Nuclear and Particle Physics, Astrophysics and Cosmology, T-2

Jet probes of new physics at RHIC and at the LHC

Ivan Vitev and Grigory Ovanesyan

We review the progress on the ER project titled “Jet probes of new physics at RHIC and at the LHC”. The overarching goal of this project is to develop modern theoretical and computational tools to identify and characterize new physics at the Relativistic Heavy Ion Collider (RHIC) and at the Large Hadron Collider (LHC). We have focused on advancing the theory of jets - collimated showers of energetic subatomic particles that are abundantly produced at these facilities. With heavy ion collision in mind, we formulated an effective theory of jet interactions in matter - Soft Collinear Effective Theory with Glauber Gluons. We used this SCETG to prove the factorization and gauge invariance of medium-induced radiative corrections and provided a derivation of the medium-induced splitting kernels beyond the soft gluon approximation. In phenomenological applications we combine next-to-leading order inclusive and tagged jet cross sections with the effects for the nuclear medium to provide first predictions for the modification of the inclusive and tagged jet cross sections and shapes at RHIC and the LHC. In the second part of this talk we focus on Higgs boson physics at the LHC. Since the CMS and ATLAS discovery of a new boson with mass around 125 GeV in the ZZ, di-photon and WW channels, it has been one of the top priorities of LHC to establish whether or not this particle is indeed the Higgs boson. For this purpose, many other Higgs decay channels must be explored. We describe the significance of discovering the Higgs boson at LHC in the b b-bar channel, using jet substructure to reduce the standard model backgrounds. We give a brief overview on the recent jet techniques for such analysis and present our preliminary results on the required luminosity for finding the Higgs boson in this channel.

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