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Phys. Rev. D 80, 073015 (2009) [22 pages]

Testability of the type I seesaw mechanism at the CERN LHC: Revealing the existence of the B-L symmetry

Pavel Fileviez Pérez,1 Tao Han,1,2 and Tong Li2
1Department of Physics, University of Wisconsin, Madison, Wisconsin 53706, USA
2Center for High Energy Physics, Peking University, Beijing 100871, People's Republic of China

Received 1 August 2009; published 29 October 2009

We study the possibility to test the type I seesaw mechanism for neutrino masses at the CERN Large Hadron Collider. The inclusion of three generations of right-handed neutrinos (Ni) provides an attractive option of gauging the B-L accidental symmetry in the standard model (as well as an extended symmetry X=Y-5(B-L)/4). The production mechanisms for the right-handed neutrinos through the Z[prime] gauge boson in the U(1)B-L and U(1)X extensions of the standard model are studied. We discuss the flavor combinations of the charged leptons from the decays of Ni in the DeltaL=2 channels. We find that the clean channels with dilepton plus jets and possible secondary vertices of the N decay could provide conclusive signals at the LHC in connection with the hierarchical pattern of the light neutrino masses and mixing properties within the type I seesaw mechanism.

©2009 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevD.80.073015
DOI: 10.1103/PhysRevD.80.073015
PACS: 14.60.St; 13.85.Qk
  • 14.60.St
    Non-standard-model neutrinos, right-handed neutrinos, etc.
  • 13.85.Qk
    Hadron-induced inclusive production with identified leptons, photons, or other nonhadronic particles (energy>10 GeV)
  • YEAR: 2009

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