Theory challenges for LHC physics

Session

Student talks

20 Jul 2015, 16:20

Joint Institute for Nuclear Research, Bogoliubov Laboratory of Theoretical Physics

14. Constraints on Seesaw Models and Signatures at the LHC

Subrata Khan (IISER Kolkata)

20/07/2015, 16:20

We consider variants of TeV-scale seesaw models in which two and three additional heavy right-handed neutrinos are added to the standard model to generate the hierarchical and quasidegenerate light neutrinos respectively. These models are theoretically interesting since they can be fully reconstructed from the neutrino oscillation data except for an unknown constant in the Dirac-Yukawa...

71. Neutralino Dark Matter and Other LHC Predictions from Quasi Yukawa Unification

Mr Sukru Hanif Tanyildizi (JINR)

20/07/2015, 16:40

We explore the dark matter and LHC implications of t-b-tau quasi Yukawa unification in the framework of supersymmetric models based on the gauge symmetry G=$SU(4)_{c}\times SU(2)_{L}\times SU(2)_{R}$. The deviation from exact Yukawa unification is quantified by a dimensionless parameter C (|C| <~ 0.2), such that the Yukawa couplings at M_GUT are related by y_t:y_b:y_tau=|1+C| : |1-C| : |1+3C|....

63. New Physics signals in Vector quark models

Mr DINESH KUMAR (IIT BOMBAY)

20/07/2015, 17:00

We investigate the vector quark models which include the addition of a vector isosinglet quark to the Standard Model. In these models, the full CKM matrix is larger than 3 × 3. A signal of the new physics will be the non-unitarity of the 3 × 3 CKM matrix. Using present flavor physics data, we perform a combined fit to this full CKM matrix, looking for signals of new physics (NP). We find...

69. The Nielsen Identities - a useful tool for showing gauge invariance

Ms Anne Ernst (University of Hamburg, II. Theoretical Institute)

22/07/2015, 16:20

Nielsen Identities are a generalisation of the Slavnov-Taylor identities which show the gauge parameter dependence of 1-PI diagrams. They are derived from a generalised BRST-invariance of the Lagrangian, in which the gauge parameter gets promoted to a scalar field. I will derive fermionic Nielsen Identities for generating functionals and proper vertex functions, and show how to use them both...

9. Mass bounds in 2HDMs in the SM-like limit.

Ms Ambalika Biswas (S N Bose National Centre for Basic Sciences, Kolkata, India)

22/07/2015, 16:40

We consider 2HDMs with a softly broken global U(1) symmetry and the fermion transformations under this symmetry. We study the implication of a criterion of naturalness for a broad class of two Higgs doublet models (2HDMs). In particular, we assume the cancellation of quadratic divergences in what are called the type I, type II, lepton-specific and flipped 2HDMs. This results in a set of...

54. Some aspects of the NMSSM Higgs sector at the LHC

Mr Jacky Kumar (TIFR, Mumbai)

22/07/2015, 17:00

In the framework of non-minimal extension of SUSY model, the NMSSM is one of the interesting frameworks which can accommodate the recently discovered Higgs mass. In this model the Higgs sector is very diverse. We study the Higgs phenomenology in this model framework and its implications for future LHC experiments. In this talk I shall discuss some aspects of our...

87. Two-particle disintegration processes in covariant approach

Mr Philip Kuznietsov (Institute of Electrophysics and Radiation Technologies NAS of Ukraine)

22/07/2015, 17:20

We provide a method to construct covariant two-particle nonlocal matter field disintegration amplitude. One is a sum of traditional pole series and the regular part. We explore the deposits of regular part of amplitude, and its physical sense. In the amplitudes regular part achieved absence of the singularity when fragments are scattered at right angle.We use covariant approach with conserved...