Universidad de Granada Digibug

Repositorio Institucional de la Universidad de Granada >
1.-Investigación >
Departamentos, Grupos de Investigación e Institutos >
Departamento de Física Teórica y del Cosmos >
DFTC - Artículos >

Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/30595

Title: Distinguishing seesaw models at LHC with multi-lepton signals
Authors: Águila Giménez, Francisco del
Aguilar-Saavedra, Juan Antonio
Issue Date: 2009
Abstract: We investigate the LHC discovery potential for electroweak scale heavy neutrino singlets (seesaw I), scalar triplets (seesaw II) and fermion triplets (seesaw III). For seesaw I we consider a heavy Majorana neutrino coupling to the electron or muon. For seesaw II we concentrate on the likely scenario where the new scalars decay to two leptons. For seesaw III we restrict ourselves to heavy Majorana fermion triplets decaying to light leptons plus gauge or Higgs bosons, which are dominant except for unnaturally small mixings. The possible signals are classified in terms of the charged lepton multiplicity, studying nine different final states ranging from one to six charged leptons. Using a fast detector simulation of signals and backgrounds, it is found that the trilepton channel ℓ±ℓ±ℓ∓ is by far the best one for scalar triplet discovery, and for fermion triplets it is as good as the like-sign dilepton channel ℓ±ℓ±. For heavy neutrinos with a mass O(100) GeV, this trilepton channel is also better than the usually studied like-sign dilepton mode. In addition to evaluating the discovery potential, we make special emphasis on the discrimination among seesaw models if a positive signal is observed. This could be accomplished not only by searching for signals in different final states, but also by reconstructing the mass and determining the charge of the new resonances, which is possible in several cases. For high luminosities, further evidence is provided by the analysis of the production angular distributions in the cleanest channels with three or four leptons.
Sponsorship: This work has been supported by MEC project FPA2006-05294 and Junta de Andalucía projects FQM 101, FQM 437 and FQM03048. The work of J.A.A.S. has been supported by a MEC Ramón y Cajal contract.
Publisher: Elsevier
Keywords: Seesaw models
LHC (Large Hadron Collider)
URI: http://hdl.handle.net/10481/30595
ISSN: 0550-3213
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Águila, F.; Aguilar-Saavedra, J.A. Distinguishing seesaw models at LHC with multi-lepton signals. Nuclear Physics B, 813(1-2): 22-90 (2009). [http://hdl.handle.net/10481/30595]
Appears in Collections:DFTC - Artículos

Files in This Item:

File Description SizeFormat
Aguila_SeesawModels.pdf1.15 MBAdobe PDFView/Open
Recommend this item

This item is licensed under a Creative Commons License
Creative Commons

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.


Valid XHTML 1.0! OpenAire compliant DSpace Software Copyright © 2002-2007 MIT and Hewlett-Packard - Feedback

© Universidad de Granada