Search for lepton flavour violating decays of heavy resonances and quantum black holes to an eμ e μ pair in proton–proton collisions at √s=8 TeV s = 8 TeV
© 2016, CERN for the benefit of the CMS collaboration. A search for narrow resonances decaying to an electron and a muon is presented. The eμ mass spectrum is also investigated for non-resonant contributions from the production of quantum black holes (QBHs). The analysis is performed using data corr...
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| Format: | Article |
| Language: | English |
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Springer Science and Business Media LLC
2021
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| Online Access: | https://hdl.handle.net/1721.1/134304 |
| _version_ | 1826217483331174400 |
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| author | The CMS Collaboration |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics The CMS Collaboration |
| author_sort | The CMS Collaboration |
| collection | MIT |
| description | © 2016, CERN for the benefit of the CMS collaboration. A search for narrow resonances decaying to an electron and a muon is presented. The eμ mass spectrum is also investigated for non-resonant contributions from the production of quantum black holes (QBHs). The analysis is performed using data corresponding to an integrated luminosity of 19.7 fb-1 collected in proton-proton collisions at a centre-of-mass energy of 8 TeV with the CMS detector at the LHC. With no evidence for physics beyond the standard model in the invariant mass spectrum of selected eμ pairs, upper limits are set at 95 % confidence level on the product of cross section and branching fraction for signals arising in theories with charged lepton flavour violation. In the search for narrow resonances, the resonant production of τ sneutrino in R-parity violating supersymmetry is considered. The τ sneutrino is excluded for masses below 1.28 TeV for couplings λ132= λ231= λ311′= 0.01 , and below 2.30 TeV for λ132= λ231= 0.07 and λ311′= 0.11. These are the most stringent limits to date from direct searches at high-energy colliders. In addition, the resonance searches are interpreted in terms of a model with heavy partners of the Z boson and the photon. In a framework of TeV-scale quantum gravity based on a renormalization of Newton’s constant, the search for non-resonant contributions to the eμ mass spectrum excludes QBH production below a threshold mass Mth of 1.99 TeV. In models that invoke extra dimensions, the bounds range from 2.36 TeV for one extra dimension to 3.63 TeV for six extra dimensions. This is the first search for QBHs decaying into the eμ final state. |
| first_indexed | 2024-09-23T17:04:22Z |
| format | Article |
| id | mit-1721.1/134304 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T17:04:22Z |
| publishDate | 2021 |
| publisher | Springer Science and Business Media LLC |
| record_format | dspace |
| spelling | mit-1721.1/1343042023-01-06T17:47:40Z Search for lepton flavour violating decays of heavy resonances and quantum black holes to an eμ e μ pair in proton–proton collisions at √s=8 TeV s = 8 TeV The CMS Collaboration Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Laboratory for Nuclear Science © 2016, CERN for the benefit of the CMS collaboration. A search for narrow resonances decaying to an electron and a muon is presented. The eμ mass spectrum is also investigated for non-resonant contributions from the production of quantum black holes (QBHs). The analysis is performed using data corresponding to an integrated luminosity of 19.7 fb-1 collected in proton-proton collisions at a centre-of-mass energy of 8 TeV with the CMS detector at the LHC. With no evidence for physics beyond the standard model in the invariant mass spectrum of selected eμ pairs, upper limits are set at 95 % confidence level on the product of cross section and branching fraction for signals arising in theories with charged lepton flavour violation. In the search for narrow resonances, the resonant production of τ sneutrino in R-parity violating supersymmetry is considered. The τ sneutrino is excluded for masses below 1.28 TeV for couplings λ132= λ231= λ311′= 0.01 , and below 2.30 TeV for λ132= λ231= 0.07 and λ311′= 0.11. These are the most stringent limits to date from direct searches at high-energy colliders. In addition, the resonance searches are interpreted in terms of a model with heavy partners of the Z boson and the photon. In a framework of TeV-scale quantum gravity based on a renormalization of Newton’s constant, the search for non-resonant contributions to the eμ mass spectrum excludes QBH production below a threshold mass Mth of 1.99 TeV. In models that invoke extra dimensions, the bounds range from 2.36 TeV for one extra dimension to 3.63 TeV for six extra dimensions. This is the first search for QBHs decaying into the eμ final state. 2021-10-27T20:04:23Z 2021-10-27T20:04:23Z 2016 2019-05-14T12:54:43Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/134304 en 10.1140/EPJC/S10052-016-4149-Y The European Physical Journal C - Particles and Fields Creative Commons Attribution 4.0 International license https://creativecommons.org/licenses/by/4.0/ application/pdf Springer Science and Business Media LLC Springer |
| spellingShingle | The CMS Collaboration Search for lepton flavour violating decays of heavy resonances and quantum black holes to an eμ e μ pair in proton–proton collisions at √s=8 TeV s = 8 TeV |
| title | Search for lepton flavour violating decays of heavy resonances and quantum black holes to an eμ e μ pair in proton–proton collisions at √s=8 TeV s = 8 TeV |
| title_full | Search for lepton flavour violating decays of heavy resonances and quantum black holes to an eμ e μ pair in proton–proton collisions at √s=8 TeV s = 8 TeV |
| title_fullStr | Search for lepton flavour violating decays of heavy resonances and quantum black holes to an eμ e μ pair in proton–proton collisions at √s=8 TeV s = 8 TeV |
| title_full_unstemmed | Search for lepton flavour violating decays of heavy resonances and quantum black holes to an eμ e μ pair in proton–proton collisions at √s=8 TeV s = 8 TeV |
| title_short | Search for lepton flavour violating decays of heavy resonances and quantum black holes to an eμ e μ pair in proton–proton collisions at √s=8 TeV s = 8 TeV |
| title_sort | search for lepton flavour violating decays of heavy resonances and quantum black holes to an eμ e μ pair in proton proton collisions at √s 8 tev s 8 tev |
| url | https://hdl.handle.net/1721.1/134304 |
| work_keys_str_mv | AT thecmscollaboration searchforleptonflavourviolatingdecaysofheavyresonancesandquantumblackholestoanemempairinprotonprotoncollisionsats8tevs8tev |