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The potential of seeing supersymmetry (SUSY) at the CERN Large Hadron Collider (LHC) was studied by looking at 3 types of signals: dilepton events from slepton pair productions, trilepton events from chargino/neutralino productions and…

High Energy Physics - Phenomenology · Physics 2016-09-01 Chih-Hao Chen

Coherent analyses at future LHC and LC experiments can be used to explore the breaking mechanism of supersymmetry and to reconstruct the fundamental theory at high energies, in particular at the grand unification scale. This will be…

High Energy Physics - Phenomenology · Physics 2009-11-10 B. C. Allanach , G. A. Blair , A. Freitas , S. Kraml , H. -U. Martyn , G. Polesello , W. Porod , P. M. Zerwas

Presence of the light gravitino as dark matter candidate in a supersymmetric (SUSY) model opens up interesting collider signatures consisting of one or more hard photons together with multiple jets and missing transverse energy from the…

High Energy Physics - Phenomenology · Physics 2017-09-13 Juhi Dutta , Partha Konar , Subhadeep Mondal , Biswarup Mukhopadhyaya , Santosh Kumar Rai

The future electron-proton collider proposals, LHeC and FCC-he, can deliver $\mathcal{O}$(TeV) center-of-mass energy collisions, higher than most of the proposed lepton accelerators, with $\mathcal{O}$(ab$^{-1}$) luminosity, while…

High Energy Physics - Phenomenology · Physics 2019-03-27 David Curtin , Kaustubh Deshpande , Oliver Fischer , Jose Zurita

It is shown that if the sneutrino is the second lightest SUSY particle, then the decay products of squarks and gluinos produced at the TEVATRON collider tend to have i) more leptons, ii) smaller number of jets and iii) two or more carriers…

High Energy Physics - Phenomenology · Physics 2008-11-26 Amitava Datta , Monoranjan Guchait , Nirmalaya Parua

Searches for supersymmetric particles at LEP are first reviewed, with some emphasis on the mass limit for the lightest neutralino. The framework is the MSSM with R-parity conservation, with brief excursions towards mSUGRA and GMSB. Next,…

High Energy Physics - Experiment · Physics 2007-05-23 J. -F. Grivaz

In the event that R-Parity conserving supersymmetry (SUSY) is discovered at the LHC, a key issue which will need to be addressed will be the consistency of that signal with astrophysical and non-accelerator constraints on SUSY Dark Matter.…

High Energy Physics - Phenomenology · Physics 2009-11-11 M. M. Nojiri , G. Polesello , D. R. Tovey

We present a case study for the synergy of combined LHC and LC analyses in Susy searches in which simultaneous running of both machines is very important. In this study only light non-coloured Susy particles are accessible at a Linear…

High Energy Physics - Phenomenology · Physics 2007-05-23 G. Moortgat-Pick , K. Desch , J. Kalinowski , M. M. Nojiri , G. Polesello

We study the discovery reach of the Tevatron and the LHC for detecting a Higgs boson (h), predicted in composite models of the electroweak symmetry breaking or in supersymmetric theories, with an enhanced b-quark Yukawa coupling via p…

High Energy Physics - Phenomenology · Physics 2008-11-26 J. L. Diaz-Cruz , H. -J. He , Tim Tait , C. -P. Yuan

We investigate squark and gluino pair production at LHC(CMS) for the case of nonuniversal gaugino masses. Visibility of signal by an excess over SM background in $(n \geq 2)jets + E^{miss}_T + (m \geq leptons)$ events depends rather…

High Energy Physics - Phenomenology · Physics 2007-05-23 S. I. Bityukov , N. V. Krasnikov

We investigate the production of a heavy charged Higgs boson at hadron colliders within the context of the MSSM. A detailed study is performed for all important production modes and basic background processes for the t\bar{t}b\bar{b}…

High Energy Physics - Phenomenology · Physics 2009-11-07 Alexander Belyaev , David Garcia , Jaume Guasch , Joan Sola

We present a case study for the synergy of combined LHC and LC analyses in Susy searches where simultaneous running of both machines is very important. In case that only light non-coloured Susy particles are accessible at a Linear Collider…

High Energy Physics - Phenomenology · Physics 2007-05-23 Gudrid Moortgat-Pick

A canonical signature of the Minimal Supersymmetric Standard Model (MSSM) is the presence of a neutral Higgs boson with mass bounded from above by about 135 GeV and Standard Model (SM)-like couplings to the electroweak gauge bosons. In this…

High Energy Physics - Phenomenology · Physics 2011-03-22 Marcela Carena , Patrick Draper , Sven Heinemeyer , Tao Liu , Carlos E. M. Wagner , Georg Weiglein

Searches for supersymmetry (SUSY) are performed using a sample of hadronic events produced in 8 TeV pp collisions at the CERN LHC. The searches are based on the MT2 variable, which is a measure of the transverse momentum imbalance in an…

High Energy Physics - Experiment · Physics 2015-05-20 CMS Collaboration

The magic couple of SUSY and GUT still appears the most elegant and predictive physics concept beyond the Standard Model. Since up to now LHC found no evidence for supersymmetric particles it becomes of particular relevance to determine an…

High Energy Physics - Phenomenology · Physics 2015-09-30 Zurab Berezhiani , Marco Chianese , Gennaro Miele , Stefano Morisi

We begin an exploration of the physics associated with the general CP-conserving MSSM with Minimal Flavor Violation, the pMSSM. The 19 soft SUSY breaking parameters in this scenario are chosen so as to satisfy all existing experimental and…

High Energy Physics - Phenomenology · Physics 2010-04-23 C. F. Berger , J. S. Gainer , J. L. Hewett , T. G. Rizzo

The LHC, with its seven-fold increase in energy over the Tevatron, is capable of probing regions of SUSY parameter space exhibiting qualitatively new collider phenomenology. Here we investigate one such region in which first generation…

High Energy Physics - Phenomenology · Physics 2015-03-18 JiJi Fan , David Krohn , Pablo Mosteiro , Arun M. Thalapillil , Lian-Tao Wang

We consider a scenario where supersymmetry (SUSY) is broken at a relatively low scale by modular fields of extra compact spacelike dimensions. The effect of both soft and hard SUSY breaking terms on the mass of the lightest neutral Higgs…

High Energy Physics - Phenomenology · Physics 2011-03-21 Satyanarayan Mukhopadhyay , Biswarup Mukhopadhyaya , Soumitra SenGupta

The recent LHC discovery of a Higgs-like boson at 126 GeV has important consequences for SUSY, pushing the spectrum of strong-interacting supersymmetric particles to high energies, very difficult to probe at the LHC. This gives extra…

High Energy Physics - Phenomenology · Physics 2015-06-12 Maria Eugenia Cabrera , J. Alberto Casas , Bryan Zaldivar

High precision soft hadron abundance data produced in relativistic nuclear collisions at LHC at $\sqrt{s_{\rm NN}}\le 5500$ GeV will become available beginning in 2007/8. We explore, within the statistical hadronization model, how these…

High Energy Physics - Phenomenology · Physics 2009-01-07 Johann Rafelski , Jean Letessier