2 TeV walking technirho at LHC?
The ATLAS collaboration has recently reported an excess of about 2.5 σ global significance at around 2 TeV in the diboson channel with the boson-tagged fat dijets, which may imply a new resonance beyond the standard model. We provide a possible explanation of the excess as the isospin-triplet techni...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2015-11-01
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| Series: | Physics Letters B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S037026931500698X |
| _version_ | 1830518020946001920 |
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| author | Hidenori S. Fukano Masafumi Kurachi Shinya Matsuzaki Koji Terashi Koichi Yamawaki |
| author_facet | Hidenori S. Fukano Masafumi Kurachi Shinya Matsuzaki Koji Terashi Koichi Yamawaki |
| author_sort | Hidenori S. Fukano |
| collection | DOAJ |
| description | The ATLAS collaboration has recently reported an excess of about 2.5 σ global significance at around 2 TeV in the diboson channel with the boson-tagged fat dijets, which may imply a new resonance beyond the standard model. We provide a possible explanation of the excess as the isospin-triplet technivector mesons (technirhos, denoted as ρΠ±,3) of the walking technicolor in the case of the one-family model as a benchmark. As the effective theory for the walking technicolor at the scales relevant to the LHC experiment, we take a scale-invariant version of the hidden local symmetry model so constructed as to accommodate technipions, technivector mesons, and the technidilaton in such a way that the model respects spontaneously broken chiral and scale symmetries of the underlying walking technicolor. In particular, the technidilaton, a (pseudo) Nambu–Goldstone boson of the (approximate) scale symmetry predicted in the walking technicolor, has been shown to be successfully identified with the 125 GeV Higgs. Currently available LHC limits on those technihadrons are used to fix the couplings of technivector mesons to the standard-model fermions and weak gauge bosons. We find that the technirhos are mainly produced through the Drell–Yan process and predominantly decay to the dibosons, which accounts for the currently reported excess at around 2 TeV. The consistency with the electroweak precision test and other possible discovery channels of the 2 TeV technirhos are also addressed. |
| first_indexed | 2024-12-22T04:12:20Z |
| format | Article |
| id | doaj.art-005898650910472e87cc4022f4c85095 |
| institution | Directory Open Access Journal |
| issn | 0370-2693 1873-2445 |
| language | English |
| last_indexed | 2024-12-22T04:12:20Z |
| publishDate | 2015-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj.art-005898650910472e87cc4022f4c850952022-12-21T18:39:30ZengElsevierPhysics Letters B0370-26931873-24452015-11-01750C25926510.1016/j.physletb.2015.09.0232 TeV walking technirho at LHC?Hidenori S. Fukano0Masafumi Kurachi1Shinya Matsuzaki2Koji Terashi3Koichi Yamawaki4Kobayashi-Maskawa Institute for the Origin of Particles and the Universe (KMI), Nagoya University, Nagoya 464-8602, JapanInstitute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, JapanInstitute for Advanced Research, Nagoya University, Nagoya 464-8602, JapanThe University of Tokyo, International Center for Elementary Particle Physics and Department of Physics, 7-3-1 Hongo, Bunkyo-ku, JP - Tokyo 113-0033, JapanKobayashi-Maskawa Institute for the Origin of Particles and the Universe (KMI), Nagoya University, Nagoya 464-8602, JapanThe ATLAS collaboration has recently reported an excess of about 2.5 σ global significance at around 2 TeV in the diboson channel with the boson-tagged fat dijets, which may imply a new resonance beyond the standard model. We provide a possible explanation of the excess as the isospin-triplet technivector mesons (technirhos, denoted as ρΠ±,3) of the walking technicolor in the case of the one-family model as a benchmark. As the effective theory for the walking technicolor at the scales relevant to the LHC experiment, we take a scale-invariant version of the hidden local symmetry model so constructed as to accommodate technipions, technivector mesons, and the technidilaton in such a way that the model respects spontaneously broken chiral and scale symmetries of the underlying walking technicolor. In particular, the technidilaton, a (pseudo) Nambu–Goldstone boson of the (approximate) scale symmetry predicted in the walking technicolor, has been shown to be successfully identified with the 125 GeV Higgs. Currently available LHC limits on those technihadrons are used to fix the couplings of technivector mesons to the standard-model fermions and weak gauge bosons. We find that the technirhos are mainly produced through the Drell–Yan process and predominantly decay to the dibosons, which accounts for the currently reported excess at around 2 TeV. The consistency with the electroweak precision test and other possible discovery channels of the 2 TeV technirhos are also addressed.http://www.sciencedirect.com/science/article/pii/S037026931500698X |
| spellingShingle | Hidenori S. Fukano Masafumi Kurachi Shinya Matsuzaki Koji Terashi Koichi Yamawaki 2 TeV walking technirho at LHC? Physics Letters B |
| title | 2 TeV walking technirho at LHC? |
| title_full | 2 TeV walking technirho at LHC? |
| title_fullStr | 2 TeV walking technirho at LHC? |
| title_full_unstemmed | 2 TeV walking technirho at LHC? |
| title_short | 2 TeV walking technirho at LHC? |
| title_sort | 2 tev walking technirho at lhc |
| url | http://www.sciencedirect.com/science/article/pii/S037026931500698X |
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