Articles written in Pramana – Journal of Physics
Volume 63 Issue 6 December 2004 pp 1151-1170
We discuss applications of the perturbative QCD approach in the exclusive non-leptonic two-body
Volume 76 Issue 5 May 2011 pp 729-739
Amol Dighe Anjan Giri Rupak Dutta Naveen Gaur Tim Gershon Diptimoy Ghosh Xiao-Gang He George W-S Hou Yong-Yeon Keum Bhavik Kodrani Namit Mahajan Joaquim Matias Barilang Mawlong Basudha Misra Rukmani Mohanta Gagan Mohanty Sudhir Vempati
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.
Volume 86 Issue 2 February 2016 pp 369-377 Special: Cosmology
Recent measurements of cosmic ray proton and helium spectra show a hardening above a few hundreds of GeV. This excess is hard to understand in the framework of the conventional models of galactic cosmic ray production and propagation. Here, we propose to explain this anomaly by the presence of local sources. Cosmic ray propagation is described as a diffusion process taking place inside a two-zone magnetic halo. We calculate the proton and helium fluxes at the Earth between 50 GeV and 100 TeV. Improving over a similar analysis, we consistently derive these fluxes by taking into account both local and remote sources for which a unique injection rate is assumed. We find cosmic ray propagation parameters for which the proton and helium spectra remarkably agree with the PAMELA and CREAM measurements over four decades in energy.
Volume 86 Issue 2 February 2016 pp 437-451 Special: Neutrino Physics
We investigate the way the total mass sum of neutrinos can be constrained from the neutrinoless double beta-decay and cosmological probes with cosmic microwave background (CMBR), large-scale structures including 2dFGRS and SDSS datasets. First we discuss, in brief, the current status of neutrino mass bounds from neutrino beta decays and cosmic constraint within the flat 𝛬CMD model. In addition, we explore the interacting neutrino dark-energy model, where the evolution of neutrino masses is determined by quintessence scalar field, which is responsible for cosmic acceleration. Assuming the flatness of the Universe, the constraint we can derive from the current observation is 𝛴𝑚𝜈 < 0.87 eV at 95% confidence level, which is consistent with 𝛴𝑚𝜈 < 0.68 eV in the flat 𝛬CDM model without Lyman alpha forest data. In the presence of Lyman-𝛼 forest data, interacting dark-energy models prefer a weaker bound 𝛴𝑚𝜈 < 0.43 eV to 𝛴𝑚𝜈 < 0.17 eV (Seljark
Volume 95, 2021
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