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TeV Scale Leptogenesis, theta_13 And Doubly Charged Particles At LHC.pdf

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TeV Scale Leptogenesis, theta_13 And Doubly Charged Particles At LHC

a r X i v : h e p - p h / 0 5 0 8 0 3 7 v 2 2 J a n 2 0 0 6 BA-05-05 TeV Scale Leptogenesis, θ13 And Doubly Charged Particles At LHC Shahida Dar, Qaisar Shafi, and Arunansu Sil Bartol Research Institute, Department of Physics and Astronomy, University of Delaware, Newark, DE 19716, USA Abstract We explore a realistic supersymmetric SU(2)L×SU(2)R×U(1)B?L model spontaneously broken at around 1012 GeV. The presence of D and F -flat directions gives rise to TeV mass doubly charged particles which can be found at the LHC. We implement TeV scale leptogenesis and employing both type I and II seesaw, the three light neutrinos are partially degenerate with masses in the 0.02? 0.1 eV range. The effective mass parameter for neutrinoless double beta decay is 0.03? 0.05 eV. We also find the interesting relation tan 2θ13 ? sin 2θ12tan 2θ23 ( ?m2 ⊙ ?m2atm ) . 0.02. 1 It has been recognized for some time that spontaneously broken supersymmetric models with D and F -flat directions can lead to interesting phenomenological and cosmological consequences [1, 2, 3, 4, 5, 6, 7]. An intermediate symmetry breaking scale of order 108?1016 GeV is a characteristic feature of these models. Another important aspect is the appearance of thermal inflation typically involving about 10 or so e-foldings [2, 4, 6, 7]. The entropy generation associated with thermal inflation has been exploited to try to resolve the gravitino [2] and moduli problem [8], and to suppress the primordial monopole number density to acceptable levels [5]. The entropy production does have an important drawback though. It will dilute , and in some cases completely wash away, any pre- existing baryon asymmetry. This very depends on the magnitude of the intermediate scale MI [6]. In [9], with an intermediate scale of order 108 GeV, the observed baryon asymmetry was explained via resonant leptogenesis [10]. The relatively low intermediate scale causes a moderate amount of dilution of an initially large lepton asymmetry, such