Drafts by Amitava Raychaudhuri
We explore the consequences of promoting bilinear R-parity violation, usually formulated in the m... more We explore the consequences of promoting bilinear R-parity violation, usually formulated in the minimal supersymmetric standard model framework, to a supersymmetric SU(5) grand unified theory. We observe that the limits on proton decay and neutrino mass place tight constraints on the bilinear SU(5) R-parity violating interactions of the colour triplet and SU(2) L doublet types respectively, creating a different doublet-triplet issue. The new mass-term-type parameters are both required to be small compared to the their expected order – the GUT scale. This cannot be resolved by an extension of the usual fine-tuning in the symmetry breaking scalar sector, which keeps the doublet sector light at the cost of pushing the triplet to the GUT-scale, and is an obstacle for R-parity violation in SU(5).
Papers by Amitava Raychaudhuri
Physical review, Dec 15, 1978
Journal of High Energy Physics, 2018
Physical review, Dec 27, 2016
Modern Physics Letters A, Oct 20, 1991
We have studied the bounds on mixing angles of fermions with their exotic partners which may stem... more We have studied the bounds on mixing angles of fermions with their exotic partners which may stem from different possibilities of new physics. The tree level effects of mixing have been taken care of by a modification of the effective vector and axial-vector couplings of Z to the fermions. The radiative corrections arising from new physics of exotic fermions are assumed to be negligible; as a result the ρ parameter and the effective sin 2 θw are calculated within the framework of the Standard Model. Mixing angles have been treated as free parameters during simultaneous fits to the combined data of cross-sections and lepton asymmetries from the four LEP experiments which have collected over 550,000 Z0 decays in 1990. Fitted values of mixing angles and the upper bounds at 90% C. L. are discussed.
Physics Letters B, Apr 1, 2011
Second in a series of international workshops in high energy physics, WHEPP II deals with frontli... more Second in a series of international workshops in high energy physics, WHEPP II deals with frontline areas of particle phenomenolgy with an eye to new physics with planned accelerators. Among the topics discussed are collider physics and structure function; B physics, hadronic matrix elements and lattice results; new particle search and model building, LEP results and radiative corrections to electro-weak processes; and baryon number violation in electro-weak processes.
Journal of Physics G, Jun 1, 1994
... Comments on 'Virtual effects of squark-gluino coupling on Z decays into bb'... more ... Comments on 'Virtual effects of squark-gluino coupling on Z decays into bb' Gautam Bhattacharyya and Amitava Raychaudhuri Department of Pure Physics, University of Calcutta, 92 Acharya Prafulla Chandra Road, Calcutta 700 009, India Received 18 October 1993 Abstract. ...
Nuclear physics, Jun 1, 2014
Physical review, Jul 19, 2000
Physical review, Mar 1, 1998
Second in a series of international workshops in high energy physics, WHEPP II deals with frontli... more Second in a series of international workshops in high energy physics, WHEPP II deals with frontline areas of particle phenomenolgy with an eye to new physics with planned accelerators. Among the topics discussed are collider physics and structure function; B physics, hadronic matrix elements and lattice results; new particle search and model building, LEP results and radiative corrections to electro-weak processes; and baryon number violation in electro-weak processes.
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Drafts by Amitava Raychaudhuri
Papers by Amitava Raychaudhuri