A Study of D* Production in High-Energy $\gamma$ p Interactions

Sliwa, K. ; Appel, J.A. ; Biel, J. ; et al.
Phys.Rev.D 32 (1985) 1053-1060, 1985.
Inspire Record 194636 DOI 10.17182/hepdata.23561

We have studied D* production mechanisms using data from a photoproduction experiment at the Fermilab Tagged Photon Spectrometer. A large sample of charged D*’s was selected via the clean signature of the cascade decay D*→D0π+ and subsequently D0→K−π+ or D0→K−π+π0. The cross section for the process γp→(D*++anything)p at an average energy of 105 GeV was measured to be 88±32 nb. Only (11±7)% of D*’s were found to be consistent with being accompanied solely by a D¯* or a D¯; the remaining events contain additional particles. The distribution of the production angle of the D* in the photon-fragmentation-system center of mass is strongly anisotropic and consistent with the form f(θ*)=cos4θ*. We set a limit on the associated-production-process cross section σ(γp→(D¯*−+anything)Λc) x)<60 nb (90% C.L.).

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Inelastic and Elastic Photoproduction of J/$\psi$ (3097)

Denby, Bruce H. ; Bharadwaj, V.K. ; Summers, D.J. ; et al.
Phys.Rev.Lett. 52 (1984) 795-798, 1984.
Inspire Record 195929 DOI 10.17182/hepdata.20438

Inelastic and elastic $J/\psi$ photoproduction on hydrogen are investigated at a mean energy of 105 GeV. The inelastic cross section with $E_{\psi} / E_{\gamma}$ < 0.9 is significantly lower than the corresponding result for muoproduction on iron targets, but is consistent with a second-order perturbative QCD calculation.

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Measurement of $\omega$ Meson Photoproduction on Protons From 46 GeV to 180 GeV

Egloff, R.M. ; Davis, P.J. ; Luste, G.J. ; et al.
Phys.Rev.Lett. 43 (1979) 1545, 1979.
Inspire Record 142364 DOI 10.17182/hepdata.3122

Elastic ω-meson photoproduction on protons has been measured from 46 to 180 GeV. The cross section is approximately constant with photon energy and averages 1.10 ± 0.08 μb. The t dependence of the differential cross section is consistent with A exp(bt), where b=8.4±0.7 GeV−2. The photon-omega coupling constant, obtained from a normalization of hadron elastic-scattering cross sections to the photoproduction data of this experiment (with use of vector-meson dominance and an additive quark model), is γω24π=5.4±0.4.

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Measurements of the Photon Total Cross-Section on Protons from 18-GeV to 185-GeV

Caldwell, David O. ; Cumalat, John P. ; Eisner, A.M. ; et al.
Phys.Rev.Lett. 40 (1978) 1222, 1978.
Inspire Record 129172 DOI 10.17182/hepdata.3355

The photon total cross section on protons has been measured with high precision in the Fermilab tagged-photon beam for photon energies from 18 to 185 GeV. The cross section decreases to a broad minimum near 40 GeV, and then rises by about 4 μb over the remainder of the range. A ρ+ω+ϕ vector-dominance model (normalized to low-energy data) falls below the high-energy results by 2 to 6 μb, suggesting a contribution from charm-anticharm states.

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Measurement of Shadowing in Photon - Nucleus Total Cross-sections From 20-{GeV} to 185-{GeV}

Caldwell, David O. ; Cumalat, John P. ; Eisner, A.M. ; et al.
Phys.Rev.Lett. 42 (1979) 553, 1979.
Inspire Record 132972 DOI 10.17182/hepdata.20769

We have measured total hadronic photoproduction cross sections on carbon, copper, and lead. Tagged-photon energies ranged from 20 to 185 GeV for copper and from 45 to 82 GeV for carbon and lead. The energy and A dependence of shadowing were computed by comparing these results to the hydrogen cross section as measured nearly simultaneously with the same apparatus. We observed somewhat more shadowing than did most experiments at lower photon energies.

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Measurements of Elastic Rho and Phi Meson Photoproduction Cross-Sections on Protons from 30 GeV to 180 GeV

Egloff, R.M. ; Davis, P.J. ; Luste, G. ; et al.
Phys.Rev.Lett. 43 (1979) 657, 1979.
Inspire Record 141059 DOI 10.17182/hepdata.20740

The elastic photoproduction cross sections for ρ and ϕ mesons from protons have been measured from 30 to 180 GeV. The energy dependences agree well with predictions made by using vector-meson dominance and an additive quark model. The ρ cross section is approximately constant with energy while the ϕ cross section rises from 0.5 to 0.7 μb with increasing energy.

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Measurement of J/$\psi$ (3100) Photoproduction in Deuterium at 55-GeV

Nash, T. ; Belousov, A. ; Govorkov, B. ; et al.
Phys.Rev.Lett. 36 (1976) 1233, 1976.
Inspire Record 108460 DOI 10.17182/hepdata.12555

We report the result of a brief experiment to measure the cross section for photoproduction of Jψ(3100). At a mean energy of 55 GeV we find this cross section per nucleon to be 37.5 ± 8.2 (statistical) ± 4 (systematic) nb. The result establishes the previously indicated rise in Jψ photoproduction on protons above 20 GeV and suggests that the rise has occurred by 55 GeV.

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Measurement of the t anti-t production cross-section in p anti-p collisions at s**(1/2) = 1.96-TeV using lepton plus jets events with semileptonic B decays to muons

The CDF collaboration Acosta, D. ; Adelman, J. ; Affolder, T. ; et al.
Phys.Rev.D 72 (2005) 032002, 2005.
Inspire Record 683844 DOI 10.17182/hepdata.42761

We present a measurement of the $\ttbar$ production cross section using $194 \mathrm{pb^{-1}}$ of CDF II data using events with a high transverse momentum electron or muon, three or more jets, and missing transverse energy. The measurement assumes 100% $t\to Wb$ branching fraction. Events consistent with $\ttbar$ decay are found by identifying jets containing heavy flavor semileptonic decays to muons. The dominant backgrounds are evaluated directly from the data. Based on 20 candidate events and an expected background of 9.5$\pm$1.1 events, we measure a production cross section of $5.3\pm3.3^{+1.3}_{-1.0} \mathrm{pb}$, in agreement with the standard model.

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Measurement of the cross section for t anti-t production in p anti-p collisions using the kinematics of lepton + jets events

The CDF collaboration Acosta, D. ; Adelman, J. ; Affolder, T. ; et al.
Phys.Rev.D 72 (2005) 052003, 2005.
Inspire Record 681525 DOI 10.17182/hepdata.42764

We present a measurement of the top pair production cross section in $p\bar{p}$ collisions at $\sqrt{s}$=1.96 TeV. We collect a data sample with an integrated luminosity of 194$\pm$11 pb$^{-1}$ with the CDF II detector at the Fermilab Tevatron. We use an artificial neural network technique to discriminate between top pair production and background processes in a sample of 519 lepton+jets events, which have one isolated energetic charged lepton, large missing transverse energy and at least three energetic jets. We measure the top pair production cross section to be $\sigma_{t\bar{t}}= 6.6pm 1.1 \pm 1.5$ pb, where the first uncertainty is statistical and the second is systematic.

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Measurement of the t anti-t production cross section in p anti-p collisions at s**(1/2) = 1.96-TeV using dilepton events

The CDF collaboration Acosta, D. ; Affolder, T. ; Akimoto, T. ; et al.
Phys.Rev.Lett. 93 (2004) 142001, 2004.
Inspire Record 649267 DOI 10.17182/hepdata.54901

We report a measurement of the ttbar production cross section using dilepton events with jets and missing transverse energy in ppbar collisions at a center-of-mass energy of 1.96 TeV. Using a 197 +/- 12 pb-1 data sample recorded by the upgraded Collider Detector at Fermilab, we use two complementary techniques to select candidate events. We compare the number of observed events and selected kinematical distributions with the predictions of the Standard Model and find good agreement. The combined result of the two techniques yields a ttbar production cross section of 7.0 +2.4/-2.1(stat.) +1.6/-1.1(syst.) +/- 0.4(lum.) pb.

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