B Ananthanarayan
Articles written in Pramana – Journal of Physics
Volume 51 Issue 1-2 July 1998 pp 305-311
Beyond the standard model: Working group report
Debajyoti Choudhury Saurabh D Rindani B Ananthanarayan K R S Balaji Debajyoti Choudhury Manuel Drees Shashikant Dugad Gautam Dutta Sukanta Dutta Naveen Gaur Ambar Ghosal Walter Grimus Ernest Ma Shubhendra Mohanty P N Pandita M K Parida Subhendu Rakshit Saurabh D Rindani D P Roy Probir Roy Sarira Sahu N N Singh Sudhir K Vempati Francesco Vissani
This report summarises the activities of the working group on ‘Physics beyond the Standard Model’. The results of investigations in incorporating
Volume 61 Issue 5 November 2003 pp 911-920
Review of chiral perturbation theory
A review of chiral perturbation theory and recent developments on the comparison of its predictions with experiment is presented. Some interesting topics with scope for further elaboration are touched upon.
Volume 63 Issue 6 December 2004 pp 1331-1353
Working group report: High energy and collider physics
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
This is a summary of the projects undertaken by the working group I on high energy and collider physics.
Volume 69 Issue 5 November 2007 pp 849-854 New Physics at TeV Scale and Electroweak Precision Test
At the international linear collider large beam polarization of both the electron and positron beams will enhance the signature of physics due to interactions that are beyond the standard model. Here we review our recently obtained results on a general model-independent method of determining for an arbitary one-particle inclusive state the space-time structure of such new physics through the beam polarization dependence and angular distribution of the final state particle.
Volume 79 Issue 4 October 2012 pp 891-894 Poster Presentations
Constraints on the $K_{l_{3}}$ form factors from analyticity and unitarity
Gauhar Abbas B Ananthanarayan Irinel Caprini I Sentitemsu Imsong
The $K \phi$ form factors are investigated at low energies by the method of unitarity bounds adapted so as to include information on the phase and modulus along the elastic region of the unitarity cut. Using as input the values of the form factors at $t = 0$, and at the Callan–Treiman point in the scalar case, stringent constraints are obtained on the slope and curvature parameters of the Taylor expansion at the origin.
Volume 79 Issue 5 November 2012 pp 1275-1279 Poster Presentations
B Ananthanarayan Monalisa Patra Saurabh D Rindani
The top polarization at the International Linear Collider (ILC) with transverse beam polarization is utilized in the $e^{+} e^{-} \rightarrow t\bar{t}$ process to probe interactions of the scalar and tensor type beyond the Standard Model and to disentangle their individual contributions. Confidence level limits of 90% are presented on the interactions with realistic integrated luminosity and are found to improve by an order of magnitude compared to the case when the spin of the top quark is not measured. Sensitivities of the order of a few times $10^{−3}$ TeV-2 for real and imaginary parts of both scalar and tensor couplings at $\sqrt{s} = 500$ and 800 GeV with an integrated luminosity of 500 fb-1 and completely polarized beams are shown to be possible.
Volume 79 Issue 5 November 2012 pp 1317-1320 Poster Presentations
The pion form factor from analyticity and unitarity
B Ananthanarayan Irinel Caprini I Sentitemsu Imsong
Analyticity and unitarity techniques are employed to estimate Taylor coefficients of the pion electromagnetic form factor at $t = 0$ by exploiting the recently evaluated two-pion contribution to the muon $(g − 2)$ and the phase of the pion electromagnetic form factor in the elastic region, known from $\pi \pi$ scattering by Fermi–Watson theorem and the values of the form factor at several points in the space-like region. Regions in the complex 𝑡-plane are isolated where the form factor cannot have zeros.
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