Heavy neutrino signals at large hadron colliders

By F. Águila, J. A. Aguilar-Saavedra, R. Pittau. 2007

201 citations recorded by the source corpus.

We study the LHC discovery potential for heavy Majorana neutrino singlets in the process pp → W+ → l+N → l+l+jj (l = e, μ) plus its charge conjugate. With a fast detector simulation we show that backgrounds involving two like-sign charged leptons are not negligible and, moreover, they cannot be eliminated with simple sequential kinematical cuts. Using a likelihood analysis it is shown that, for heavy neutrinos coupling only to the muon, LHC has 5σ sensitivity for masses up to 200 GeV in the final state μ±μ±jj. This reduction in sensitivity, compared to previous parton-level estimates, is driven by the ~ 102−103 times larger background. Limits are also provided for e±e±jj and e±μ±jj final states, as well as for Tevatron. For heavy Dirac neutrinos the prospects are worse because backgrounds involving two opposite charge leptons are much larger. For this case, we study the observability of the lepton flavour violating signal e±μjj. As a by-product of our analysis, heavy neutrino production has been implemented within the ALPGEN framework.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/55a3490455b2e0ed3a6d1b1200c099550b6686d4

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In Nuclear and High Energy Physics

1. Z. Xing
2. M. Raidal
3. G. Arcadi
4. F. Queiroz
5. Yi-Fu Cai
6. Manfred Lindner
7. Moritz Platscher
8. R. Ruiz

Citations in the corpus

• A Call for New Physics : The Muon Anomalous Magnetic Moment and Lepton Flavor Violation (2016, background): “ive neutrino masses are generated via the addition of an SU(2) Lscalar triplet with weak hypercharge Y = 2 as follows [297, 298, 509] = 0 @ += p 2 ++ 0 += p 2 1 A; (204) which leads to the Lagrangian [212, 510, 511] LII seesaw = M 2 2Tr y h ‘‘0 C ‘L i˝ ‘0L + H Ti˝ yH+ h:c: ; (205) where L is the ”
• Flavor structures of charged fermions and massive neutrinos (2019, background): “In other words, the observability of Ni demands that their masses and Yukawa couplings be both experimentally accessible [579, 580].”
• Lepton Number Violation: Seesaw Models and Their Collider Tests (2017, methodology): “A brief comment is needed regarding choosing MLM+PS or NLO+PS computations: To produce MLM Monte Carlo samples, one must sum semi-inclusive channels with successively higher leg multiplicities in accordance with Equations (3.39)–(3.41) and correct for phase space double-counting.”
• Dark Matter through the Higgs portal (2019, background): “[133,318–328].”