Data taken from the Collider Detector at Fermilab (CDF) during the 1992-1993 run are used to measure the cross section for production of isolated prompt photons in p̄p collisions at √s = 1.8 TeV. Prompt photon production in p̄p collisions is sensitive to the gluon structure function of the proton and therefore can provide a test of QCD. This measurement is a significant improvement over the 1989 measurement due to the addition of the Central Preradiator Chambers, the neural network hardware trigger upgrades, and the six times increase in integrated luminosity. Two different methods, conversion method and profile method, were used to separate prompt photons from photons produced by decay of hadrons. The profile method was used from 10-16 GeV PT and the conversion method at PT > 16 GeV. The cross section, measured as a function of transverse momentum, is in general agreement with next-to-leading order QCD predictions over five orders of magnitude but has a steeper slope at low PT.
","abstract_html":"<p>Data taken from the Collider Detector at Fermilab (CDF) during the 1992-1993 run are used to measure the cross section for production of isolated prompt photons in p̄p collisions at √s = 1.8 TeV. Prompt photon production in p̄p collisions is sensitive to the gluon structure function of the proton and therefore can provide a test of QCD. This measurement is a significant improvement over the 1989 measurement due to the addition of the Central Preradiator Chambers, the neural network hardware trigger upgrades, and the six times increase in integrated luminosity. Two different methods, conversion method and profile method, were used to separate prompt photons from photons produced by decay of hadrons. The profile method was used from 10-16 GeV P<sub>T</sub> and the conversion method at P<sub>T</sub> > 16 GeV. The cross section, measured as a function of transverse momentum, is in general agreement with next-to-leading order QCD predictions over five orders of magnitude but has a steeper slope at low P<sub>T</sub>.</p>","abstract_has_math":false,"creators":["Maghakian, Arthur G"],"institution":null,"degree_name":"Doctor of Philosophy (PhD)","degree_level":"Thesis","degree_discipline":null,"degree_department":null,"school":null,"contributors":["Konstantin A. Goulianos"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":1996,"date_issued":"1996-01-01T08:00:00Z","date_published":"1996-01-01T08:00:00Z","updated_at":"2026-07-24T04:11:28Z","subjects":["prompt photons","proton-antiproton collisions","cross section","QCD test","transverse momentum","CDF detector","Physical Sciences and Mathematics"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://digitalcommons.rockefeller.edu/student_theses_and_dissertations/457","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Konstantin A. Goulianos"]},{"key":"dc:creator","label":"Author","values":["Maghakian, Arthur G"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Doctor of Philosophy (PhD)"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["prompt photons","proton-antiproton collisions","cross section","QCD test","transverse momentum","CDF detector","Physical Sciences and Mathematics"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://digitalcommons.rockefeller.edu/student_theses_and_dissertations/457"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Data taken from the Collider Detector at Fermilab (CDF) during the 1992-1993 run are used to measure the cross section for production of isolated prompt photons in p̄p collisions at √s = 1.8 TeV. Prompt photon production in p̄p collisions is sensitive to the gluon structure function of the proton and therefore can provide a test of QCD. This measurement is a significant improvement over the 1989 measurement due to the addition of the Central Preradiator Chambers, the neural network hardware trigger upgrades, and the six times increase in integrated luminosity. Two different methods, conversion method and profile method, were used to separate prompt photons from photons produced by decay of hadrons. The profile method was used from 10-16 GeV PT and the conversion method at PT > 16 GeV. The cross section, measured as a function of transverse momentum, is in general agreement with next-to-leading order QCD predictions over five orders of magnitude but has a steeper slope at low PT.
"]},{"key":"dc:title","label":"Title","values":["Direct Photon Differential Cross Section in p̄p Collisions at the Square Root of s = 1.8 TeV"]}]}],"canonical_facts":{"dc:contributor":["Konstantin A. Goulianos"],"dc:creator":["Maghakian, Arthur G"],"dc:description.abstract":["Data taken from the Collider Detector at Fermilab (CDF) during the 1992-1993 run are used to measure the cross section for production of isolated prompt photons in p̄p collisions at √s = 1.8 TeV. Prompt photon production in p̄p collisions is sensitive to the gluon structure function of the proton and therefore can provide a test of QCD. This measurement is a significant improvement over the 1989 measurement due to the addition of the Central Preradiator Chambers, the neural network hardware trigger upgrades, and the six times increase in integrated luminosity. Two different methods, conversion method and profile method, were used to separate prompt photons from photons produced by decay of hadrons. The profile method was used from 10-16 GeV PT and the conversion method at PT > 16 GeV. The cross section, measured as a function of transverse momentum, is in general agreement with next-to-leading order QCD predictions over five orders of magnitude but has a steeper slope at low PT.
"],"dc:identifier":["https://digitalcommons.rockefeller.edu/student_theses_and_dissertations/457"],"dc:subject":["prompt photons","proton-antiproton collisions","cross section","QCD test","transverse momentum","CDF detector","Physical Sciences and Mathematics"],"dc:title":["Direct Photon Differential Cross Section in p̄p Collisions at the Square Root of s = 1.8 TeV"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["Doctor of Philosophy (PhD)"]},"updated_at":"2026-07-24T04:11:28Z"}