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| Description | HE Seminar Michel Herquet Speaker:Michel Herquet Host:J. Gunion Title: Twisted Higgs phenomenology at hadron colliders" Abstract: In the Standard Model for electroweak interactions, the Higgs sector is known to display a custodial symmetry protecting the mass relation mW+- = mW3 from large corrections. When considering extensions of the scalar sector, like the two-Higgs-doublet model, one could introducethis global symmetryby hand in order to pass current electroweak precision tests in a natural way. Assuming the invariance of the potential under CP transformations, the existence of a second custodial scenario characterized by mH+- =~ mH0 instead of mH+- =~ mA0 can be proved [1]. The phenomenology associated with such a model is potentially interesting. For example, a light pseudoscalar (mA0 =~ 30 GeV) together with an heavy SM-like Higgs boson (mh0 =~ 300 GeV) could perfectly survive all direct and indirect constraints. Such a scenario could lead to unexpected signatures at hadron colliders, like an unusual top decay t>W+bbb via the charged Higgs decay H+>W+A0, scalar decays of the SM-like Higgs h0>A0A0,H+H,H0H0characterized,for example, by the exotic ZZbbbb final state(gg>h0>H0H0>ZA0ZA0> ZZbbbb), ... In this talk I will expose the definition of a twisted custodialsymmetry in a 2HDM and then review the phenomenology of this model. After summarizing alldirect and indirect constraints, I will detail the possible collidersignatures at Tevatron and LHCand some preliminary results [2] obtained using MadGraph v4 and the generic 2HDM implementation[3]. [1]J. M. Grard, M. Herquet,Phys. Rev. Lett. 98 : 251802 (2007) [2] S. de Visscher, J. M. Grard, M. Herquet, V. Lematre, and F. Maltoni (2007), in preparation [3]Johan Alwall, Pavel Demin, Simon de Visscher, Rikkert Frederix, Michel Herquet, Fabio Maltoni, Tilman Plehn, David L. Rainwater, and Tim Stelzer,JHEP 09 : 028 (2007) |
| Date | Tue, October 2, 2007 |
| Time | 9:10am-10:10am PDT |
| Duration | 1 hour |
| Access | Public |
| Created by | High-Energy Seminars |
| Updated | Wed, September 26, 2007 5:07am PDT |
| Send Reminder | Yes - 1 day 8 hour 0 minutes before start |
