}{sub {tau}} with {approximately}100{percent} branching fraction. In this case, at least within our simplistic study, we show that a di-tau mass edge, which determines the value of m{sub {tilde Z}{sub 2}}{minus}m{sub {tilde Z}{sub 1}}, can still be reconstructed. This information can be used as a starting point for reconstructing SUSY cascade decays on an event-by-eventmore »« less

Authors:

Baer, H; Chen, C ^[1]; Drees, M ^[2]; Paige, F ^[3]; Tata, X ^[4]

Department of Physics, Florida State University, Tallahassee, Florida 32306 (United States)
IFT, Universidade Estadual Paulista, 01405-900 Sao Paulo (Brazil)
Brookhaven National Laboratory, Upton, New York 11973 (United States)
Department of Physics and Astronomy, University of Hawaii, Honolulu, Hawaii 96822 (United States)

Publication Date:: 1999-03-01

OSTI Identifier:: 310027

Resource Type:: Journal Article

Journal Name:: Physical Review, D

Additional Journal Information:: Journal Volume: 59; Journal Issue: 5; Other Information: PBD: Mar 1999

Country of Publication:: United States

Language:: English

Subject:: 66 PHYSICS; TAU PARTICLES; SUPERGRAVITY; SUPERSYMMETRY; SPARTICLES; YUKAWA POTENTIAL; PROTON-PROTON INTERACTIONS; CERN

Citation Formats


                    Baer, H, Chen, C, Drees, M, Paige, F, and Tata, X. Probing minimal supergravity at the CERN LHC for large tan&hthinsp;{beta}.  United States: N. p., 1999. 
        Web.  doi:10.1103/PhysRevD.59.055014.

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                    Baer, H, Chen, C, Drees, M, Paige, F, & Tata, X. Probing minimal supergravity at the CERN LHC for large tan&hthinsp;{beta}.  United States.  https://doi.org/10.1103/PhysRevD.59.055014

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                    Baer, H, Chen, C, Drees, M, Paige, F, and Tata, X. Mon .  
        "Probing minimal supergravity at the CERN LHC for large tan&hthinsp;{beta}".  United States.  https://doi.org/10.1103/PhysRevD.59.055014.

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@article{osti_310027,

  title        = {Probing minimal supergravity at the CERN LHC for large tan&hthinsp;{beta}},

  author       = {Baer, H and Chen, C and Drees, M and Paige, F and Tata, X},

  abstractNote = {For large values of the minimal supergravity model parameter tan&hthinsp;{beta}, the tau lepton and the bottom quark Yukawa couplings become large, leading to reduced masses of {tau} sleptons and {ital b} squarks relative to their first and second generation counterparts, and to enhanced decays of charginos and neutralinos to {tau} leptons and {ital b} quarks. We evaluate the reach of the CERN Large Hadron Collider (LHC) pp collider for supersymmetry in the MSUGRA model parameter space. We find that values of m{sub {tilde g}}{approximately}1500{endash}2000 GeV can be probed with just 10 fb{sup {minus}1} of integrated luminosity for tan&hthinsp;{beta} values as high as 45, so that MSUGRA cannot escape the scrutiny of LHC experiments by virtue of having a large value of tan&hthinsp;{beta}. We also perform a case study of an MSUGRA model at tan&hthinsp;{beta}=45 where {tilde Z}{sub 2}{r_arrow}{tau}{tilde {tau}}{sub 1} and {tilde W}{sub 1}{r_arrow}{tilde {tau}}{sub 1}{nu}{sub {tau}} with {approximately}100{percent} branching fraction. In this case, at least within our simplistic study, we show that a di-tau mass edge, which determines the value of m{sub {tilde Z}{sub 2}}{minus}m{sub {tilde Z}{sub 1}}, can still be reconstructed. This information can be used as a starting point for reconstructing SUSY cascade decays on an event-by-event basis, and can provide a strong constraint in determining the underlying model parameters. Finally, we show that for large tan&hthinsp;{beta}, there can be an observable excess of {tau} leptons, and argue that {tau} signals might serve to provide new information about the underlying model framework. {copyright} {ital 1999} {ital The American Physical Society}},

  doi          = {10.1103/PhysRevD.59.055014},

  url          = {https://www.osti.gov/biblio/310027},
  journal      = {Physical Review, D},
number       = 5,

  volume       = 59,

  place        = {United States},

  year         = {1999},

  month        = {3}

}

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