Herwig 7 is hosted by Hepforge, IPPP Durham

Plots from Rivet analyses

Direct photon pair production (D0_2010_S8570965)

Spires | arXiv:1002.4917

Direct photon pair production cross sections are measured using 4.2 fb$^{-1}$ of data. They are binned in diphoton mass, the transverse momentum of the diphoton system, the azimuthal angle between the photons, and the polar scattering angle of the photons. Also available are double differential cross sections considering the last three kinematic variables in three diphoton mass bins. Note, the numbers in version 1 of the arXiv preprint were missing the dM normalisation in the double differential cross sections. This has been reported to and fixed by the authors in v2 and the journal submission. HepData as well as the Rivet analysis have also been updated.

Isolated $\gamma$ + jet cross-sections, differential in pT($\gamma$) for various $y$ bins (D0_2008_S7719523)

Spires | Phys.Lett.B666:435-445,2008 | doi:10.1016/j.physletb.2008.06.076 | arXiv:0804.1107v2 [hep-ex]

The process $p \bar{p}$ -> photon + jet + X as studied by the D0 detector at the Fermilab Tevatron collider at center-of-mass energy sqrt(s) = 1.96 TeV. Photons are reconstructed in the central rapidity region $|y_\gamma| < 1.0$ with transverse momenta in the range 30--400 GeV, while jets are reconstructed in either the central $|y_\text{jet}| < 0.8$ or forward $1.5 < |y_\text{jet}| < 2.5$ rapidity intervals with $pT^\text{jet} > 15~\text{GeV}$. The differential cross section $\mathrm{d}^3 \sigma / \mathrm{d}{pT^\gamma} \mathrm{d}{y_\gamma} \mathrm{d}{y_\text{jet}}$ is measured as a function of $pT^\gamma$ in four regions, differing by the relative orientations of the photon and the jet. MC predictions have trouble with simultaneously describing the measured normalization and $pT^\gamma$ dependence of the cross section in any of the four measured regions.

Inclusive isolated photon cross-section, differential in pT(gamma) (D0_2006_S6438750)

Spires | Phys.Lett.B639:151-158,2006, Erratum-ibid.B658:285-289,2008 | doi:10.1016/j.physletb.2006.04.048 | arXiv:hep-ex/0511054 (plus erratum)

Measurement of differential cross section for inclusive production of isolated photons in p pbar collisions at sqrt(s) = 1.96 TeV with the D\O detector at the Fermilab Tevatron collider. The photons span transverse momenta 23--300 GeV and have pseudorapidity $|\eta| < 0.9$. Isolated direct photons are probes of pQCD via the annihilation ($q \bar{q} -> \gamma g$) and quark-gluon Compton scattering ($q g -> \gamma q$) processes, the latter of which is also sensitive to the gluon PDF. The initial state radiation / resummation formalisms are sensitive to the resulting photon pT spectrum

Measurement of the inclusive isolated prompt photon cross-section (CDF_2009_S8436959)

Spires | arXiv:0910.3623 [hep-ex]

A measurement of the cross section for the inclusive production of isolated photons. The measurement covers the pseudorapidity region $|\eta^\gamma|<1.0$ and the transverse energy range $E_T^\gamma>30$~GeV and is based on 2.5~fb$^{-1}$ of integrated luminosity. The cross section is measured differential in $E_\perp(\gamma)$.

Differential cross sections for prompt diphoton production (CDF_2005_S6080774)

Spires | Phys. Rev. Lett. 95, 022003 | doi:10.1103/PhysRevLett.95.022003 | arXiv:hep-ex/0412050

Measurement of the cross section of prompt diphoton production in $p\bar{p}$ collisions at $\sqrt{s} = 1.96$ TeV using a data sample of 207~pb$^{-1}$ as a function of the diphoton mass, the transverse momentum of the diphoton system, and the azimuthal angle between the two photons.


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