Partha Konar

Research Summary:

During the period of last one year my research work have been focused mainly on two issues of looking for signals of physics beyond the standard model of particle physics. In the context of supersymmetry searches, we have continued further investigations, where the relevance of vector boson fusion (VBF) mechanism have been pointed out at hadronic collider. Secondly, I am also working on the ADD and RS models with Extra spatial dimensions, which has been proposed as a solution to the hierarchy problem. Some new signals of such theories were investigated in the context of a proposed high energy linear collider.

Recently, we showed [ preprint 1 ] that charged slepton pairs produced via vector-boson fusion along with two high-mass, high- forward/backward jets (in two opposite hemispheres) can have a higher production cross-section for heavy slepton masses than that from conventional Drell-Yan production at a hadronic collider. Thus, we concluded after a detailed simulation,it can improve the mass reach of slepton search at LHC.

We studied [ preprint 2 ] the process + missing energy at a high-energy collider, where the missing energy arises from the radiation of Kaluza-Klein gravitons in a model with large extra dimensions. It is shown that at a high-energy linear collider, this process can not only confirm the signature of such theories but can also sometimes be comparable in effectiveness to the commonly discussed channel + missing energy, especially for a large number of extra dimensions and with polarized beams. We also suggest some ways of distinguishing the signals of a graviton tower from other types of new physics signals by combining data on our suggested channel with those on the photon-graviton channel.

Preprints:

1. Slepton production from gauge boson fusion.
   with Debajyoti Choudhury, Anindya Datta, Katri Huitu, Stefano Moretti, Biswarup Mukhopadhyaya.
   hep-ph/0111083
   
2. Bhabha Scattering with Radiated Gravitons at Linear Colliders.
   with Sukanta Dutta, Biswarup Mukhopadhyaya, Sreerup Raychaudhuri.
   hep-ph/0307117
   

1. Summer School on Particle Physics during 16 June - 04 July 2003 at the Abdus Salam International Centre for Theoretical Physics, Trieste, Italy.
   
2. 3rd meeting of the Indian Linear Collider Working Group (ILCWG-III) during 8-10 May, 2003 at TIFR, Mumbai.
   
3. IXth International Symposium on Particles, Strings and Cosmology (PASCOS '03.) during 3-8 January 2003 at TIFR, Mumbai
   
4. 2nd meeting of the Indian Linear Collider Working Group (ILCWG-II) during 1-2 January, 2003 at TIFR, Mumbai.
   

1. 'Search for large extra dimensions at linear collider' May 2003 at 3rd meeting of the Indian Linear Collider Working Group at TIFR, Mumbai.
   

1. Seminar 'Graviton Signals at Linear Colliders' June 9, 2003 at HRI.
2. Was tutor for the course in Advanced Quantum Mechanics given by Biswarup Mukhopadhyaya.