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Title: Measurement of the differential cross sections for isolated direct photon pair production in $$p\bar{p}$$ collisions at $$\sqrt{s}$$= 1.96 TeV

Journal Article · · Physics Letters B
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We present measurements of direct photon pair production cross sections using 8.5fb-1 of data collected with the D0 detector at the Fermilab Tevatron $$p\bar{p}$$ collider. The results are presented as differential distributions of the photon pair invariant mass $$dσ/dM_{γγ}$$, pair transverse momentum $$dσ/dp^{γγ}_{T}$$, azimuthal angle between the photons $$dσ/dΔφ_{γγ}$$, and polar scattering angle in the Collins–Soper frame $dσ/d|cos θ*|$. Measurements are performed for isolated photons with transverse momenta $$p^γ_T$$ > 18(17)GeV for the leading (next-to-leading) photon in $$p_T$$, pseudorapidities , |$η^γ$| < 0.9 and a separation in η–φ space Δ$$\mathscr{R}_{γγ}$$ >0.4. We present comparisons with the predictions from Monte Carlo event generators DIPHOX and RESBOS implementing QCD calculations at next-to-leading order, 2γNNLO at next-to-next-to-leading order, and SHERPA using matrix elements with higher-order real emissions matched to parton shower.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE SC OFFICE OF SCIENCE (SC)
DOE Contract Number:
DE-AC02-98CH10886
OSTI ID:
1096388
Report Number(s):
BNL-102332-2013-JA; BNL-102332-2013-JARP; KA1101021
Journal Information:
Physics Letters B, Vol. 725, Issue 1-3; ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
United States
Language:
English

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