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31.
Naba K. Mondal Saurabh D. Rindani Kaustubh Agashe Pankaj Agrawal B. Ananthanarayan Ketevi Assamagan Alfred Bartl Subhendu Chakrabarti Utpal Chattopadhyay Debajyoti Choudhury Eung-Jin Chun Prasanta K. Das Siba P. Das Amitava Datta Sukanta Dutta Jeff Forshaw Thomas Gajdosik Dilip K. Ghosh Rohini M. Godbole Monoranjan Guchait Partha Konar Sabine Kraml Manas Maity Kajari Mazumdar Naba K. Mondai Biswarup Mukhopadhyaya Meenakshi Narain Santosh K. Rai Sreerup Raychaudhuri Saurabh D. Rindani D. P. Roy Seema Sharma Ritesh K. Singh Rishikesh Vaidya 《Pramana》2004,63(6):1331-1353
This is a summary of the projects undertaken by the working group I on high energy and collider physics. 相似文献
32.
S. Dutta R. Gandhi B. Mukhopadhyaya 《The European Physical Journal C - Particles and Fields》2000,18(2):405-416
We study the possibilities offered by muon storage rings for appearance experiments in order to determine masses and mixing angles for the and oscillations. The dependence of tau event rates on baseline, forward peaking of decay neutrinos with increasing energies,
and average fluxes intercepted by detectors of various sizes is discussed. It is found that the baseline length does not significantly affect the rates for oscillations of such magnitudes as are suggested by the current atmospheric neutrino data.
Subsequently, the effects of cuts on hadronic and wrong sign leptonic modes are computed and used to plot 90% CL contours
for the parameter regions that can be explored in such experiments. The results show that even for modest muon beam energies,
convincing coverage and verification of the Super Kamiokande parameters is possible. In addition, a very significant enlargement
of present day bounds on the mixing parameters for neutrino oscillations of all types is guaranteed by these types of searches.
Received: 4 April 2000 / Revised version: 22 July 2000 / Published online: 8 December 2000 相似文献
33.
Biswarup Mukhopadhyaya 《Pramana》2000,54(1):147-154
Motivated by the recent super-Kamiokande results on atmospheric neutrinos, we incorporate massive neutrinos, with large angle
oscillation between the second and third generations, in a theory with R-parity violating supersymmetry. The general features of such a theory are briefly reviewed. We emphasize its testability
through the observation of comparable numbers of muons and taus, produced together with the W-boson, in decays of the lightest neutralino. A distinctly measurable decay gap is another remarkable feature of such a scenario. 相似文献
34.
Amitava Datta K. Sridhar K. Abe K. Agashe R. Aleksan B. C. Allanach S. Chakraborti D. Choudhury Asesh Krishna Datta Anindya Datta D. Ghosh R. M. Godbole M. Guchait K. Huitu P. Konar A. Kundu S. Moretti B. Mukhopadhyaya S. Moretti D. P. Roy 《Pramana》2003,60(2):383-394
The activities of the working group including some of the seminars are summarized. The written reports received are included. 相似文献
35.
A search for the enol structures of several amides YY'CHCONHPh with Y,Y' = electron-withdrawing groups (EWGs) was conducted. When Y = CN, Y' = CO(2)Me the solid structure is that of the enol (8b) MeO(2)CC(CN)=C(OH)NHPh, whereas in solution the NMR spectrum indicate the presence of both the amide MeO(2)CCH(CN)CONHPh (8a) and 8b. When Y = NO(2), Y' = CO(2)Et the main compound in CDCl(3) is the amide, but <10% of enol(s), presumably EtO(2)CC(NO(2))=C(OH)NHPh (9b), are also present. When Y = COEt, Y' = CO(2)Me or Y = COMe, Y' = CO(2)Et (10 and 11) enolization in solution and of 11 also in the solid state occurs at the carbonyl rather than at the ester site. With Y = Y' = CN a rapid exchange between the amide (NC)(2)CHCONHPh (12a) and a tautomer, presumably the enol, take place in several solvents on the NMR time scale. With YY' = barbituric acid moiety the species in DMSO-d(6) is an enol of an amide although which CONH group enolizes is unknown. B3LYP/6-31G calculations showed that the enol (NC)(2)C=C(OH)NH(2) (13b) is more stable by DeltaG of 0.4 kcal/mol than (NC)(2)CHCONH(2) (13a) due to a combination of stabilization of 13b and destabilization of 13a and both are much more stable than the hydroxyimine and ketene imine tautomers. The effect of Y,Y' and the solvent on the relative stabilization of enols of amides is discussed. 相似文献
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We explore the signals of a charged Higgs arising in a two Higgs doublet model respecting SUL(2)×U(1)×Z2 symmetry with three singlet right-handed neutrinos, NR. The charged Higgs in this model has negligible coupling with quarks, and has unsuppressed coupling to leptons and neutrinos. This leads to novel signatures of the charged Higgs at the LHC, especially in the case of an inverted neutrino mass hierarchy, in the form of electrons and muons with missing energy. 相似文献
39.
Sonay Yanar Ata Sevim B. Boyacioglu Mesude Saglam Soma Mukhopadhyaya Ashok Chatterjee 《Superlattices and Microstructures》2008
The problem of an electron interacting with longitudinal-optical (LO) phonons is investigated in an N-dimensional quantum dot with symmetric Gaussian confinement in all directions using the Rayleigh–Schrödinger perturbation theory, a variant of the canonical transformation method of Lee–Low–Pines, and the sophisticated apparatus of the Feynman–Haken path-integral technique for the entire range of the coupling parameters and the results for N=2 and N=3 are obtained as special cases. It is shown that the polaronic effects are quite significant for small dots with deep confining potential well and the parabolic potential is only a poor approximation of the Gaussian confinement. The Feynman–Haken path-integral technique in general gives a good upper bound to the ground state energy for all values of the system parameters and therefore is used as a benchmark for comparison between different methods. It is shown that the perturbation theory yields for the ground state polaron self-energy a simple closed-form analytic expression containing only Gamma functions and in the weak-coupling regime it provides the lowest energy because of an efficient partitioning of the Gaussian potential and the subsequent use of a mean-field kind of treatment. The polarization potential, the polaron radius and the number of virtual phonons in the polaron cloud are obtained using the Lee–Low–Pines–Huybrechts method and their variations with respect to different parameters of the system are discussed. 相似文献
40.
B. Mukhopadhyaya S. Raychudhuri K. Agashe B. Allanach D. Bailin B. Brahmachari U. Chattopadhyay D. Choudhury P. Das Amitava Datta Anindya Datta A. Djouadi A. Giri K. Huitu A. Kundu U. Mahanta S. Moretti B. Mukhopadhyaya J. C. Pati A. K. Ray A. Raychaudhuri S. Raychaudhuri P. Roy N. Singh R. Vaidya 《Pramana》2003,60(2):395-399