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Improved bounds on the heavy neutrino productions at the LHC

Arindam Das* and Nobuchika Okada†

  • Department of Physics and Astronomy, University of Alabama, Tuscaloosa, Alabama 35487, USA

  • *adas8@ua.edu
  • †okadan@ua.edu
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Phys. Rev. D 93, 033003 – Published 5 February, 2016

DOI: https://doi.org/10.1103/PhysRevD.93.033003

Abstract

The Majorana neutrino in the type-I seesaw and the pseudo-Dirac neutrinos in the inverse seesaw can have sizable mixings with the light neutrinos in the standard model, through which the heavy neutrinos can be produced at the LHC. In producing the heavy neutrinos, we study a variety of initial states such as quark-quark, quark-gluon and gluon-gluon as well as photon mediated processes. For the Majorana heavy neutrino production, we consider a same-sign dilepton plus dijet as the signal events. Using the recent ATLAS and CMS data at s=8  TeV with 20.3 and 19.7  fb−1 luminosities, respectively, we obtain direct upper bounds on the light-heavy neutrino mixing angles. For the pseudo-Dirac heavy neutrino production we consider the final sate with a trilepton plus missing energy as the signal events. Using the recent anomalous multilepton search by CMS at s=8  TeV with 19.5  fb−1 luminosity, we obtain upper bounds on the mixing angles. Taking the varieties of initial states into account, the previously obtained upper bounds on the mixing angles have been improved. We scale our results at the 8 TeV LHC to obtain a prospective search reach at the 14 TeV LHC with high luminosities.

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References (89)

  1. J. Beringer et al. (Particle Data Group Collaboration), Review of Particle Physics, Phys. Rev. D 86, 010001 (2012).
  2. K. Abe et al. (T2K Collaboration), Indication of Electron Neutrino Appearance from an Accelerator-Produced Off-Axis Muon Neutrino Beam, Phys. Rev. Lett. 107, 041801 (2011).
  3. P. Adamson et al. (MINOS Collaboration), Improved Search for Muon-Neutrino to Electron-Neutrino Oscillations in MINOS, Phys. Rev. Lett. 107, 181802 (2011).
  4. Y. Abe et al. (DOUBLE-CHOOZ Collaboration), Indication of Reactor ν¯e Disappearance in the Double Chooz Experiment, Phys. Rev. Lett. 108, 131801 (2012).
  5. F. P. An et al. (DAYA-BAY Collaboration), Observation of Electron-Antineutrino Disappearance at Daya Bay, Phys. Rev. Lett. 108, 171803 (2012).
  6. J. K. Ahn et al. (RENO Collaboration), Observation of Reactor Electron Antineutrinos Disappearance in the RENO Experiment, Phys. Rev. Lett. 108, 191802 (2012).
  7. P. Minkowski, μ→eγ at a Rate of One Out of 109 Muon Decays?, Phys. Lett. 67B, 421 (1977).
  8. T. Yanagida, in Proceedings of the Workshop on the Unified Theory and the Baryon Number in the Universe, Held at National Laboratory for High-Energy Physics (KEK), 1979, edited by O. Sawada and A. Sugamoto (KEK, Tsukuba, Japan, 1979), p. 109.
  9. M. Gell-Mann, P. Ramond, and R. Slansky, Complex spinors and unified theories, Conf. Proc. C790927, 315 (1979).
  10. S. L. Glashow, The future of elementary particle physics, in Proceedings of the 1979 Cargese Summer Institute on Quarks and Leptons, edited by M. Levy, J.-L. Basdevant, D. Speiser, J. Speiser, R. Gatsmans, and M. Jacob (Plenum Press, New York, 1980).
  11. R. N. Mohapatra and G. Senjanovic, Neutrino Mass and Spontaneous Parity Violation, Phys. Rev. Lett. 44, 912 (1980).
  12. T. Saito, M. Asano, K. Fujii, N. Haba, S. Matsumoto, T. Nabeshima, Y. Takubo, H. Yamamoto, and K. Yoshioka, Extra dimensions and seesaw neutrinos at the International linear collider, Phys. Rev. D 82, 093004 (2010).
  13. S. Banerjee, P. S. B. Dev, A. Ibarra, T. Mandal, and M. Mitra, Prospects of heavy neutrino searches at future lepton colliders, Phys. Rev. D 92, 075002 (2015).
  14. J. A. Casas and A. Ibarra, Oscillating neutrinos and muon μ→e,γ, Nucl. Phys. B618, 171 (2001).
  15. R. N. Mohapatra, Mechanism for Understanding Small Neutrino Mass in Superstring Theories, Phys. Rev. Lett. 56, 561 (1986).
  16. R. N. Mohapatra and J. W. F. Valle, Neutrino mass and baryon-number nonconservation in superstring models, Phys. Rev. D 34, 1642 (1986).
  17. ATLAS Collaboration, ATLAS-CONF-2012-139; for a similar analysis (with weaker limits), see S. Chatrchyan et al. (CMS Collaboration), Search for heavy Majorana neutrinos in events in μ±μ±+jets and e±e±+jets events in pp collisions at s=8  TeV, Phys. Lett. B 717, 109 (2012).
  18. G. Aad et al. (ATLAS Collaboration), Search for heavy Majorana neutrinos with the ATLAS detector in pp collisions at s=8  TeV, J. High Energy Phys. 07 (2015) 162.
  19. V. Khachatryan et al. (CMS Collaboration), Search for heavy Majorana neutrinos in μ±μ±+jets events in proton-proton collisions at s=8  TeV, Phys. Lett. B 748, 144 (2015).
  20. CMS Collaboration, Search for anomalous production of events with three or more leptons in pp collisions at s=8  TeV, Phys. Rev. D 90, 032006 (2014); for an earlier analysis with s=7  TeV LHC data, see S. Chatrchyan et al. (CMS Collaboration), Search for anomalous production of multilepton events in pp collisions at s=7  TeV, J. High Energy Phys. 06 (2012) 169.
  21. P. S. B. Dev, R. Franceschini, and R. N. Mohapatra, Bounds on TeV seesaw models from LHC Higgs data, Phys. Rev. D 86, 093010 (2012).
  22. P. Achard et al. (L3 Collaboration), Search for heavy isosinglet neutrino in e+e− annihilation at LEP, Phys. Lett. B 517, 67 (2001).
  23. J. de Blas, Electroweak limits on physics beyond the Standard Mode, Eur. Phys. J. Web Conf. 60, 19008 (2013).
  24. For earlier fits, see F. del Aguila, J. de Blas, and M. Perez-Victoria, Effects of new leptons in electroweak precision data, Phys. Rev. D 78, 013010 (2008).
  25. E. Akhmedov, A. Kartavtsev, M. Lindner, L. Michaels, and J. Smirnov, Improving electro-weak fits with TeV-scale sterile neutrinos, J. High Energy Phys. 05 (2013) 081.
  26. L. Basso, O. Fischer, and J. J. van der Bij, Precision tests of unitarity in leptonic mixing, Europhys. Lett. 105, 11001 (2014).
  27. S. Antusch and O. Fischer, Non-unitarity of the leptonic mixing matrix: Present bounds and future sensitivities, J. High Energy Phys. 10 (2014) 94.
  28. A. Das, P. S. Bhupal Dev, and N. Okada, Direct bounds on electroweak scale pseudo-Dirac neutrinos from s=8  TeV LHC data, Phys. Lett. B 735, 364 (2014).
  29. T. Yanagida, Horizontal symmetry and masses of neutrinos, Prog. Theor. Phys. 64, 1103 (1980).
  30. J. Schechter and J. W. F. Valle, Neutrino masses in SU(2)×U(1) theories, Phys. Rev. D 22, 2227 (1980).
  31. A. Das and N. Okada, Inverse seesaw neutrino signatures at the LHC and ILC, Phys. Rev. D 88, 113001 (2013).
  32. J. Alwall, M. Herquet, F. Maltoni, O. Mattelaer, and T. Stelzer, MadGraph 5: Going Beyond, J. High Energy Phys. 06 (2011) 128.
  33. J. Alwall, R. Frederix, S. Frixione, V. Hirschi, F. Maltoni, O. Mattelaer, H.-S. Shao, T. Stelzer, P. Torrielli, and M. Zaro, The automated computation of tree-level and next-to-soft order differential cross sections, and their matching to parton shower simulations, J. High Energy Phys. 07 (2014) 079.
  34. A. Pilaftsis and T. E. J. Underwood, Resonant leptogenesis, Nucl. Phys. B692, 303 (2004).
  35. J. Kersten and A. Y. Smirnov, Right-handed neutrinos at CERN LHC and the mechanism of neutrino mass generation, Phys. Rev. D 76, 073005 (2007).
  36. Z.-z. Xing, Naturalness and testability of TeV seesaw mechanisms, Prog. Theor. Phys. Suppl. 180, 112 (2009).
  37. X.-G. He, S. Oh, J. Tandean, and C.-C. Wen, Large mixing of light and heavy neutrinos in seesaw models and the LHC, Phys. Rev. D 80, 073012 (2009).
  38. A. Ibarra, E. Molinaro, and S. T. Petcov, TeV scale see-saw mechanisms of neutrino mass generation, the Majorana nature of the heavy singlet neutrinos and (ββ)ov-decay, J. High Energy Phys. 09 (2010) 108.
  39. F. F. Deppisch and A. Pilaftsis, Phys. Rev. D 83, 076007 (2011).
  40. P. S. B. Dev, C.-H. Lee, and R. N. Mohapatra, Natural TeV-scale left-right seesaw mechanism for neutrinos and experimental tests, Phys. Rev. D 88, 093010 (2013).
  41. A. Datta, M. Guchait, and A. Pilaftsis, Probing lepton number violation via Majorana neutrinos at hadron supercolliders, Phys. Rev. D 50, 3195 (1994).
  42. T. Han and B. Zhang, Phys. Rev. Lett. 97, 171804 (2006).
  43. S. Bray, J. S. Lee, and A. Pilaftsis, Signatures for Majorana Neutrinos at Hadron Colliders, Nucl. Phys. B786, 95 (2007).
  44. F. del Aguila, J. A. Aguilar-Saavedra, and R. Pittau, Heavy neutrino signals at large hadron colliders, J. High Energy Phys. 10 (2007) 047.
  45. F. del Aguila and J. A. Aguilar-Saavedra, Distinguishing seesaw models at LHC with multi-lepton signals, Nucl. Phys. B813, 22 (2009).
  46. F. del Aguila and J. A. Aguilar-Saavedra, Electroweak scale seesaw and heavy Dirac neutrino signals at LHC, Phys. Lett. B 672, 158 (2009).
  47. G. Bambhaniya, S. Khan, P. Konar, and T. Mondal, Constraints on a seesaw model leading to quasidegenerate neutrinos and signatures at the LHC, Phys. Rev. D 91, 095007 (2015).
  48. G. Bambhaniya, S. Goswami, S. Khan, P. Konar, and T. Mondal, Looking for hints of a reconstructible seesaw model at the Large Hadron Collider, Phys. Rev. D 91, 075007 (2015).
  49. E. Arganda, M. J. Herrero, X. Marcano, and C. Weiland, Exotic μτjj events from heavy ISS neutrinos at the LHC, Phys. Lett. B 752, 46 (2016).
  50. M. Drewes, The phenomenology of right handed neutrinos, Int. J. Mod. Phys. E 22, 1330019 (2013).
  51. J. Gluza and T. Jeliński, Heavy neutrinos and the pp→ℓℓjj CMS data, Phys. Lett. B 748, 125 (2015).
  52. A. Datta, M. Guchait, and A. Pilaftsis, Probing lepton number violation via majorana neutrinos at hadron supercolliders, Phys. Rev. D 50, 3195 (1994).
  53. M. Drewes, Theoretical status of neutrino physics, Proc. Sci., NUFACT2014, (2015) 001 [arXiv:1502.06891].
  54. M. Drewes and B. Garbrecht, arXiv:1502.00477.
  55. S. M. Boucenna, S. Morisi, and J. W. F. Valle, The low-scale approach to neutrino masses, Adv. High Energy Phys. 2014, 1 (2014).
  56. F. F. Deppisch, P. S. B. Dev, and A. Pilaftsis, Neutrinos and collider physics, New J. Phys. 17, 075019 (2015).
  57. S. Alekhin et al., arXiv:1504.04855.
  58. M. Aoki, N. Haba, and R. Takahashi, A model realizing inverse seesaw and resonant leptogenesis, Prog. Theor. Exp. Phys. (2015) 113B03.
  59. P. Humbert, M. Lindner, and J. Smirnov, The inverse seesaw in conformal electro-weak symmetry breaking and phenomenological consequences, J. High Energy Phys. 06 (2015) 035.
  60. M. Lindner, S. Schmidt, and J. Smirnov, Neutrino masses and conformal electro-weak symmetry breaking, J. High Energy Phys. 10 (2014) 177.
  61. J. N. Ng, A. de la Puente, and B. W. P. Pan, Search for heavy right-handed neutrinos at the LHC and beyond in the same-sign leptons final state, J. High Energy Phys. 12 (2015) 172.
  62. D. Boyanovsky, Nearly degenerate heavy sterile neutrinos in cascade decay: Mixing and oscillations, Phys. Rev. D 90, 105024 (2014).
  63. B. Batell and M. McCullough, Neutrino masses from neutral top partners, Phys. Rev. D 92, 073018 (2015).
  64. E. Izaguirre and B. Shuve, Multilepton and lepton jet probes of sub-weak-scale right-handed neutrinos, Phys. Rev. D 91, 093010 (2015).
  65. R. Frederix and S. Frixione, Merging meets matching in MC@NLO, J. High Energy Phys. 12 (2012) 061.
  66. S. Hoeche, F. Krauss, N. Lavesson, L. Lonnblad, M. Mangano, A. Schalicke, and S. Schumann, Matching parton showers and matrix elements, arXiv:hep-ph/0602031.
  67. J. Alwall et al., Comparative study of various algorithms for the merging of parton showers and matrix elements in hadronic collisions, Eur. Phys. J. C 53, 473 (2008).
  68. J. Alwall, S. de Visscher, and F. Maltoni, QCD radiation in the production of heavy colored particles at the LHC, J. High Energy Phys. 02 (2009) 017.
  69. P. S. B. Dev, A. Pilaftsis, and U. K. Yang, New Production Mechanism for Heavy Neutrinos at the LHC, Phys. Rev. Lett. 112, 081801 (2014).
  70. D. Alva, T. Han, and R. Ruiz, Heavy Majorana neutrinos from the Wγ fusion at hadron colliders, J. High Energy Phys. 02 (2015) 072.
  71. C. F. von Weizsacker, Radiation emitted in collisions of very fast electrons, Z. Phys. 88, 612 (1934).
  72. E. J. Williams, Nature of the high-energy particles of penetrating radiation and status of ionization and radiation formulae, Phys. Rev. 45, 729 (1934).
  73. J. J. Sakurai and D. Schildknecht, Generalized vector dominance and inelastic electron-proton scattering, Phys. Lett. B 40, 121 (1972).
  74. H. Terazawa, Two photon processes for particle production at high-energies, Rev. Mod. Phys. 45, 615 (1973).
  75. V. M. Budnev, I. F. Ginzburg, G. V. Meledin, and V. G. Serbo, The process pp→ppe+e− and the possibility of its calculation by means of quantum electrodynamics only, Nucl. Phys. B63, 519 (1973).
  76. V. M. Budnev, I. F. Ginzburg, G. V. Meledin, and V. G. Serbo, The two photon particle production mechanism. Physical problems. Applications. Equivalent photon approximation, Phys. Rep. 15, 181 (1975).
  77. M. S. Chen, I. J. Muzinich, H. Terazawa, and T. P. Cheng, Lepton pair production from two-photon processes, Phys. Rev. D 7, 3485 (1973).
  78. S. Chatrchyan et al. (CMS Collaboration), Exclusive photon-photon production of muon pairs in proton-proton collisions at s=7  TeV, J. High Energy Phys. 01 (2012) 052.
  79. G. Aad et al. (ATLAS Collaboration), Measurement of exclusive γγ→ℓ+ℓ− production in proton-proton collisions at s=7  TeV with the ATLAS detector, Phys. Lett. B 749, 242 (2015).
  80. T. Sjostrand, S. Mrenna, and P. Z. Skands, PYTHIA 6.4 physics and manual, J. High Energy Phys. 05 (2006) 026.
  81. S. Ovyn, X. Rouby, and V. Lemaitre, Delphes, a framework for fast simulation of a generic collider experiment, arXiv:0903.2225.
  82. J. de Favereau, C. Delaere, P. Demin, A. Giammanco, V. Lemaître, A. Mertens, and M. Selvaggi (DELPHES 3 Collaboration), J. High Energy Phys. 02 (2014) 057.
  83. M. Cacciari, G. P. Salam, and G. Soyez, J. High Energy Phys. 04 (2008) 063.
  84. M. Cacciari, G. P. Salam, and G. Soyez, FastJet user manual, Eur. Phys. J. C 72, 1896 (2012).
  85. R. D. Ball, V. Bertone, S. Carrazza, L. D. Debbio, S. Forte, A. Guffanti, N. P. Hartland, and J. Rojo (NNPDF Collaboration), Parton distributions with QED corrections, Nucl. Phys. B877, 290 (2013).
  86. S. Carrazza (NNPDF Collaboration), Towards the determination of the photon parton distribution function constrained by LHC data, Proc. Sci., DIS2013 (2013) 279.
  87. S. Carrazza (NNPDF Collaboration), Towards an unbiased determination of parton distributions with QED corrections, arXiv:1305.4179.
  88. R. D. Ball et al. (NNPDF Collaboration), Parton distributions for the LHC Run II, J. High Energy Phys. 04 (2015) 040.
  89. J. Pumplin, D. R. Stump, J. Huston, H. L. Lai, P. M. Nadolsky, and W. K. Tung, New generation of parton distributions with uncertainties from global QCD analysis, J. High Energy Phys. 07 (2002) 012.

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Phys. Rev. D 93, 033003– Published 5 February, 2016
  • Received 29 October 2015

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