Phillip Gutierrez

Department Chair and Professor



B.S. 1976 University of California-Riverside

Ph.D. 1983 University of California-Riverside



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Ph: (405) 325-8020

Office: 110 Nielsen Hall


Research Description

Over the past 40 plus years, I have carried out research in experimental high energy physics. The research has been performed at two of the premier high energy physics laboratories in the world, Fermilab near Chicago and the CERN laboratory near Geneva, Switzerland. Currently I am a member of the ATLAS collaboration,one of four research groups that use the Cern Large Hadron Collider, currently the world's highest energy particle collider. The goal of the research is to study all aspects of proton-proton collisions. This includes studying particles that are produced in these collisions, such as the top-quark and Higgs Boson, and refining previous measurements to set limits on how well the standard model (SM) of particle physics agrees with data. These measurements will ultimately lead to understanding of how the universe at its most fundamental level allowing us to answer such questions as the origin of mass and the asymmetry between matter and anti-matter in the universe, the origins of the universe and its evolution.

My research focus has been on the electroweak sector of the SM. This is the sector of the SM that unifies electromagnetism to the weak nuclear force through the Higgs mechanism and provides an explanation of why particles have mass and a mechanism for why there should be a matter anti-matter asymmetry in the universe. The theory is not complete and the underlying physics is not yet known. I have made measurement of top quark properties, precision measurement of electroweak interactions, and searches for phenomena predicted by extensions to the SM.

I have also worked on detector R&D;. This includes the development of drift chambers, liquid argon calorimeters, silicon strip and pixel detectors. Currently I am participating in the development of an updated silicon pixel for the ATLAS detector to be able to handle the higher collision rates of the upgrade LHC (HL-LHC). The detector is scheduled to be installed in 2025 and will become operation in 2027 when the HL-LHC starts producing collisions.

Full publication list sorted by most recent

Selected Publications

"Observation of the associated production of a top quark and a Z boson in pp collisions at √s= 13 TeV with the ATLAS detector," ATLAS Collaboration, Journal High Energy Physics, 124, (2020) DOI: 10.1016/j.physletb.2018.03.023

"Search for large missing transverse momentum in association with one top-quark in proton-proton collisions at √s = 13 TeV with the ATLAS detector," ATLAS Collaboration, Journal of High Energy Physics, 41, (2019) DOI: 10.1007/JHEP05(2019)041

"Properties of Zc± ( 3900 ) produced in p ¯ p collisions," DØ Collaboration, Physical Review D, 100, (2019) DOI: 10.1103/PhysRevD.100.012005

"Measurement of the production cross-section of a single top quark in association with a Z boson in proton–proton collisions at 13 TeV with the ATLAS detector," ATLAS Collaboration, Journal of High Energy Physics, 780, (2018) DOI: 10.1016/j.physletb.2018.03.023

"Measurement of the t ¯ t production cross section in the τ + jets final state in p p collisions at √ s = 8 TeV using the ATLAS detector," ATLAS Collaboration, Physical Review D, 95, (2017) DOI: 10.1103/PhysRevD.95.072003

See more publications.

Research Group

Muhammad Alhroob, Post Doc