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

V.M. Abazov; G. Bernardi; D. Brown; Y. Enari; J. Lellouch; D. Li; L. Zivkovic; U. Bassler; M. Besançon; E. Chapon; F. Couderc; F. Deliot; A. Grohsjean; Z. Hubacek; C. Royon; V. Shary; M. Titov; B. Tuchming; D. Vilanova; F. Miconi; I. Ripp-Baudot; G. Grenier; T. Kurca; P. Lebrun; G. Sajot; J. Stark; J.-F. Grivaz; T. Guillemin; M. Jaffré; P. Pétroff; F. Badaud; Ph. Gris; M.-C. Cousinou; A. Duperrin; W. Geng; E. Kajfasz; S. Kermiche; E. Nagy; N. Osman

doi:10.1016/j.physletb.2013.06.036

Journal articles

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

V.M. Abazov G. Bernardi ¹ D. Brown ¹ Y. Enari ¹ J. Lellouch ¹ D. Li ¹ L. Zivkovic ¹ U. Bassler ² M. Besançon ² E. Chapon ² F. Couderc ² F. Deliot ² A. Grohsjean ² Z. Hubacek ² C. Royon ² V. Shary ² M. Titov ² B. Tuchming ² D. Vilanova ² F. Miconi ³ I. Ripp-Baudot ³ G. Grenier ⁴ T. Kurca ⁴ P. Lebrun ⁴ G. Sajot ⁵ J. Stark ⁵ J.-F. Grivaz ⁶ T. Guillemin ⁶ M. Jaffré ⁶ P. Pétroff ⁶ F. Badaud ⁷ Ph. Gris ⁷ M.-C. Cousinou ⁸ A. Duperrin ⁸ W. Geng ⁸ E. Kajfasz ⁸ S. Kermiche ⁸ E. Nagy ⁸ N. Osman ⁸

1 LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies

2 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers

3 IPHC - Institut Pluridisciplinaire Hubert Curien

4 IPNL - Institut de Physique Nucléaire de Lyon

5 LPSC - Laboratoire de Physique Subatomique et de Cosmologie

6 LAL - Laboratoire de l'Accélérateur Linéaire

7 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand

8 CPPM - Centre de Physique des Particules de Marseille

Abstract : We present measurements of direct photon pair production cross sections using 8.5 fb$^{-1}$ 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 $d\sigma/dM_{\gamma \gamma}$, pair transverse momentum $d \sigma /dp^{\gamma \gamma}_T$, azimuthal angle between the photons $d\sigma/d\Delta \phi_{\gamma \gamma}$, and polar scattering angle in the Collins-Soper frame $d\sigma /d|\cos \theta^*|$. Measurements are performed for isolated photons with transverse momenta $p^{\gamma}_T>18 ~(17)$ GeV for the leading (next-to-leading) photon in $p_T$, pseudorapidities $|\eta^{\gamma}|<0.9$, and a separation in $\eta-\phi$ space $\Delta\mathcal R_{\gamma\gamma} > 0.4$. We present comparisons with the predictions from Monte Carlo event generators {\sc diphox} and {\sc resbos} implementing QCD calculations at next-to-leading order, $2\gamma${\sc nnlo} at next-to-next-to-leading order, and {\sc sherpa} using matrix elements with higher-order real emissions matched to parton shower.

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Journal articles

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Physics [physics] / High Energy Physics - Experiment [hep-ex]

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http://hal.in2p3.fr/in2p3-00779296
Contributor : Sylvie Flores <>
Submitted on : Tuesday, January 22, 2013 - 7:33:14 AM
Last modification on : Tuesday, June 30, 2020 - 10:00:47 AM

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

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

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