Search for black holes and sphalerons in high-multiplicity final states in proton-proton collisions at √s=13 TeV
A search in energetic, high-multiplicity final states for evidence of physics beyond the standard model, such as black holes, string balls, and electroweak sphalerons, is presented. The data sample corresponds to an integrated luminosity of 35.9 fb−1 collected with the CMS experiment at the LHC...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English English English |
| Published: |
Springer Verlag
2018
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/69723/ http://irep.iium.edu.my/69723/ http://irep.iium.edu.my/69723/ http://irep.iium.edu.my/69723/1/69723_earch%20for%20black%20holes%20and%20sphalerons%20_article.pdf http://irep.iium.edu.my/69723/2/69723_earch%20for%20black%20holes%20and%20sphalerons%20_scopus.pdf http://irep.iium.edu.my/69723/13/69723%20Search%20for%20black%20holes%20and%20sphalerons%20%20WOS.pdf |
| Summary: | A search in energetic, high-multiplicity final states for evidence of physics
beyond the standard model, such as black holes, string balls, and electroweak sphalerons,
is presented. The data sample corresponds to an integrated luminosity of 35.9 fb−1
collected
with the CMS experiment at the LHC in proton-proton collisions at a center-of-mass energy
of 13 TeV in 2016. Standard model backgrounds, dominated by multijet production, are
determined from control regions in data without any reliance on simulation. No evidence for
excesses above the predicted background is observed. Model-independent 95% confidence
level upper limits on the cross section of beyond the standard model signals in these final
states are set and further interpreted in terms of limits on semiclassical black hole, string
ball, and sphaleron production. In the context of models with large extra dimensions,
semiclassical black holes with minimum masses as high as 10.1 TeV and string balls with
masses as high as 9.5 TeV are excluded by this search. Results of the first dedicated search
for electroweak sphalerons are presented. An upper limit of 0.021 is set at 95% confidence
level on the fraction of all quark-quark interactions above the nominal threshold energy of
9 TeV resulting in the sphaleron transition. |
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