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DTSTART;TZID=Europe/Ljubljana:20230608T140000
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DTSTAMP:20260426T031659
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UID:9088-1686232800-1686236400@web-f1.ijs.si
SUMMARY:Purushottam Sahu: Neutrinoless double beta decay in a left-right symmetric model with a double seesaw mechanism
DESCRIPTION:We discuss a left-right (L-R) symmetric model with the double seesaw mechanism at the TeV scale generating Majorana masses for the active left-handed (LH) flavour neutrinos$ u_{alpha L}$ and the heavy right-handed (RH) neutrinos $N_{beta R}$\, $alpha\,beta = e\,mu\,tau$\, which in turn\nmediate lepton number violating processes\, including neutrinoless double beta decay. The Higgs sector is composed of two Higgs doublets $H_L$\, $H_R$ and a bi-doublet $Phi$. The fermion sector has the usual for the L-R symmetric models quarks and leptons\, along with three $SU(2)$ singlet fermion $S_{gamma L}$. The choice of bare Majorana mass term for these sterile fermions induces large Majorana masses for the heavy RH neutrinos leading to two sets of heavy Majorana particles $N_j$ and $S_k$\, $j\,k=1\,2\,3$\, with masses $m_{N_j} ll m_{S_k}$. Working with a specific version of the model in which the $ u_{alpha L} – N_{beta R}$ and the $N_{beta R} – S_{gamma L}$ Dirac mass terms are diagonal\, and assuming that $m_{N_j} sim (1 – 1000)$ GeV and ${rm max}(m_{S_k}) sim (1 – 10)$ TeV\, $m_{N_j} ll m_{S_k}$\, we study in detail the new “non-standard” contributions to the $0 ubetabeta$ decay amplitude and half-life arising due to the exchange of virtual $N_j$ and $S_k$. We find that in both cases of NO and IO light neutrino mass spectra\, these contributions are strongly enhanced and are dominant at relatively small values of the lightest neutrino mass $m_{1(3)} sim (10^{-4} – 10^{-2})$ eV over the light Majorana neutrino exchange contribution. In large part of the parameter space\, the predictions of the model for the $0 ubetabeta$ decay generalised effective Majorana mass and half-life are within the sensitivity range of the planned next generation of neutrinoless double beta decay experiments LEGEND-200 (LEGEND-1000)\, nEXO\, KamlAND-Zen-II\, CUPID\, NEXT-HD.\nhttps://indico.ijs.si/event/1692/
URL:https://web-f1.ijs.si/event/purushottam-sahu-neutrinoless-double-beta-decay-in-a-left-right-symmetric-model-with-a-double-seesaw-mechanism/
LOCATION:https://zoom.us/j/3601731049?pwd=bVNQRjUxU2ExZ0cveWcxYXNUUGdjZz09 (F1 tea room)
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