Azimuthal decorrelations and multiple parton interactions in {gamma}+2 jet and {gamma}+3 jet events in pp collisions at {radical}(s)=1.96 TeV

Journal Article · Tue Mar 01 04:00:00 EST 2011 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.83.052008· OSTI ID:21578161

Abazov, V M; Alexeev, G D; Golovanov, G; Kharzheev, Y N; Malyshev, V L; Skachkov, N B; Tokmenin, V V; Verkheev, A; Vertogradov, L S; Yatsunenko, Y A ^[1]; Abbott, B; Gutierrez, P; Hossain, S; Severini, H; Skubic, P; Strauss, M; Svoisky, P ^[2]; Acharya, B S; Banerjee, S; Mondal, N K ^[3]

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1. Joint Institute for Nuclear Research, Dubna (Russian Federation)
2. University of Oklahoma, Norman, Oklahoma 73019 (United States)
3. Tata Institute of Fundamental Research, Mumbai (India)

Samples of inclusive {gamma}+2 jet and {gamma}+3 jet events collected by the D0 experiment with an integrated luminosity of about 1 fb{sup -1} in pp collisions at {radical}(s)=1.96 TeV are used to measure cross sections as a function of the angle in the plane transverse to the beam direction between the transverse momentum (p{sub T}) of the {gamma}+leading jet system (jets are ordered in p{sub T}) and p{sub T} of the other jet for {gamma}+2 jet, or p{sub T} sum of the two other jets for {gamma}+3 jet events. The results are compared to different models of multiple parton interactions (MPI) in the pythia and sherpa Monte Carlo (MC) generators. The data indicate a contribution from events with double parton (DP) interactions and are well-described by predictions provided by the pythia MPI models with p{sub T}-ordered showers and by sherpa with the default MPI model. The {gamma}+2 jet data are also used to determine the fraction of events with DP interactions as a function of the azimuthal angle and as a function of the second jet p{sub T}.

• OSTI ID: 21578161
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 5 Vol. 83; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYON-BARYON INTERACTIONS
BEAMS
CALCULATION METHODS
CROSS SECTIONS
ENERGY RANGE
FUNCTIONS
HADRON-HADRON INTERACTIONS
INTERACTIONS
LINEAR MOMENTUM
LUMINOSITY
MONTE CARLO METHOD
NUCLEON-NUCLEON INTERACTIONS
OPTICAL PROPERTIES
PARTICLE INTERACTIONS
PHYSICAL PROPERTIES
PROTON-NUCLEON INTERACTIONS
PROTON-PROTON INTERACTIONS
SHOWERS
TEV RANGE
TEV RANGE 01-10
TRANSVERSE MOMENTUM