36 citations · 134 across the 18 of their papers we have counts for
16 papers · 1 filter
Soft Collinear Effective Theory for Heavy QCD Axions
Deepanshu Bisht, Sabyasachi Chakraborty, Siddhartha Karmakar +1
We develop a soft-collinear effective theory (SCET) framework for heavy QCD axion, considering two low-energy realizations and taking as a benchmark mode. In the first re…
Hilbert Series of Pseudoscalar Mesons: Operators and Sum Rules
Joydeep Chakrabortty, Sabyasachi Chakraborty, Siddhartha Karmakar
We construct the complete non-redundant basis of operators built from pseudoscalar mesons using the Hilbert series method, subject to the global flavor symmetry $SU(3)_L \times SU(…
Exploring observable effects of scalar operators beyond SMEFT in the angular distribution of
Siddhartha Karmakar, Amol Dighe
The invariance of the Standard Model Effective Field Theory (SMEFT) imposes relations among different low-energy effective field theory Wilson coefficients (…
SMEFT predictions for semileptonic processes
Siddhartha Karmakar, Amol Dighe, Rick S. Gupta
The invariance of the Standard Model Effective Field Theory (SMEFT) predicts multiple restrictions in the space of Wilson coefficients of invaria…
Gravitational Wave imprints of the Doublet Left-Right Symmetric Model
Siddhartha Karmakar, Dhruv Ringe
We study the gravitational wave (GW) signature in the doublet left-right symmetric model (DLRSM) resulting from the strong first-order phase transition (SFOPT) associated with $SU(…
Identifying physics beyond SMEFT in the angular distribution of decay
Siddhartha Karmakar, Susobhan Chattopadhyay, Amol Dighe
In the Standard Model Effective Field Theory (SMEFT), the symmetry of the Standard Model is linearly realized. However, it is possible that more general effe…
Constraints on the Doublet Left-Right Symmetric Model from Higgs data
Siddhartha Karmakar, Jai More, Akhila Kumar Pradhan +1
We study the constraints on the doublet left-right symmetric model (DLRSM) arising due to the Higgs data. The symmetry of this model is broken by three vacuum expectation…
Fermionic Singlet Dark Matter in One-Loop Solutions to the Anomaly: A Systematic Study
Mathias Becker, Dominik Döring, Siddhartha Karmakar +1
We study the dark matter phenomenology of Standard Model extensions addressing the reported anomaly in the observable at one-loop. The article covers the case of fermionic si…
Astronomy with energy dependent flavour ratios of extragalactic neutrinos
Siddhartha Karmakar, Sujata Pandey, Subhendu Rakshit
High energy astrophysical neutrinos interacting with ultralight dark matter (DM) can undergo flavour oscillations that induce an energy dependence in the flavour ratios. Such a dep…
XENON1T constraints on neutrino non-standard interactions
Siddhartha Karmakar, Sujata Pandey
The new XENON1T observation of dark matter-electron scattering cross-section, along with further constraining many popular dark matter models, has indicated the possibility of new…
Strong constraints on non-standard neutrino interactions: LHC vs. IceCube
Sujata Pandey, Siddhartha Karmakar, Subhendu Rakshit
We find the constraints on various non-standard interactions (NSI) of neutrinos from monojet+MET searches at the Large Hadron Collider (LHC). Also, we show that the measurement of…
Relaxed constraints on the heavy scalar masses in 2HDM
Siddhartha Karmakar, Subhendu Rakshit
In the wake of new scalar searches at LHC in various channels, it is interesting to investigate the sacrosanctity of the constraints on the masses and couplings of the heavier scal…
Are We Looking at Neutrino Absorption Spectra at IceCube?
Siddhartha Karmakar, Sujata Pandey, Subhendu Rakshit
The observed spectrum of ultrahigh energy neutrinos at IceCube might be indicative of absorption of such neutrinos in ultralight dark matter halos. We point out that various featur…
Interactions of Astrophysical Neutrinos with Dark Matter: A model building perspective
Sujata Pandey, Siddhartha Karmakar, Subhendu Rakshit
We explore the possibility that high energy astrophysical neutrinos can interact with the dark matter on their way to Earth. Keeping in mind that new physics might leave its signat…
Alignment Limit in 2HDM: Robustness put to test
Siddhartha Karmakar, Subhendu Rakshit
In a two-Higgs-doublet model (2HDM), at the vicinity of the alignment limit, the extra contributions to the couplings of the SM-like Higgs with other particles can be subdominant t…
Higher dimensional operators in 2HDM
Siddhartha Karmakar, Subhendu Rakshit
We present a complete (non-redundant) basis of CP- and flavour-conserving six-dimensional operators in a two Higgs doublet model (2HDM). We include Z_2-violating operators as well.…