Planck 2018&nbsp;<br /> <h2>From the Planck Scale to the Electroweak Scale</h2>

Session

Parallel Session on EW Vacuum Stability

24 May 2018, 16:10

Bonn

133. Decay Rate of Electroweak Vacuum in the Standard Model and Beyond

So Chigusa

24/05/2018, 16:10

We perform a precise calculation of the decay rate of the electroweak vacuum in the standard model as well as in models beyond the standard model. We use a recently developed technique to calculate the decay rate of a false vacuum, which provides a gauge invariant calculation of the decay rate at the one-loop level. We give a prescription to take into account the zero modes in association with...

134. Constraining BSM Scalar Sectors through Vacuum Stability

Mr Jonas Wittbrodt (DESY)

24/05/2018, 16:30

Since the LHC has not provided us with any hints towards new physics, it is ever more interesting to constrain BSM theories from purely theoretical considerations. Requiring that the electroweak vacuum in any BSM model is at least metastable, can lead to stringent constraints on the parameter space of the model. Many popular extensions of the SM, such as supersymmetry, feature greatly extended...

135. RG improvement of multi-field potentials

Bogumila Swiezewska

24/05/2018, 16:50

In this talk a new method or renormalisation-group (RG) improvement of effective potentials in models with extended scalar sector is presented. With the use of this method, the RG improved potential can be expressed as the tree-level potential evaluated at a suitably chosen field-dependent scale. This follows from solving the RG equation for the effective potential with a suitably chosen...

136. Electroweak vacuum stability from extended Higgs portal dark matter and type-I seesaw

Dr ARUNANSU SIL (IIT Guwahati)

24/05/2018, 17:10

We investigate the electroweak vacuum stability in presence of a scalar dark matter and neutrino mass model through type-I seesaw. The minimal Higgs portal dark matter framework is extended here with another scalar singlet field carrying non-zero vacuum expectation value. Our results reveal that inclusion of this extra scalar not only helps in achieving absolute vacuum stability (even with...