Four body decay of the lighter top-squark constrained by the Lighter CP-even Higgs boson mass bound
arXiv:hep-ph/0512011 · doi:10.1103/PhysRevD.73.115004
Abstract
We reinvestigated the parameter space allowing a large BR of the 4-body decay of the lighter top-squark ($\lstop$) accessible at Tevatron Run-II by imposing the lighter CP-even Higgs boson mass ($\mlhiggs$) bound from LEP. Important constraints were obtained in mSUGRA as well as in the unconstrained supersymmetric models. Our results show that the prospect of searching the lighter top-squark via the 4-body decay mode, in particular the $\ell + n-jets + \met$ signal, is not promising in mSUGRA due to the above bound on $\mlhiggs$. The existing bounds on $\mlstop$ from Tevatron Run-I and LEP assuming 100% BR of the loop decay of $\lstop$ are, therefore, valid to a good approximation. We also find that large BRs of the above 4-body decay are allowed in the unconstrained model over significant regions of parameter spaces and the possibility that this decay mode is the main discovery channel at Tevatron Run-II is open. We have briefly reviewed the theoretical uncertainties in the calculation of $\mlhiggs$ and their consequences for the constraints obtained by us. We have commented upon, with illustrative examples, how the above parameter space is affected if future experiments push the Higgs boson mass bound upward.
arXiv comment24 pages, 14 figures, added comments in sec.1, added 2 figures and comments in sec.2.1, conclusion and references updated
References in corpus (28)
- Search for the Standard Model Higgs Boson at LEP
- FeynHiggs: a program for the calculation of the masses of the neutral CP-even Higgs bosons in the MSSM
- Towards High-Precision Predictions for the MSSM Higgs Sector
- ANALYTICAL EXPRESSIONS FOR RADIATIVELY CORRECTED HIGGS MASSES AND COUPLINGS IN THE MSSM
- Effective potential methods and the Higgs mass spectrum in the MSSM
- Higgs Boson Theory and Phenomenology
- SDECAY: a Fortran code for the decays of the supersymmetric particles in the MSSM
- The Lightest Higgs Boson Mass in the Minimal Supersymmetric Standard Model
- Precise determination of the neutral Higgs boson masses in the MSSM
- Strong Constraints on the Parameter Space of the MSSM from Charge and Color Breaking Minima
- Electroweak Precision Observables in the Minimal Supersymmetric Standard Model
- QCD Corrections to the Masses of the neutral CP-even Higgs Bosons in the MSSM
- CPsuperH: a Computational Tool for Higgs Phenomenology in the Minimal Supersymmetric Standard Model with Explicit CP Violation
- Precise Prediction for the Mass of the Lightest Higgs Boson in the MSSM
- High-Precision Predictions for the MSSM Higgs Sector at O(alpha_b alpha_s)
- Decays of the Lightest Top Squark
- Search for Gluinos and Scalar Quarks in Collisions at TeV using the Missing Energy plus Multijets Signature
- Search for Scalar Top and Scalar Bottom Quarks in collisions at TeV
- Four Body Decay of the Stop Squark at the Upgraded Tevatron
- The FCNC top-squark decay as a probe of squark mixing
- Search for Scalar Top Quark Production in p-pbar Collisions at 1.8 TeV
- Searches for Scalar Top and Scalar Bottom Quarks at LEP2
- Optimal Charge and Color Breaking conditions in the MSSM
- A Search forthe Scalar Top Quark in Collisions at 1.8 TeV
- Charge and Color Breaking conditions associated with the top quark Yukawa coupling
- Search for Pair Production of Light Scalar Top Quarks in p-pbar Collisions at sqrt{s}=1.8 TeV
- Top squark mass: current limits revisited and new limits from Tevatron Run-I
- LEP Data and the Stability of the Potential Confront the mSUGRA Model