Namit Mahajan

Research Summary:

As we enter the precision era in particle physics, with more and more experiments yielding new and accurate results and improving upon the the older ones, the need to look more closely into the basic theory governing particle interactions can no longer be ignored or postponed. The main focus of my research work during the last one year has been to study two photon decay modes of B-mesons, an area that has become a very fertile and imprtant one to test and enhance our understanding of particle interactions. The two photon modes are expected to be observed in near future and therefore need to be precisely evaluated. Continuing with the previous work in this direction, along with my collaborators, two more decay modes were explored [3,4].

Non-commutative field theories have attracted a lot of interest and activity in the recent past. In [1], some phenomenological aspects were investigated while in [2], PCT theorem, one of the pillars of quantum field theory, was investigated in such a set up.

The unitarity violation in Littlest Higgs models was studied in preprint [1].

Publications:

• t → bW IN NONCOMMUTATIVE STANDARD MODEL, Namit Mahajan, Phys. Rev. D68, 095001,2003 [arXiv: hep-ph/0304235].

• PCT THEOREM IN FIELD THEORY ON NONCOMMUTATIVE SPACE , Namit Mahajan, Phys. Lett. B569, 85 ,2003 [arXiv: hep-th/0305105].

• CP VIOLATION IN THE DECAY MODE B → πγ&gamma. with S.R.Choudhury (Delhi U.), G.C. Joshi (Melbourne U.), Namit Mahajan and B.H.J.McKellar (Melbourne U.), Phys. Rev. D69, 054011,2004 [arXiv: hep-ph/0306293].

• SHORT AND LONG DISTANCE CONTRIBUTIONS TO B → K^*γ&gamma. with S.R.Choudhury (Delhi U.), A.S.Cornell (Korea Inst. Advanced Study, Seoul) and Namit Mahajan, Phys. Lett. B580, 177 (2004) [arXiv: hep-ph/0307104].

Preprint:

LITTLEST HIGGS MODEL AND UNITARITY CONSTRAINTS, [arXiv: hep-ph/0310098].

Conference/Workshops Attended:

• 6th ACFA meeting, T.I.F.R., Mumbai (December 2003)

• 8th WHEPP, I.I.T. Mumbai (January 2004).

Visits to other Institutes:

Department of Physics and Astrophysics, University of Delhi, Delhi.

Other Activities:

• Two lectures on "Fermat Principle and applications in daily life" under the Raj-Bhasha programme, 2003.

• Seminar on "PCT theorem and its status in Non-commutative Field Theory", August 2003.

• Journal Club talk on "Renormalization aspects in Non-anticommuting field theories", September 2003.

• Journal Club talk on "Littlest Higgs Model" in September 2003.

• Helped in the organisation of the Talent Search Exam (Physics Part) conducted by HRI in November 2003.

• An overview talk on "Nucleosynthesis", November 2003.

• Seminar on "Some two photon decay modes of B-mesons", February 2004.