Diptimoy Ghosh
Articles written in Pramana – Journal of Physics
Volume 76 Issue 5 May 2011 pp 729-739
𝐵 Physics: WHEPP-XI working group report
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 79 Issue 4 October 2012 pp 895-898 Poster Presentations
Physics beyond the Standard Model through $b \rightarrow s\mu^{+} \mu^{-}$ transition
A comprehensive study of the impact of new-physics operators with different Lorentz structures on decays involving the $b \rightarrow s\mu^{+} \mu^{-}$ transition is performed. The effects of new vector– axial vector (VA), scalar–pseudoscalar (SP) and tensor (T) interactions on the differential branching ratios, forward–backward asymmetries ($A_{\text{FB}}$ ’s), and direct CP asymmetries of $\bar{B}_{s}^{0} \rightarrow \mu^{+} \mu^{-}, \bar{B}_{d}^{0} \rightarrow X_{s} \mu^{+} \mu^{-}, \bar{B}_{s}^{0} \rightarrow \mu^{+} \mu^{-} \gamma, \bar{B}_{d}^{0} \rightarrow \bar{K} \mu^{+} \mu^{-}$, and $\bar{B}_{d}^{0} \rightarrow \bar{K}^{*} \mu^{+} \mu^{-}$ are examined. In $\bar{B}_{d}^{0} \rightarrow \bar{K}^{*} \mu^{+} \mu^{-}$, we also explore the longitudinal polarization fraction $f_{\text{L}}$ and the angular asymmetries $A_{\text{T}}^{2}$ and $A_{\text{LT}}$, the direct CP asymmetries in them, as well as the triple-product CP asymmetries $A_{\text{T}}^{\text{(im)}}$ and $A_{\text{{LT}}^{\text{(im)}}$. While the new VA operators can significantly enhance most of the observables beyond the Standard Model predictions, the SP and T operators can do this only for $A_{\text{FB}}$ in $\bar{B}_{d}^{0} \rightarrow \bar{K} \mu^{+} \mu^{-}$.
Volume 79 Issue 5 November 2012 pp 1281-1284 Poster Presentations
$B_{s}$ data at Tevatron and possible new physics
Amol Dighe Diptimoy Ghosh Anirban Kundu Sunando Kumar Patra
The new physics (NP) is parametrized with four model-independent quantities: the magnitudes and phases of the dispersive part $M_{12}$ and the absorptive part $\Gamma_{12}$ of the NP contribution to the effective Hamiltonian. We constrain these parameters using the four observables $\Delta M_{\text{s}}$, $\Delta \Gamma_{\text{s}}$, the mixing phase $\beta_{\text{s}}^{J/\psi \phi}$ and $A_{\text{sl}}^{b}$. This formalism is extended to include charge-parity-time reversal (CPT) violation, and it is shown that CPT violation by itself, or even in the presence of CPTconserving NP without an absorptive part, helps only marginally in the simultaneous resolution of these anomalies.
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