• Pratishruti Saha

      Articles written in Pramana – Journal of Physics

    • Probing top anomalous couplings at the Tevatron and the Large Hadron Collider

      Debajyoti Choudhury Pratishruti Saha

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      Chromomagnetic and chromoelectric dipole interactions of the top quark are studied in a model-independent framework. Limits are set on the scale of new physics that might lead to such contributions using latest Tevatron measurements of the $t\bar{t}$ cross-section. It is demonstrated that the invariant mass distribution is a sensitive probe. Prospects at the LHC are examined. It is shown that, for unitarized amplitudes, an increase in the LHC energy is of little importance, while the accumulation of luminosity plays a crucial role.

    • Top polarization and exploration of $t\bar{t}$ forward–backward asymmetry

      Pratishruti Saha

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      The large forward–backward asymmetry in top pair-production observed at the Tevatron has generated much excitement in recent times.Many different models have been proposed as possible explanations for this anomaly. We discuss how the measurement of the polarization of the top quark can be used to establish the role of new physics in generating the observed asymmetry and to characterize and discriminate among various models.

    • Gravitons in multiply warped scenarios: At 750GeV and beyond


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      The search for extra dimensions has so far yielded no positive results at the LHC. Along with the discovery of a 125 GeV Higgs boson, this implies a moderate degree of fine-tuning in the parameter space of the Randall–Sundrum model. Within a six-dimensional warped compactification scenario, with its own interesting phenomenological consequences, the parameters associated with the additional spatial direction can be used to eliminate the need for fine-tuning.We examine the constraints on this model due to the 8 TeV LHC data and survey the parameter space that can be probed at the 14 TeV run of the LHC. We also identify the region of parameter space that is consistent with the recently reported excess in the diphoton channel in the 13 TeV data. Finally, as an alternative explanation for the observed excess, we discuss a scenario with brane-localized Einstein–Hilbert terms with Standard Model fields in the bulk.

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