Biswarup Mukhopadhyaya

Research Summary: A detailed study of doubly charged scalars, such as those that can render neutrinos massive, has been carried out in the context of the LHC. Hitherto unexplored production mechanisms as well as novel detection channels have been suggested (with T. Han, Z. Si, K. Wang). An elaborate investigation has been carried out on the effects of gaugino non- universality in supersymmetry (SUSY) and its impact on multichannel analyses at the LHC. Possible ways of distinguishing among various grand unified theories have been suggested (with Subhaditya Bhattacharya and Asesh K. Datta ). Some new signals have been suggested for a light Higgs boson in a CP-violating SUSY scenario. ways of getting over various contaminating agents for these signals have been suggested (with Priyotosh Bandyopadhyay, Amitava Datta and Asesh K. Datta).. Some ways of distinguishing SUSY theories from Little Higgs scenarios with T- parity at the LHC have been suggested. It is shown in particular that trilepton events can be useful in this respect (with Asesh K. Datta, Paramita Dey, Sudhir K. Gupta and Andreas Nyffeler). New features of theories with SU(2) triplet Higgs have been explored. In particular, it has been pointed out that the minimal version of such theories used in explaining neutrino masses have an inconsistency about them, which can be overcome only by augmenting the Lagrangian with terms that can alter observed phenomena substantially. A study of bulk tensor fields of rank higher than two has been carried in the context of a Randall-Sundrum model. It has been shown that such higher rank fields, which can arise as modes of excitation of an open string, have progres- sively smaller coupling to matter fields in the 3-brane comprising the visible world, thus explaining why gravity plays the key role in the evolution of the universe (with Somasri Sen and Soumita SenGupta)..

Publications:

1. Tao Han, Biswarup Mukhopadhyaya, Zongguo Si and Kai Wang, Pair production of doubly-charged scalars: Neutrino mass constraints and signals at the LHC, Phys. Rev. D76, 075013 (2007)

2. Rathin Adhikari, Anindya Datta, Biswarup Mukhopadhya, The Neutrino

1 mass scale and the mixing angle theta(13) for quasi-degenerate Majorana neutrinos, Phys. Rev. D76,073003 (2007)

3. Subhaditya Bhattacharya, AseshKrishna Datta, Biswarup Mukhopadhya, Non-universal gaugino masses: A Signal-based analysis for the Large Hadron Col- lider, JHEP 0710, 080 (2007)

4. AseshKrishna Datta, Paramita Dey, Sudhir Kumar Gupta, Biswarup Mukhopad- hyaya, Andreas Nyffeler, Distinguishing the Littlest Higgs model with T-parity from supersymmetry at the LHC using trileptons,, Phys. Lett. B659, 308 (2008)

5. Biswarup Mukhopadhyaya, Somasri Sen, Soumitra SenGupta, Bulk antisym- metric tensor ﬁelds in a Randall-Sundrum model, Phys. Rev. D76, 121501 (2007)

Preprints:

1. Priyotosh Bandyopadhyay, Amitava Datta, Aseshkrishna Datta, Biswarup Mukhopadhya, Associated Higgs production in CP-violating supersymmetry: Probing the ‘open hole’ at the large hadron collider, arXiv:0710.3016 [hep-ph]

2. Paramita Dey, Anirban Kundu, Biswarup Mukhopadhyaya, Some consequences of a Higgs triplet, arXiv:0802.2510 [hep-ph]

Conference/Workshops Attended:

1. Pheno-2008, University of Wisconsin, Madison, USA, May, 2007.

2. Preparing for the LHC, KITP, University of California, Santa Barbara, USA, February-March, 2008.

3. Higgs Hunters’ Meeting, Visva-Bharati, Santiniketan, February, 2008.

4. Nu-Horizon, Harish-Chandra Research Institute, February, 2008.

Visits to other Institutes:

1. University of Wisconsin, Maddison, USA, April-May, 2007.

2. Fermi National Accelerator Laboratory, USA, May, 2007.

3. University of California, Santa Barbara, USA, February-March, 2007.

4. University of Calcutta, December, 2007.

2 5. Indian Association for the Cultivation of Science, Kolkata, August, 2007.

Invited Lectures/Seminars:

1. Right-handed neutrinos in a supersymmetric world, Pheno-08, University of Wisconsin, Madison, May, 2007.

2. Dogs that do not bark- supersymmetry and right-handed neutrinos, University of Wisconsin, Madison, May, 2007.

3. Dogs that do not bark- supersymmetry and right-handed neutrinos, Fermilab The- ory Seminar, Fermilab, May, 2007.

4. Some consequence of right-handed neutrinos, Shyamal Sengupta Memorial Lec- ture, Indian Association for the Cultivation of Science, Kolkata, August, 2007.

5. The LHC and elementary particles, Refresher programme for college teach- ers, University of Calcutta, September, 2007.

6. Particle physics and the standard model (12 lectures), SERC Preparatory School, Banaras Hindu University, December, 2007.

7. The LHC experiment, One-day seminar on high energy physics, University of Calcutta, February, 2008.

8. Neutrinos and the LHC, Nu-Horizon, HRI, February, 2008.

Other Activities:

1. Acted as co-ordinator, Regional Centre for Accelerator-based Particle Physics, Harish-Chandra Research Institute.

2. Currently Dean (academic), Harish-Chandra Research Institute.