Comparison of the isolated direct photon cross sections in p(p)over-bar collisions at root s=1.8 TeV and root s=0.63 TeV
We have measured the cross sections d2σ/d P Tdη) for production of isolated direct photons in pp̄ collisions at two different center-of-mass energies, 1.8 TeV and 0.63 TeV, using the Collider Detector at Fermilab. The normalization of both data sets agrees with the predictions of quantum chromodynam...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , |
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| 格式: | Journal article |
| 語言: | English |
| 出版: |
2002
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| _version_ | 1826304351527763968 |
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| author | Acosta, D Affolder, T Akimoto, H Albrow, MG Ambrose, D Amidei, D Anikeev, K Antos, J Apollinari, G Arisawa, T Artikov, A Asakawa, T Ashmanskas, W Azfar, F Azzi-Bacchetta, P Bacchetta, N Bachacou, H Badgett, W Bailey, S de Barbaro, P Barbaro-Galtieri, A Barnes, V Barnett, B Baroiant, S Barone, M |
| author_facet | Acosta, D Affolder, T Akimoto, H Albrow, MG Ambrose, D Amidei, D Anikeev, K Antos, J Apollinari, G Arisawa, T Artikov, A Asakawa, T Ashmanskas, W Azfar, F Azzi-Bacchetta, P Bacchetta, N Bachacou, H Badgett, W Bailey, S de Barbaro, P Barbaro-Galtieri, A Barnes, V Barnett, B Baroiant, S Barone, M |
| author_sort | Acosta, D |
| collection | OXFORD |
| description | We have measured the cross sections d2σ/d P Tdη) for production of isolated direct photons in pp̄ collisions at two different center-of-mass energies, 1.8 TeV and 0.63 TeV, using the Collider Detector at Fermilab. The normalization of both data sets agrees with the predictions of quantum chromodynamics for a photon transverse momentum (PT) of 25 GeV/c, but the shapes versus photon PT do not. These shape differences lead to a significant disagreement in the ratio of cross sections in the scaling variable xT(≡ 2PT/√s). This disagreement in the xT ratio is difficult to explain with conventional theoretical uncertainties such as scale dependence and parton distribution parametrizations. © 2002 The American Physical Society. |
| first_indexed | 2024-03-07T06:16:29Z |
| format | Journal article |
| id | oxford-uuid:f13ffb8b-1a8c-4403-bfab-ee9190d04ba2 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T06:16:29Z |
| publishDate | 2002 |
| record_format | dspace |
| spelling | oxford-uuid:f13ffb8b-1a8c-4403-bfab-ee9190d04ba22022-03-27T11:54:36ZComparison of the isolated direct photon cross sections in p(p)over-bar collisions at root s=1.8 TeV and root s=0.63 TeVJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:f13ffb8b-1a8c-4403-bfab-ee9190d04ba2EnglishSymplectic Elements at Oxford2002Acosta, DAffolder, TAkimoto, HAlbrow, MGAmbrose, DAmidei, DAnikeev, KAntos, JApollinari, GArisawa, TArtikov, AAsakawa, TAshmanskas, WAzfar, FAzzi-Bacchetta, PBacchetta, NBachacou, HBadgett, WBailey, Sde Barbaro, PBarbaro-Galtieri, ABarnes, VBarnett, BBaroiant, SBarone, MWe have measured the cross sections d2σ/d P Tdη) for production of isolated direct photons in pp̄ collisions at two different center-of-mass energies, 1.8 TeV and 0.63 TeV, using the Collider Detector at Fermilab. The normalization of both data sets agrees with the predictions of quantum chromodynamics for a photon transverse momentum (PT) of 25 GeV/c, but the shapes versus photon PT do not. These shape differences lead to a significant disagreement in the ratio of cross sections in the scaling variable xT(≡ 2PT/√s). This disagreement in the xT ratio is difficult to explain with conventional theoretical uncertainties such as scale dependence and parton distribution parametrizations. © 2002 The American Physical Society. |
| spellingShingle | Acosta, D Affolder, T Akimoto, H Albrow, MG Ambrose, D Amidei, D Anikeev, K Antos, J Apollinari, G Arisawa, T Artikov, A Asakawa, T Ashmanskas, W Azfar, F Azzi-Bacchetta, P Bacchetta, N Bachacou, H Badgett, W Bailey, S de Barbaro, P Barbaro-Galtieri, A Barnes, V Barnett, B Baroiant, S Barone, M Comparison of the isolated direct photon cross sections in p(p)over-bar collisions at root s=1.8 TeV and root s=0.63 TeV |
| title | Comparison of the isolated direct photon cross sections in p(p)over-bar collisions at root s=1.8 TeV and root s=0.63 TeV |
| title_full | Comparison of the isolated direct photon cross sections in p(p)over-bar collisions at root s=1.8 TeV and root s=0.63 TeV |
| title_fullStr | Comparison of the isolated direct photon cross sections in p(p)over-bar collisions at root s=1.8 TeV and root s=0.63 TeV |
| title_full_unstemmed | Comparison of the isolated direct photon cross sections in p(p)over-bar collisions at root s=1.8 TeV and root s=0.63 TeV |
| title_short | Comparison of the isolated direct photon cross sections in p(p)over-bar collisions at root s=1.8 TeV and root s=0.63 TeV |
| title_sort | comparison of the isolated direct photon cross sections in p p over bar collisions at root s 1 8 tev and root s 0 63 tev |
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