The search for standard model double Higgs boson (hh) production at CMS is presented, using final states from various decay channels: HH->b b b b, b b VV, b b tau tau, and b b gamma gamma. The hh production serves to measure the self-coupling of the Higgs boson the rate of which is small in the SM. However, contributions from beyond standard models (BSM) can significantly enhance the rate....
Machine learning is now widely used in many fields of high energy physics. In particular, many important results have been improved in relation to the Higgs physics phenomena. Based on previous studies for Higgs-pair production in $HH \rightarrow b \bar{b} \gamma\gamma$ channel at the HL-LHC, we apply the
machine learning approaches to the study of self-coupling of Higgs particle. We show...
Augmentation of invisible information with respect to many hypothetical models of background and signal processes, can highly improve the performance of the machine learning classifiers for HEP event discrimination. In this regard di-Higgs searches in the channels with multiple invisible final states, is one of the most important applications. Focusing on the di-Higgs channels with 2 bottom...
Since the discovery of SM-like Higgs boson, new physics search has been very actively performed. It is interesting that most of the new physics predicts Higgs mechanism with extended Higgs sectors, which means the charged Higgs bosons must exist. Searches for charged Higgs bosons have been performed below and above the top quark mass, however no significant excess is reported. Here the recent...
The ILC is a linear electron-positron collider at center of mass energy of 250 GeV. It is optimized for the precision study of the Higgs boson which acts as a probe for physics beyond the standard model. Its high sensitivity may allow certain new particles to be found that are not easily detected at the LHC. The basic technologies are now ready and the Japanese government is in the final...
A massive spin-2 particle can act as the mediator between dark matter and standard model particles through the energy momentum tensor in the spin-2 mediated dark matter model. The scattering amplitudes between dark matter and standard model particles are examined by effective theory and consisted of effective operators after the mediator is integrated out. The differential event rate with...
A dark sector which contains dark matter may have its own gauge group structure. Depending on a gauge structure and corresponding charge of dark matter, collider phenomenology can be different. In this talk, I will talk about U(1) and SU(3) dark gauge group and distinctive signature at the LHC.
We consider a model of decaying axino-like particle dark matter with lifetime around the age of the universe. Its late decay to gravitino plus axion-like particle is able to solve small-scale problems. We will also show a distinct signature of the axion-like particle from the axino-like particle decay.
