Abstract
The CMS experiment at the Large Hadron Collider has reported a 2.8σ excess in the (2e)(2jets) channel around 2.1 TeV. Interpretation of this data is reconsidered in terms of the production of a right-handed weak gauge boson, W R , of the left-right symmetric model and in an SO(10) grand unified theory abiding by the Extended Survival Hypothesis. The left-right symmetric model can be consistent with this excess if (a) the heavy right-handed neutrino has a mass near W R , or (b) if g L ≠ g R , or (c) the right-handed CKM matrix is nontrivial. Combinations of the above possibilities are also viable. A W R with a mass in the TeV region if embedded in SO(10) is not compatible with g L = g R . Rather, it implies 0.64 ≤ g R /g L ≤ 0.78. Further, a unique symmetry-breaking route — the order being left-right discrete symmetry breaking first, followed by SU(4) C and finally SU(2) R — to the standard model is picked out. The L ↔ R discrete symmetry has to be broken at around 1016 GeV. The grand unification scale is pushed to 1018 GeV making the detection of proton decay in ongoing searches rather unlikely. The SU(4) C breaking scale can be at its allowed lower limit of 106 GeV so that \( n-\overline{n} \) oscillation or flavour changing processes such as K L → μe and B d,s → μe may be detectable. The Higgs scalar multiplets responsible for SO(10) symmetry breaking at various stages are uniquely identified so long as one adheres to a minimalist principle. We also remark, en passant, about a partially unified Pati-Salam model.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
J.C. Pati and A. Salam, Is baryon number conserved?, Phys. Rev. Lett. 31 (1973) 661 [INSPIRE].
J.C. Pati and A. Salam, Lepton number as the fourth color, Phys. Rev. D 10 (1974) 275 [Erratum ibid. D 11 (1975) 703] [INSPIRE].
R.N. Mohapatra and J.C. Pati, Left-right gauge symmetry and an isoconjugate model of CP-violation, Phys. Rev. D 11 (1975) 566 [INSPIRE].
R.N. Mohapatra and J.C. Pati, A natural left-right symmetry, Phys. Rev. D 11 (1975) 2558 [INSPIRE].
G. Senjanović and R.N. Mohapatra, Exact left-right symmetry and spontaneous violation of parity, Phys. Rev. D 12 (1975) 1502 [INSPIRE].
H. Georgi, The state of the art-gauge theories, AIP Conf. Proc. 23 (1975) 575.
H. Fritzsch and P. Minkowski, Unified interactions of leptons and hadrons, Annals Phys. 93 (1975) 193 [INSPIRE].
CMS collaboration, Search for heavy neutrinos and W bosons with right-handed couplings in proton-proton collisions at \( \sqrt{s}=8 \) TeV, Eur. Phys. J. C 74 (2014) 3149 [arXiv:1407.3683] [INSPIRE].
CMS collaboration, Search for heavy neutrinos and W R bosons with right-handed couplings in a left-right symmetric model in pp collisions at \( \sqrt{s}=7 \) TeV, Phys. Rev. Lett. 109 (2012) 261802 [arXiv:1210.2402] [INSPIRE].
CMS collaboration, Search for W′ → tb decays in the lepton + jets final state in pp collisions at \( \sqrt{s}=8 \) TeV, JHEP 05 (2014) 108 [arXiv:1402.2176] [INSPIRE].
ATLAS collaboration, Search for heavy neutrinos and right-handed W bosons in events with two leptons and jets in pp collisions at \( \sqrt{s}=7 \) TeV with the ATLAS detector, Eur. Phys. J. C 72 (2012) 2056 [arXiv:1203.5420] [INSPIRE].
ATLAS collaboration, Search for tb resonances in proton-proton collisions at \( \sqrt{s}=7 \) TeV with the ATLAS detector, Phys. Rev. Lett. 109 (2012) 081801 [arXiv:1205.1016] [INSPIRE].
J.A. Aguilar-Saavedra and F.R. Joaquim, Closer look at the possible CMS signal of a new gauge boson, Phys. Rev. D 90 (2014) 115010 [arXiv:1408.2456] [INSPIRE].
B.A. Dobrescu and Z. Liu, W′ boson near 2 TeV: predictions for Run 2 of the LHC, Phys. Rev. Lett. 115 (2015) 211802 [arXiv:1506.06736] [INSPIRE].
F.F. Deppisch, T.E. Gonzalo, S. Patra, N. Sahu and U. Sarkar, Signal of right-handed charged gauge bosons at the LHC?, Phys. Rev. D 90 (2014) 053014 [arXiv:1407.5384] [INSPIRE].
F.F. Deppisch, T.E. Gonzalo, S. Patra, N. Sahu and U. Sarkar, Double beta decay, lepton flavor violation and collider signatures of left-right symmetric models with spontaneous D-parity breaking, Phys. Rev. D 91 (2015) 015018 [arXiv:1410.6427] [INSPIRE].
M. Heikinheimo, M. Raidal and C. Spethmann, Testing right-handed currents at the LHC, Eur. Phys. J. C 74 (2014) 3107 [arXiv:1407.6908] [INSPIRE].
J. Gluza and T. Jelinski, Heavy neutrinos and the pp → lljj CMS data, Phys. Lett. B 748 (2015) 125 [arXiv:1504.05568] [INSPIRE].
B.A. Dobrescu and A. Martin, Interpretations of anomalous LHC events with electrons and jets, Phys. Rev. D 91 (2015) 035019 [arXiv:1408.1082] [INSPIRE].
M.K. Parida and B. Sahoo, Planck-scale induced left-right gauge theory at LHC and experimental tests, arXiv:1411.6748 [INSPIRE].
D. Chang, R.N. Mohapatra and M.K. Parida, Decoupling parity and SU(2) R breaking scales: a new approach to left-right symmetric models, Phys. Rev. Lett. 52 (1984) 1072 [INSPIRE].
D. Chang, R.N. Mohapatra and M.K. Parida, A new approach to left-right symmetry breaking in unified gauge theories, Phys. Rev. D 30 (1984) 1052 [INSPIRE].
D. Chang, R.N. Mohapatra, J. Gipson, R.E. Marshak and M.K. Parida, Experimental tests of new SO(10) grand unification, Phys. Rev. D 31 (1985) 1718 [INSPIRE].
T.W.B. Kibble, G. Lazarides and Q. Shafi, Walls bounded by strings, Phys. Rev. D 26 (1982) 435 [INSPIRE].
V.A. Kuzmin and M.E. Shaposhnikov, Baryon asymmetry of the universe versus left-right symmetry, Phys. Lett. B 92 (1980) 115 [INSPIRE].
W.-Y. Keung and G. Senjanović, Majorana neutrinos and the production of the right-handed charged gauge boson, Phys. Rev. Lett. 50 (1983) 1427 [INSPIRE].
P.S. Bhupal Dev and R.N. Mohapatra, Unified explanation of the eejj, diboson and dijet resonances at the LHC, Phys. Rev. Lett. 115 (2015) 181803 [arXiv:1508.02277] [INSPIRE].
ATLAS collaboration, Search for heavy Majorana neutrinos with the ATLAS detector in pp collisions at \( \sqrt{s}=8 \) TeV, JHEP 07 (2015) 162 [arXiv:1506.06020] [INSPIRE].
H. Georgi and C. Jarlskog, A new lepton-quark mass relation in a unified theory, Phys. Lett. B 86 (1979) 297 [INSPIRE].
H. Georgi and D.V. Nanopoulos, Masses and mixing in unified theories, Nucl. Phys. B 159 (1979) 16 [INSPIRE].
F. del Aguila and L.E. Ibáñez, Higgs bosons in SO(10) and partial unification, Nucl. Phys. B 177 (1981) 60 [INSPIRE].
R.N. Mohapatra and G. Senjanović, Higgs boson effects in grand unified theories, Phys. Rev. D 27 (1983) 1601 [INSPIRE].
Particle Data Group collaboration, K.A. Olive et al., Review of particle physics, Chin. Phys. C 38 (2014) 090001 [INSPIRE].
N.G. Deshpande and R.J. Johnson, Experimental limit on SU(4) C gauge boson mass, Phys. Rev. D 27 (1983) 1193 [INSPIRE].
M.K. Parida and B. Purkayastha, New lower bound on SU(4) C gauge boson mass from CERN LEP measurements and K L → μe, Phys. Rev. D 53 (1996) 1706 [INSPIRE].
Super-Kamiokande collaboration, K. Abe et al., Search for nucleon decay via \( n\to \overline{\nu}{\pi}^0 \) and \( p\to \overline{\nu}{\pi}^{+} \) in Super-Kamiokande, Phys. Rev. Lett. 113 (2014) 121802 [arXiv:1305.4391] [INSPIRE].
LHCb collaboration, Search for the lepton-flavor violating decays B 0 s → e ± μ ∓ and B 0 → e ± μ ∓, Phys. Rev. Lett. 111 (2013) 141801 [arXiv:1307.4889] [INSPIRE].
Super-Kamiokande collaboration, K. Abe et al., The search for \( n\hbox{-} \overline{n} \) oscillation in Super-Kamiokande I, Phys. Rev. D 91 (2015) 072006 [arXiv:1109.4227] [INSPIRE].
D.R.T. Jones, The two loop β-function for a G 1 × G 2 gauge theory, Phys. Rev. D 25 (1982) 581 [INSPIRE].
M.E. Machacek and M.T. Vaughn, Two loop renormalization group equations in a general quantum field theory 1. Wave function renormalization, Nucl. Phys. B 222 (1983) 83 [INSPIRE].
M.E. Machacek and M.T. Vaughn, Two loop renormalization group equations in a general quantum field theory 2. Yukawa couplings, Nucl. Phys. B 236 (1984) 221 [INSPIRE].
M.E. Machacek and M.T. Vaughn, Two loop renormalization group equations in a general quantum field theory 3. Scalar quartic couplings, Nucl. Phys. B 249 (1985) 70 [INSPIRE].
ATLAS collaboration, Search for high-mass diboson resonances with boson-tagged jets in proton-proton collisions at \( \sqrt{s}=8 \) TeV with the ATLAS detector, JHEP 12 (2015) 055 [arXiv:1506.00962] [INSPIRE].
J. Brehmer, J. Hewett, J. Kopp, T. Rizzo and J. Tattersall, Symmetry restored in dibosons at the LHC?, JHEP 10 (2015) 182 [arXiv:1507.00013] [INSPIRE].
K. Cheung, W.-Y. Keung, P.-Y. Tseng and T.-C. Yuan, Interpretations of the ATLAS diboson anomaly, Phys. Lett. B 751 (2015) 188 [arXiv:1506.06064] [INSPIRE].
F.F. Deppisch et al., Reconciling the 2 TeV excesses at the LHC in a linear seesaw left-right model, Phys. Rev. D 93 (2016) 013011 [arXiv:1508.05940] [INSPIRE].
Open Access
This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.
Author information
Authors and Affiliations
Corresponding author
Additional information
ArXiv ePrint: 1509.03232
Rights and permissions
Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0), which permits use, duplication, adaptation, distribution, and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
About this article
Cite this article
Bandyopadhyay, T., Brahmachari, B. & Raychaudhuri, A. Implications of the CMS search for W R on grand unification. J. High Energ. Phys. 2016, 23 (2016). https://doi.org/10.1007/JHEP02(2016)023
Received:
Revised:
Accepted:
Published:
DOI: https://doi.org/10.1007/JHEP02(2016)023