Ahmed Ismail

Argonne National Laboratory

*This is an algorithmically generated author record based on publicly available information.

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Argonne National Laboratory

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University of Illinois Chicago

Research Subjects

High Energy Physics

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Ahmed Ismail has a total of 16 co-authors. Here are the top co-authors by number of shared publications:

Thomas G. Rizzo
SLAC National Accelerator Laboratory
9 shared publications
JoAnne L. Hewett
SLAC National Accelerator Laboratory Stanford University Menlo Park CA USA
7 shared publications
M. Cahill-Rowley
SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
5 shared publications
M. Cahill-Rowley
SLAC National Accelerator Laboratory Menlo Park CA USA
3 shared publications
Alex Drlica-Wagner
University of Chicago
2 shared publications
Diptimoy Ghosh
Indian Institute of Science Education and Research Pune
2 shared publications

Latest Publications

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Cited by 15
- 16 February 2016
- Published by American Physical Society (APS) in Physical Review D
$C P$ -violating phenomenological MSSM
by Joshua Berger, Matthew W. Cahill-Rowley, Diptimoy Ghosh, JoAnne L. Hewett, Ahmed Ismail, Thomas G. Rizzo
We investigate the sensitivity of the next generation of flavor-based low-energy experiments to probe the supersymmetric parameter space in the context of the phenomenological minimal supersymmetric Standard Model and examine the complementarity with direct searches for supersymmetry at the 13 TeV LHC in a quantitative manner. To this end, we enlarge the previously studied phenomenological minimal supersymmetric Standard Model parameter space to include all physical nonzero $C P$ -violating phases, namely those associated with the gaugino mass parameters; Higgsino mass parameter and the trilinear couplings of the top quark, bottom quark, and tau lepton. We find that future electric dipole moment and flavor measurements can have a strong impact on the viability of these models even if the sparticle spectrum is out of reach of the 13 TeV LHC. In particular, the lack of positive signals in future low-energy probes would exclude values of the phases between $O (1 0^{- 2})$ and $O (1 0^{- 1})$ . We also find regions of parameter space where large phases remain allowed due to cancellations. Most interestingly, in some rare processes, such as $BR (B_{s} \to μ^{+} μ^{-})$ , we find that contributions arising from $C P$ -violating phases can bring the potentially large supersymmetry contributions into better agreement with experiment and Standard Model predictions.
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- 16 February 2016
- Published by American Physical Society (APS) in Physical Review D
Open Access
$C P$ -violating phenomenological MSSM
by Joshua Berger, Matthew W. Cahill-Rowley, Diptimoy Ghosh, JoAnne L. Hewett, Ahmed Ismail, Thomas G. Rizzo
We investigate the sensitivity of the next generation of flavor-based low-energy experiments to probe the supersymmetric parameter space in the context of the phenomenological minimal supersymmetric Standard Model and examine the complementarity with direct searches for supersymmetry at the 13 TeV LHC in a quantitative manner. To this end, we enlarge the previously studied phenomenological minimal supersymmetric Standard Model parameter space to include all physical nonzero $C P$ -violating phases, namely those associated with the gaugino mass parameters; Higgsino mass parameter and the trilinear couplings of the top quark, bottom quark, and tau lepton. We find that future electric dipole moment and flavor measurements can have a strong impact on the viability of these models even if the sparticle spectrum is out of reach of the 13 TeV LHC. In particular, the lack of positive signals in future low-energy probes would exclude values of the phases between $O (1 0^{- 2})$ and $O (1 0^{- 1})$ . We also find regions of parameter space where large phases remain allowed due to cancellations. Most interestingly, in some rare processes, such as $BR (B_{s} \to μ^{+} μ^{-})$ , we find that contributions arising from $C P$ -violating phases can bring the potentially large supersymmetry contributions into better agreement with experiment and Standard Model predictions.
Cited by 15
Open Access
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- 15 January 2016
- Published by arXiv in arXiv
The CP-Violating pMSSM
by Joshua Berger, Matthew W. Cahill-Rowley, Diptimoy Ghosh, JoAnne L. Hewett, Ahmed Ismail, Thomas G. Rizzo
We investigate the sensitivity of the next generation of flavor-based low-energy experiments to probe the supersymmetric parameter space in the context of the phenomenological MSSM (pMSSM), and examine the complementarity with direct searches for Supersymmetry at the 13 TeV LHC in a quantitative manner. To this end, we enlarge the previously studied pMSSM parameter space to include all physical non-zero CP-violating phases, namely those associated with the gaugino mass parameters, Higgsino mass parameter, and the tri-linear couplings of the top quark, bottom quark and tau lepton. We find that future electric dipole moment and flavor measurements can have a strong impact on the viability of these models even if the sparticle spectrum is out of reach of the 13 TeV LHC. In particular, the lack of positive signals in future low-energy probes would exclude values of the phases between ${\cal O}(10^{-2})$ and ${\cal O}(10^{-1})$. We also find regions of parameter space where large phases remain allowed due to cancellations. Most interestingly, in some rare processes, such as BR($B_s \to \mu^+ \mu^-$ ), we find that contributions arising from CP-violating phases can bring the potentially large SUSY contributions into better agreement with experiment and Standard Model predictions.
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Google Scholar
- 15 January 2016
- Published by arXiv in arXiv
Open Access
The CP-Violating pMSSM
by Joshua Berger, Matthew W. Cahill-Rowley, Diptimoy Ghosh, JoAnne L. Hewett, Ahmed Ismail, Thomas G. Rizzo
We investigate the sensitivity of the next generation of flavor-based low-energy experiments to probe the supersymmetric parameter space in the context of the phenomenological MSSM (pMSSM), and examine the complementarity with direct searches for Supersymmetry at the 13 TeV LHC in a quantitative manner. To this end, we enlarge the previously studied pMSSM parameter space to include all physical non-zero CP-violating phases, namely those associated with the gaugino mass parameters, Higgsino mass parameter, and the tri-linear couplings of the top quark, bottom quark and tau lepton. We find that future electric dipole moment and flavor measurements can have a strong impact on the viability of these models even if the sparticle spectrum is out of reach of the 13 TeV LHC. In particular, the lack of positive signals in future low-energy probes would exclude values of the phases between ${\cal O}(10^{-2})$ and ${\cal O}(10^{-1})$. We also find regions of parameter space where large phases remain allowed due to cancellations. Most interestingly, in some rare processes, such as BR($B_s \to \mu^+ \mu^-$ ), we find that contributions arising from CP-violating phases can bring the potentially large SUSY contributions into better agreement with experiment and Standard Model predictions.
Open Access
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Google Scholar
Cited by 15
- 21 October 2015
- Published by American Physical Society (APS) in Physical Review D
ATLAS $Z +$ missing transverse energy excess in the MSSM
by M. Cahill-Rowley, J. L. Hewett, A. Ismail, T. G. Rizzo
We demonstrate that the $3 σ$ excess observed by ATLAS in the $Z + MET$ channel can be explained within the context of the MSSM. Using the freedom inherent in the pMSSM, we perform a detailed analysis of the parameter space and find a scenario that describes the excess while simultaneously complying with all other search constraints from the Run I data at 7 and 8 TeV, including the $Z + MET$ analysis by CMS. We generate a small sample of simplified models, using promising models from our existing pMSSM sample as seeds, and study their properties. The successful region is described by the production of $1^{st} / 2^{nd}$ generation squark pairs, followed by their decay into a bino-like neutralino which in turn decays into a Higgsino-like LSP triplet by emitting a $Z$ boson, i.e., $\tilde{q} \to \tilde{B} \to \tilde{h}$ with $\tilde{q} = {\tilde{Q}}_{L}$ , ${\tilde{u}}_{R}$ , or ${\tilde{d}}_{R}$ . The sweet spot for the sparticle spectrum is found to have squark masses in the 500–750 GeV range, with bino masses near 350 GeV with a mass splitting of 150–200 GeV with the Higgsino LSP. If this excess holds, then this scenario predicts that a signal will be observed in the $0 l + jets$ and/or $1 l + jets$ searches in the early operations of Run II.
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- 21 October 2015
- Published by American Physical Society (APS) in Physical Review D
Open Access
ATLAS $Z +$ missing transverse energy excess in the MSSM
by M. Cahill-Rowley, J. L. Hewett, A. Ismail, T. G. Rizzo
We demonstrate that the $3 σ$ excess observed by ATLAS in the $Z + MET$ channel can be explained within the context of the MSSM. Using the freedom inherent in the pMSSM, we perform a detailed analysis of the parameter space and find a scenario that describes the excess while simultaneously complying with all other search constraints from the Run I data at 7 and 8 TeV, including the $Z + MET$ analysis by CMS. We generate a small sample of simplified models, using promising models from our existing pMSSM sample as seeds, and study their properties. The successful region is described by the production of $1^{st} / 2^{nd}$ generation squark pairs, followed by their decay into a bino-like neutralino which in turn decays into a Higgsino-like LSP triplet by emitting a $Z$ boson, i.e., $\tilde{q} \to \tilde{B} \to \tilde{h}$ with $\tilde{q} = {\tilde{Q}}_{L}$ , ${\tilde{u}}_{R}$ , or ${\tilde{d}}_{R}$ . The sweet spot for the sparticle spectrum is found to have squark masses in the 500–750 GeV range, with bino masses near 350 GeV with a mass splitting of 150–200 GeV with the Higgsino LSP. If this excess holds, then this scenario predicts that a signal will be observed in the $0 l + jets$ and/or $1 l + jets$ searches in the early operations of Run II.
Cited by 15
Open Access
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Google Scholar
- 18 June 2015
- Published by arXiv in arXiv
The ATLAS Z + MET Excess in the MSSM
by M. Cahill-Rowley, J. L. Hewett, A. Ismail, T. G. Rizzo
We demonstrate that the $3\sigma$ excess observed by ATLAS in the Z + MET channel can be explained within the context of the MSSM. Using the freedom inherent in the pMSSM, we perform a detailed analysis of the parameter space and find a scenario that describes the excess while simultaneously complying with all other search constraints from the Run I data at 7 and 8 TeV, including the Z + MET analysis by CMS. We generate a small sample of simplified models, using promising models from our existing pMSSM sample as seeds, and study their properties. The successful region is described by the production of 1st/2nd generation squark pairs, followed by their decay into a bino-like neutralino which in turn decays into a Higgsino-like LSP triplet by emitting a Z boson, i.e., $\tilde q\to\tilde B\to\tilde h$ with $\tilde q = \tilde Q_L,\tilde u_R,$ or $\tilde d_R$. The sweet spot for the sparticle spectrum is found to have squark masses in the 500-750 GeV range, with bino masses near 350 GeV with a mass splitting of 150-200 GeV with the Higgsino LSP. If this excess holds, then this scenario predicts that a signal will be observed in the 0l + jets and/or 1l + jets searches in the early operations of Run II.
Website
Google Scholar
- 18 June 2015
- Published by arXiv in arXiv
Open Access
The ATLAS Z + MET Excess in the MSSM
by M. Cahill-Rowley, J. L. Hewett, A. Ismail, T. G. Rizzo
We demonstrate that the $3\sigma$ excess observed by ATLAS in the Z + MET channel can be explained within the context of the MSSM. Using the freedom inherent in the pMSSM, we perform a detailed analysis of the parameter space and find a scenario that describes the excess while simultaneously complying with all other search constraints from the Run I data at 7 and 8 TeV, including the Z + MET analysis by CMS. We generate a small sample of simplified models, using promising models from our existing pMSSM sample as seeds, and study their properties. The successful region is described by the production of 1st/2nd generation squark pairs, followed by their decay into a bino-like neutralino which in turn decays into a Higgsino-like LSP triplet by emitting a Z boson, i.e., $\tilde q\to\tilde B\to\tilde h$ with $\tilde q = \tilde Q_L,\tilde u_R,$ or $\tilde d_R$. The sweet spot for the sparticle spectrum is found to have squark masses in the 500-750 GeV range, with bino masses near 350 GeV with a mass splitting of 150-200 GeV with the Higgsino LSP. If this excess holds, then this scenario predicts that a signal will be observed in the 0l + jets and/or 1l + jets searches in the early operations of Run II.
Open Access
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Google Scholar
Cited by 82
- 11 March 2015
- Published by American Physical Society (APS) in Physical Review D
Complementarity of dark matter searches in the phenomenological MSSM
by M. Cahill-Rowley, R. Cotta, A. Drlica-Wagner, S. Funk, J. L. Hewett, A. Ismail, T. G. Rizzo, M. Wood
As is well known, the search for and eventual identification of dark matter in supersymmetry requires a simultaneous, multipronged approach with important roles played by the LHC as well as both direct and indirect dark matter detection experiments. We examine the capabilities of these approaches in the 19-parameter phenomenological MSSM which provides a general framework for complementarity studies of neutralino dark matter. We summarize the sensitivity of dark matter searches at the 7 and 8 (and eventually 14) TeV LHC, combined with those by Fermi, CTA, IceCube/DeepCore, COUPP, LZ and XENON. The strengths and weaknesses of each of these techniques are examined and contrasted and their interdependent roles in covering the model parameter space are discussed in detail. We find that these approaches explore orthogonal territory and that advances in each are necessary to cover the supersymmetric weakly interacting massive particle parameter space. We also find that different experiments have widely varying sensitivities to the various dark matter annihilation mechanisms, some of which would be completely excluded by null results from these experiments.
Website
Google Scholar
- 11 March 2015
- Published by American Physical Society (APS) in Physical Review D
Open Access
Complementarity of dark matter searches in the phenomenological MSSM
by M. Cahill-Rowley, R. Cotta, A. Drlica-Wagner, S. Funk, J. L. Hewett, A. Ismail, T. G. Rizzo, M. Wood
As is well known, the search for and eventual identification of dark matter in supersymmetry requires a simultaneous, multipronged approach with important roles played by the LHC as well as both direct and indirect dark matter detection experiments. We examine the capabilities of these approaches in the 19-parameter phenomenological MSSM which provides a general framework for complementarity studies of neutralino dark matter. We summarize the sensitivity of dark matter searches at the 7 and 8 (and eventually 14) TeV LHC, combined with those by Fermi, CTA, IceCube/DeepCore, COUPP, LZ and XENON. The strengths and weaknesses of each of these techniques are examined and contrasted and their interdependent roles in covering the model parameter space are discussed in detail. We find that these approaches explore orthogonal territory and that advances in each are necessary to cover the supersymmetric weakly interacting massive particle parameter space. We also find that different experiments have widely varying sensitivities to the various dark matter annihilation mechanisms, some of which would be completely excluded by null results from these experiments.
Cited by 82
Open Access
Website
Google Scholar
Cited by 66
- 3 March 2015
- Published by American Physical Society (APS) in Physical Review D
Lessons and prospects from the pMSSM after LHC Run I
by M. Cahill-Rowley, J. L. Hewett, A. Ismail, T. G. Rizzo
We study SUSY signatures at the 7, 8 and 14 TeV LHC employing the 19-parameter, R-parity conserving p(henomenological)MSSM, in the scenario with a neutralino lightest supersymmetric particle (LSP). Our results were obtained via a fast Monte Carlo simulation of the ATLAS SUSY analysis suite. The flexibility of this framework allows us to study a wide variety of SUSY phenomena simultaneously and to probe for weak spots in existing SUSY search analyses. We determine the ranges of the sparticle masses that are either disfavored or allowed after the searches with the 7 and 8 TeV data sets are combined. We find that natural SUSY models with light squarks and gluinos remain viable. We extrapolate to 14 TeV with both $300 {fb}^{- 1}$ and $3 {ab}^{- 1}$ of integrated luminosity and determine the expected sensitivity of the $jets + MET$ and stop searches to the pMSSM parameter space. We find that the high-luminosity LHC will be powerful in probing SUSY with neutralino LSPs and can provide a more definitive statement on the existence of natural supersymmetry.
Website
Google Scholar
- 3 March 2015
- Published by American Physical Society (APS) in Physical Review D
Open Access
Lessons and prospects from the pMSSM after LHC Run I
by M. Cahill-Rowley, J. L. Hewett, A. Ismail, T. G. Rizzo
We study SUSY signatures at the 7, 8 and 14 TeV LHC employing the 19-parameter, R-parity conserving p(henomenological)MSSM, in the scenario with a neutralino lightest supersymmetric particle (LSP). Our results were obtained via a fast Monte Carlo simulation of the ATLAS SUSY analysis suite. The flexibility of this framework allows us to study a wide variety of SUSY phenomena simultaneously and to probe for weak spots in existing SUSY search analyses. We determine the ranges of the sparticle masses that are either disfavored or allowed after the searches with the 7 and 8 TeV data sets are combined. We find that natural SUSY models with light squarks and gluinos remain viable. We extrapolate to 14 TeV with both $300 {fb}^{- 1}$ and $3 {ab}^{- 1}$ of integrated luminosity and determine the expected sensitivity of the $jets + MET$ and stop searches to the pMSSM parameter space. We find that the high-luminosity LHC will be powerful in probing SUSY with neutralino LSPs and can provide a more definitive statement on the existence of natural supersymmetry.
Cited by 66
Open Access
Website
Google Scholar
Cited by 24
- 18 November 2014
- Published by American Physical Society (APS) in Physical Review D
Higgs boson coupling measurements and direct searches as complementary probes of the phenomenological MSSM
by M. Cahill-Rowley, J. Hewett, A. Ismail, T. Rizzo
The parameter space of the minimal supersymmetric standard model (MSSM) can be probed via many avenues, such as by precision measurements of the couplings of the $\sim 126 GeV$ Higgs boson, as well as the direct searches for supersymmetry (SUSY) partners. We examine the connection between these two collider observables at the LHC and International Linear Collider (ILC) in the $19 / 20$ -parameter phenomenological MSSM (pMSSM). Within this scenario, we address two questions: (i) How will potentially null direct searches for SUSY at the LHC influence the predicted properties of the lightest SUSY Higgs boson? (ii) What can be learned about the properties of the superpartners from precision measurements of the Higgs boson couplings? In this paper, we examine these questions by employing three different large sets of pMSSM models with either the neutralino or gravitino being the lightest supersymmetric particle. We make use of the ATLAS direct SUSY searches at the $7 / 8 TeV$ LHC as well as expected results from 14 TeV operations, and the anticipated precision measurements of the Higgs boson couplings at the 14 TeV LHC and at the ILC. We demonstrate that the future Higgs coupling determinations can deeply probe the pMSSM parameter space and, in particular, can observe the effects of models that are projected to evade the direct searches at the 14 TeV LHC with $3 {ab}^{- 1}$ of integrated luminosity. In addition, we compare the reach of the Higgs coupling determinations to the direct heavy Higgs searches in the $M_{A} - \tan β$ plane and show that they cover orthogonal regions. This analysis demonstrates the complementarity of the direct and indirect approaches in searching for supersymmetry, and the importance of precision studies of the properties of the Higgs boson.
Website
Google Scholar
- 18 November 2014
- Published by American Physical Society (APS) in Physical Review D
Open Access
Higgs boson coupling measurements and direct searches as complementary probes of the phenomenological MSSM
by M. Cahill-Rowley, J. Hewett, A. Ismail, T. Rizzo
The parameter space of the minimal supersymmetric standard model (MSSM) can be probed via many avenues, such as by precision measurements of the couplings of the $\sim 126 GeV$ Higgs boson, as well as the direct searches for supersymmetry (SUSY) partners. We examine the connection between these two collider observables at the LHC and International Linear Collider (ILC) in the $19 / 20$ -parameter phenomenological MSSM (pMSSM). Within this scenario, we address two questions: (i) How will potentially null direct searches for SUSY at the LHC influence the predicted properties of the lightest SUSY Higgs boson? (ii) What can be learned about the properties of the superpartners from precision measurements of the Higgs boson couplings? In this paper, we examine these questions by employing three different large sets of pMSSM models with either the neutralino or gravitino being the lightest supersymmetric particle. We make use of the ATLAS direct SUSY searches at the $7 / 8 TeV$ LHC as well as expected results from 14 TeV operations, and the anticipated precision measurements of the Higgs boson couplings at the 14 TeV LHC and at the ILC. We demonstrate that the future Higgs coupling determinations can deeply probe the pMSSM parameter space and, in particular, can observe the effects of models that are projected to evade the direct searches at the 14 TeV LHC with $3 {ab}^{- 1}$ of integrated luminosity. In addition, we compare the reach of the Higgs coupling determinations to the direct heavy Higgs searches in the $M_{A} - \tan β$ plane and show that they cover orthogonal regions. This analysis demonstrates the complementarity of the direct and indirect approaches in searching for supersymmetry, and the importance of precision studies of the properties of the Higgs boson.
Cited by 24
Open Access
Website
Google Scholar
- 24 October 2014
- Published by arXiv in arXiv
Lessons and Prospects from the pMSSM after LHC Run I: Neutralino LSP
by M. Cahill-Rowley, J. L. Hewett, A. Ismail, T. G. Rizzo
We study SUSY signatures at the 7, 8 and 14 TeV LHC employing the 19-parameter, R-Parity conserving p(henomenological)MSSM, in the scenario with a neutralino LSP. Our results were obtained via a fast Monte Carlo simulation of the ATLAS SUSY analysis suite. The flexibility of this framework allows us to study a wide variety of SUSY phenomena simultaneously and to probe for weak spots in existing SUSY search analyses. We determine the ranges of the sparticle masses that are either disfavored or allowed after the searches with the 7 and 8 TeV data sets are combined. We find that natural SUSY models with light squarks and gluinos remain viable. We extrapolate to 14 TeV with both 300 fb$^{-1}$ and 3 ab$^{-1}$ of integrated luminosity and determine the expected sensitivity of the jets + MET and stop searches to the pMSSM parameter space. We find that the high-luminosity LHC will be powerful in probing SUSY with neutralino LSPs and can provide a more definitive statement on the existence of natural Supersymmetry.
Website
Google Scholar
- 24 October 2014
- Published by arXiv in arXiv
Open Access
Lessons and Prospects from the pMSSM after LHC Run I: Neutralino LSP
by M. Cahill-Rowley, J. L. Hewett, A. Ismail, T. G. Rizzo
We study SUSY signatures at the 7, 8 and 14 TeV LHC employing the 19-parameter, R-Parity conserving p(henomenological)MSSM, in the scenario with a neutralino LSP. Our results were obtained via a fast Monte Carlo simulation of the ATLAS SUSY analysis suite. The flexibility of this framework allows us to study a wide variety of SUSY phenomena simultaneously and to probe for weak spots in existing SUSY search analyses. We determine the ranges of the sparticle masses that are either disfavored or allowed after the searches with the 7 and 8 TeV data sets are combined. We find that natural SUSY models with light squarks and gluinos remain viable. We extrapolate to 14 TeV with both 300 fb$^{-1}$ and 3 ab$^{-1}$ of integrated luminosity and determine the expected sensitivity of the jets + MET and stop searches to the pMSSM parameter space. We find that the high-luminosity LHC will be powerful in probing SUSY with neutralino LSPs and can provide a more definitive statement on the existence of natural Supersymmetry.
Open Access
Website
Google Scholar
- 25 July 2014
- Published by arXiv in arXiv
Higgs Coupling Measurements and Direct Searches as Complementary Probes of the pMSSM
by M. Cahill-Rowley, J. Hewett, A. Ismail, T. Rizzo
The parameter space of the MSSM can be probed via many avenues, such as by pre- cision measurements of the couplings of the ~126 GeV Higgs boson, as well as the direct searches for SUSY partners. We examine the connection between these two collider observables at the LHC and ILC in the 19/20-parameter p(henomenological)MSSM. Within this scenario, we address two questions: (i) How will potentially null direct searches for SUSY at the LHC influence the predicted properties of the lightest SUSY Higgs boson? (ii) What can be learned about the properties of the superpartners from precision measurements of the Higgs boson couplings? In this paper, we examine these questions by employing three different large sets of pMSSM models with either the neutralino or gravitino being the LSP. We make use of the ATLAS direct SUSY searches at the 7/8 TeV LHC as well as expected results from 14 TeV operations, and the anticipated precision measurements of the Higgs Boson couplings at the 14 TeV LHC and at the ILC. We demonstrate that the future Higgs coupling determinations can deeply probe the pMSSM parameter space and, in particular, can observe the effects of models that are projected to evade the direct searches at the 14 TeV LHC with 3 inverse ab of integrated luminosity. In addition, we compare the reach of the Higgs coupling determinations to the direct heavy Higgs searches in the MA - tan beta plane and show that they cover orthogonal regions. This analysis demonstrates the complementarity of the direct and indirect approaches in searching for Supersymmetry, and the importance of precision studies of the properties of the Higgs Boson.
Website
Google Scholar
- 25 July 2014
- Published by arXiv in arXiv
Open Access
Higgs Coupling Measurements and Direct Searches as Complementary Probes of the pMSSM
by M. Cahill-Rowley, J. Hewett, A. Ismail, T. Rizzo
The parameter space of the MSSM can be probed via many avenues, such as by pre- cision measurements of the couplings of the ~126 GeV Higgs boson, as well as the direct searches for SUSY partners. We examine the connection between these two collider observables at the LHC and ILC in the 19/20-parameter p(henomenological)MSSM. Within this scenario, we address two questions: (i) How will potentially null direct searches for SUSY at the LHC influence the predicted properties of the lightest SUSY Higgs boson? (ii) What can be learned about the properties of the superpartners from precision measurements of the Higgs boson couplings? In this paper, we examine these questions by employing three different large sets of pMSSM models with either the neutralino or gravitino being the LSP. We make use of the ATLAS direct SUSY searches at the 7/8 TeV LHC as well as expected results from 14 TeV operations, and the anticipated precision measurements of the Higgs Boson couplings at the 14 TeV LHC and at the ILC. We demonstrate that the future Higgs coupling determinations can deeply probe the pMSSM parameter space and, in particular, can observe the effects of models that are projected to evade the direct searches at the 14 TeV LHC with 3 inverse ab of integrated luminosity. In addition, we compare the reach of the Higgs coupling determinations to the direct heavy Higgs searches in the MA - tan beta plane and show that they cover orthogonal regions. This analysis demonstrates the complementarity of the direct and indirect approaches in searching for Supersymmetry, and the importance of precision studies of the properties of the Higgs Boson.
Open Access
Website
Google Scholar
- 26 May 2014
- Published by arXiv in arXiv
Complementarity of Dark Matter Searches in the pMSSM
by Matthew Cahill-Rowley, Randy Cotta, Alex Drlica-Wagner, Stefan Funk, JoAnne Hewett, Ahmed Ismail, Tom Rizzo, Matthew Wood
As is well known, the search for and eventual identification of dark matter in supersymmetry requires a simultaneous, multi-pronged approach with important roles played by the LHC as well as both direct and indirect dark matter detection experiments. We examine the capabilities of these approaches in the 19-parameter p(henomenological)MSSM which provides a general framework for complementarity studies of neutralino dark matter. We summarize the sensitivity of dark matter searches at the 7, 8 (and eventually 14) TeV LHC, combined with those by \Fermi, CTA, IceCube/DeepCore, COUPP, LZ and XENON. The strengths and weaknesses of each of these techniques are examined and contrasted and their interdependent roles in covering the model parameter space are discussed in detail. We find that these approaches explore orthogonal territory and that advances in each are necessary to cover the Supersymmetric WIMP parameter space. We also find that different experiments have widely varying sensitivities to the various dark matter annihilation mechanisms, some of which would be completely excluded by null results from these experiments.
Website
Google Scholar
- 26 May 2014
- Published by arXiv in arXiv
Open Access
Complementarity of Dark Matter Searches in the pMSSM
by Matthew Cahill-Rowley, Randy Cotta, Alex Drlica-Wagner, Stefan Funk, JoAnne Hewett, Ahmed Ismail, Tom Rizzo, Matthew Wood
As is well known, the search for and eventual identification of dark matter in supersymmetry requires a simultaneous, multi-pronged approach with important roles played by the LHC as well as both direct and indirect dark matter detection experiments. We examine the capabilities of these approaches in the 19-parameter p(henomenological)MSSM which provides a general framework for complementarity studies of neutralino dark matter. We summarize the sensitivity of dark matter searches at the 7, 8 (and eventually 14) TeV LHC, combined with those by \Fermi, CTA, IceCube/DeepCore, COUPP, LZ and XENON. The strengths and weaknesses of each of these techniques are examined and contrasted and their interdependent roles in covering the model parameter space are discussed in detail. We find that these approaches explore orthogonal territory and that advances in each are necessary to cover the Supersymmetric WIMP parameter space. We also find that different experiments have widely varying sensitivities to the various dark matter annihilation mechanisms, some of which would be completely excluded by null results from these experiments.

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