Скачать или смотреть Probing right handed neutrinos via tri lepton signals at the HL LHC

Ever wondered how right-handed neutrinos could unlock the mysteries of the universe? Discover how the High-Luminosity LHC might hold the key to uncovering these elusive particles. Join us as we explore cutting-edge research into neutrino masses and new physics!

FAQ:
1. What is the Standard Model (SM) and why do we need to go beyond it?
The Standard Model (SM) of particle physics is a well-established theory that describes the fundamental forces and particles that make up the universe. However, it has certain limitations, such as failing to explain neutrino masses and mixing, which have been experimentally observed. This implies the existence of physics beyond the SM.

2. What are right-handed neutrinos (RHNs) and how can they address the SM's shortcomings?
RHNs are hypothetical particles that are right-handed counterparts to the left-handed neutrinos present in the SM. Their inclusion can generate small neutrino masses through various mechanisms, such as the seesaw mechanism or loop-induced Dirac masses, thus addressing one of the SM's shortcomings.

3. What is NR-EFT and what role does it play in studying RHNs?
NR-EFT is an effective field theory framework that extends the SM by including RHNs as light degrees of freedom. It provides a systematic way to study the effects of RHNs at low energies, even if their masses are very large. It allows for the construction of higher-dimensional operators involving RHNs and SM fields, which can lead to new interactions and potentially observable signatures at colliders.

4. What specific operators within NR-EFT enhance RHN production at the LHC?
Two important operators are OHNe and OduNe. OHNe contributes to RHN production from the decay of W bosons, while OduNe involves a four-Fermi interaction that directly produces RHNs in association with an electron.

5. How do OHNe and OduNe affect the decay modes of RHNs?
OHNe directly influences decays like N → eW and N → eW* → elν. OduNe significantly contributes to the N → ejj decay mode, where j represents light quarks. The relative strengths of these operators and the mass of the RHN determine the branching ratios of different decay channels.

6. What are the key experimental signatures for RHNs at the LHC?
One prominent signature is the production of three leptons (tri-lepton) and missing transverse energy (MET). This can arise from the production of an RHN in association with an electron, followed by the RHN's decay into an electron, another lepton, and a neutrino.

7. What are the challenges in detecting RHNs at the LHC and how can they be addressed?
The signal cross-section for RHN production can be small, and the SM background can be significant. To enhance the signal significance, careful selection cuts need to be applied, and multivariate analysis techniques like Boosted Decision Trees (BDT) can be employed to improve background discrimination.

8. What are the prospects for discovering RHNs at the HL-LHC?
The HL-LHC, with its higher luminosity and energy, will significantly improve the sensitivity to RHN signals. Detailed collider analysis, including cut-based and multivariate techniques, shows promising results, particularly for certain mass ranges and combinations of the OHNe and OduNe operators. The use of new kinematic variables, along with BDT analysis, can enhance signal significance and potentially lead to the discovery of RHNs at the HL-LHC.

📖 Resources:
Read the paper written by Manimala Mitra, Subham Saha, Michael Spannowsky and Michihisa Takeuchi: [https://arxiv.org/pdf/2408.08565]

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