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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 (Arkani-Hamed, Dimopoulos and Dvali) and RS (Randall-Sundrum) 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 e+e- linear collider. We are presently investigating some more possibilities to identify RS type graviton and their decay.
Recently, we showed [Publications 1] that charged slepton pairs
produced via vector-boson fusion along with two high-mass, high-pT
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.
From the feedback of our previous result, we investigated whether stau
pairs produced via vector-boson fusion can be effective to discover
Supersymmetric scenarios with inverted mass hierarchy [preprint 1],
which is difficult to observe at a hadron collider. This turns out to
be an interesting channel to study both in a model-independent way and
with reference to some specific, well-motivated models. The mass reach
at LHC are expected to be substantially hiked in this manner.
We studied [Publications 2] the process e+e- → e+e- + missing energy at a high-energy e+e- 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 e+e- → &gamma + 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.
Publications:
- Slepton production from gauge boson fusion.
with Debajyoti Choudhury, Anindya Datta, Katri Huitu, Stefano Moretti,
Biswarup Mukhopadhyaya.
e-Print Archive: hep-ph/0304192
Published in Phys.Rev. D68:075007, 2003
- Bhabha Scattering with Radiated Gravitons at Linear Colliders.
with Sukanta Dutta, Biswarup Mukhopadhyaya, Sreerup Raychaudhuri.
e-Print Archive: hep-ph/0307117
Published in Phys.Rev. D68:095005, 2003
Preprints:
- Gauge boson fusion as a probe of inverted hierarchies in
supersymmetry.
with Biswarup Mukhopadhyaya.
e-Print Archive: hep-ph/0311347
Conference/Workshops Attended:
- Workshop on High Energy Physics Phenomenology, (WHEPP-8)
during 5 -16 January, 2004 at Indian Institute of Technology, Mumbai.
- 6th ACFA-LC workshop during 15-17 December, 2003 at TIFR, Mumbai.
- 57th Scottish Universities Summer School in Physics on LHC
Phenomenology during 17-29 August 2003 at St. Andrews, Scotland.
Visits to other Institutes:
- Visited Department of High Energy Physics, TIFR, Mumbai
during 18th Dec. to 4th Jan. 2004.
- Visited School of Physics and Astronomy, University of Southampton, England during 29th Aug. to 5th sept. 2003.
Invited Lectures/Seminars:
- ` Search for Supersymmetry through Vector Boson Fusion` a 'Free Meson seminar' on Feb. 2004 at TIFR, Mumbai.
- ` Associated Graviton production in Bhabha Scattering at Linear Colliders` Dec. 2003 at 6th ACFA-LC workshop at TIFR, Mumbai.
- ` Signals of Supersymmetry in Vector Boson Fusion` Sep. 2003 at the Department of Physics and Astronomy, University of Southampton, Southampton, England.
Other Activities:
Seminar 'Supersymmetric signals in Vector Boson Fusion' March 23, 2004 at HRI.
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