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- Namit Mahajan
- 2001

We study Î³Î³ scattering in noncommutative QED (NCQED) where the gauge field has Yang-Mills type coupling, giving new contributions to the scattering process and making it possible for it to occur at tree level. The process takes place at one loop level in the Standard Model (SM) and could be an important signal for physics beyond SM. But it is found that theâ€¦ (More)

- Namit Mahajan
- 2003

The PCT theorem is shown to be valid in quantum field theory formulated on noncommutative spacetime by exploiting the properties of the Wightman functions defined in such a set up. Quantum field theory provides the general basis and correct theoretical framework known till date to describe particle properties and interactions and the PCT theorem enjoys aâ€¦ (More)

- Namit Mahajan
- 2003

We study the top quark decay to b quark and W boson in the NonCommutative Standard Model (NCSM). The lowest contribution to the decay comes from the terms quadratic in the matrix describing the noncommutative (NC) effects while the linear term is seen to identically vanish because of symmetry. The NC effects are found to be significant only for low valuesâ€¦ (More)

- Namit Mahajan
- 2005

We take a closer look at the recently discussed models of hadrons based on holographic ideas and chiral symmetry breaking in five dimensions. We study the two point correlator in detail and look at the field theoretic properties needed to be satisfied by the correlator. It is shown that the spectral density becomes negative, violating the basic requirementsâ€¦ (More)

If the neutrinos are to be identified with the primary source of ultra-high energy cosmic rays(UHECR), their interaction on relic neutrinos is of great importance in understanding their long intergalactic journey. In theories with large compact dimensions, the exchange of a tower of massive spin-2 gravitons (Kaluza-Klein excitations) gives extraâ€¦ (More)

- Chandan Hati, Gopalakrishnan Kumar, Namit Mahajan
- 2015

Recent experimental results from the LHCb, BaBar and Belle collaborations on the semitauonic decays of B meson, BÌ„ â†’ D(âˆ—)Ï„ Î½Ì„, showing a significant deviation from the Standard Model (SM), hint towards a new physics scenario beyond the SM. In this work, we show that these enhanced decay rates can be explained within the framework of E6 motivated Alternativeâ€¦ (More)

- Namit Mahajan
- 2002

We study polarized cross-sections and forward-backward asymmetry for the process e+eâˆ’ â†’ Ï„+Ï„âˆ’ in the stabilized Randall-Sundrum scenario. It is shown that there is substantial deviation from the Standard Model predictions, both in terms of the actual numerical values and angular distributions. The hierarchy between the electroweak and the Planck scaleâ€¦ (More)

- Y. - Y. Keum, BHAVIK KODRAN, +6 authors Amol S. Dighe
- 2011

We present the report of the B physics working group of the Workshop on High Energy Physics Phenomenology (WHEPP-XI), held at the Physical Research Laboratory, Ahmedabad, in January 2010.

We study the neutral current flavour changing rare decay mode B â†’ KÎ³Î³ within the framework of Standard Model, including the long distance contributions. It is found that these long distance contributions can be of the same order as the short distance contribution.

A new mechanism is proposed for generating neutrino masses radiatively through a non-minimal coupling to gravity of fermionic bilinears involving massive neutral fermions. Such coupling terms can arise in theories where the gravity sector is augmented by a scalar field. They necessarily violate the principle of equivalence, but such violations are not ruledâ€¦ (More)