A search for an excited muon decaying to a muon and two jets in pp collisions at √s=8 TeV with the ATLAS detector



Aad, G, Abbott, B, Abdallah, J, Abdinov, O, Abeloos, B, Aben, R, Abolins, M, AbouZeid, OS, Abramowicz, H, Abreu, H
et al (show 2813 more authors) (2016) A search for an excited muon decaying to a muon and two jets in pp collisions at √s=8 TeV with the ATLAS detector. NEW JOURNAL OF PHYSICS, 18 (7). 073021-.

[img] Text
1601.05627v3.pdf - Published version

Download (617kB)
[img] Text
1601.05627v3.pdf - Published version

Download (617kB)
[img] Text
1601.05627v3.pdf - Published version

Download (617kB)
[img] Atom XML (admin)
2017-05-12T11:14:32Z.atom - Unspecified

Download (0B)
[img] Atom XML (admin)
2017-05-12T12:14:12Z.atom - Unspecified

Download (0B)
[img] Atom XML (admin)
2017-05-12T13:14:00Z.atom - Unspecified

Download (0B)
[img] Atom XML (admin)
2017-05-12T14:13:59Z.atom - Unspecified

Download (0B)
[img] Atom XML (admin)
2017-05-12T15:14:10Z.atom - Unspecified

Download (0B)
[img] Atom XML (admin)
2017-05-12T16:14:09Z.atom - Unspecified

Download (0B)
[img] Atom XML (admin)
2017-05-12T17:13:53Z.atom - Unspecified

Download (0B)
[img] Atom XML (admin)
2017-05-12T18:14:10Z.atom - Unspecified

Download (0B)
[img] Atom XML (admin)
2017-05-12T19:13:59Z.atom - Unspecified

Download (0B)
[img] Atom XML (admin)
2017-05-12T20:14:13Z.atom - Unspecified

Download (0B)
[img] Atom XML (admin)
2017-05-12T21:14:08Z.atom - Unspecified

Download (0B)
[img] Atom XML (admin)
2017-05-12T22:14:07Z.atom - Unspecified

Download (0B)
[img] Atom XML (admin)
2017-05-12T23:19:09Z.atom - Unspecified

Download (0B)
[img] Atom XML (admin)
2017-05-13T00:15:31Z.atom - Unspecified

Download (0B)
[img] Atom XML (admin)
2017-05-13T01:14:33Z.atom - Unspecified

Download (0B)
[img] Atom XML (admin)
2017-05-13T02:14:15Z.atom - Unspecified

Download (0B)
[img] Atom XML (admin)
2017-05-13T03:14:16Z.atom - Unspecified

Download (0B)
[img] Atom XML (admin)
2017-05-13T04:22:54Z.atom - Unspecified

Download (0B)
[img] Atom XML (admin)
2017-05-13T05:14:15Z.atom - Unspecified

Download (0B)
[img] Atom XML (admin)
2017-05-13T06:14:07Z.atom - Unspecified

Download (0B)
[img] Atom XML (admin)
2017-05-13T07:14:12Z.atom - Unspecified

Download (0B)
[img] Atom XML (admin)
2017-05-13T08:14:13Z.atom - Unspecified

Download (0B)
[img] Atom XML (admin)
2017-05-13T09:14:12Z.atom - Unspecified

Download (0B)

Abstract

A new search signature for excited leptons is explored. Excited muons are sought in the channel $pp \to \mu\mu^* \to \mu \mu\textrm{ jet jet}$, assuming both the production and decay occur via a contact interaction. The analysis is based on 20.3 fb$^{-1}$ of $pp$ collision data at a centre-of-mass energy of $\sqrt{s}$ = 8 TeV taken with the ATLAS detector at the Large Hadron Collider. No evidence of excited muons is found, and limits are set at the 95% confidence level on the cross section times branching ratio as a function of the excited-muon mass $m_{\mu^*}$. For $m_{\mu^*}$ between 1.3 TeV and 3.0 TeV, the upper limit on $\sigma B(\mu^* \to \mu q \bar{q}$) is between 0.6 and 1 fb. Limits on $\sigma B$ are converted to lower bounds on the compositeness scale $\Lambda$. In the limiting case $\Lambda = m_{\mu^*}$, excited muons with a mass below 2.9 TeV are excluded. With the same model assumptions, these limits at larger $\mu^*$ masses improve upon previous limits from traditional searches based on the gauge-mediated decay $\mu^* \to \mu \gamma$.

Item Type: Article
Additional Information: 33 pages in total, author list starting page 16, 4 figures, 5 tables, final version published by New Journal of Physics including corrections in Erratum https://dx.doi.org/10.1088/1367-2630/ab46ed. All figures including auxiliary are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2015-01
Uncontrolled Keywords: excited leptons, lepton compositeness, leptoquarks
Depositing User: Symplectic Admin
Date Deposited: 21 Feb 2017 14:52
Last Modified: 18 Oct 2023 02:28
DOI: 10.1088/1367-2630/18/7/073021
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3005936