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Search for new phenomena in dijet events using 37 fb(-1) of pp collision data collected at root s=13 TeV with the ATLAS detector
KTH, School of Engineering Sciences (SCI), Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
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Number of Authors: 2849
2017 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 96, no 5, 052004Article in journal (Refereed) Published
Abstract [en]

Dijet events are studied in the proton-proton collision dataset recorded at root s = 13 TeV with the ATLAS detector at the Large Hadron Collider in 2015 and 2016, corresponding to integrated luminosities of 3.5 fb(-1) and 33.5 fb(-1) respectively. Invariant mass and angular distributions are compared to background predictions and no significant deviation is observed. For resonance searches, a new method for fitting the background component of the invariant mass distribution is employed. The dataset is then used to set upper limits at a 95% confidence level on a range of new physics scenarios. Excited quarks with masses below 6.0 TeV are excluded, and limits are set on quantum black holes, heavy W' bosons, W* bosons, and a range of masses and couplings in a Z' dark matter mediator model. Model-independent limits on signals with a Gaussian shape are also set, using a new approach allowing factorization of physics and detector effects. From the angular distributions, a scale of new physics in contact interaction models is excluded for scenarios with either constructive or destructive interference. These results represent a substantial improvement over those obtained previously with lower integrated luminosity.

Place, publisher, year, edition, pages
American Physical Society, 2017. Vol. 96, no 5, 052004
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Astronomy, Astrophysics and Cosmology
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URN: urn:nbn:se:kth:diva-217300DOI: 10.1103/PhysRevD.96.052004ISI: 000411988800002Scopus ID: 2-s2.0-85031108107OAI: oai:DiVA.org:kth-217300DiVA: diva2:1155178
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QC 20171107

Available from: 2017-11-07 Created: 2017-11-07 Last updated: 2017-11-29Bibliographically approved

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Kastanas, KonstatinosLund-Jensen, BengtRipellino, GiuliaSidebo, EdvinStrandberg, Jonas
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