Observation of exclusive γγ production in pp¯ collisions at √s=1.96 TeV.
We have observed exclusive γγ production in proton-antiproton collisions at √s=1.96 TeV, using data from 1.11±0.07 fb(-1) integrated luminosity taken by the Run II Collider Detector at Fermilab. We selected events with two electromagnetic showers, each with transverse energy E(T)>2.5 GeV and...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
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2012
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| _version_ | 1797099158912368640 |
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| author | Aaltonen, T Albrow, MG Alvarez González, B Amerio, S Amidei, D Anastassov, A Annovi, A Antos, J Apollinari, G Appel, J Arisawa, T Artikov, A Asaadi, J Ashmanskas, W Auerbach, B Aurisano, A Azfar, F Badgett, W Bae, T Barbaro-Galtieri, A Barnes, V Barnett, B Barria, P Bartos, P Bauce, M |
| author_facet | Aaltonen, T Albrow, MG Alvarez González, B Amerio, S Amidei, D Anastassov, A Annovi, A Antos, J Apollinari, G Appel, J Arisawa, T Artikov, A Asaadi, J Ashmanskas, W Auerbach, B Aurisano, A Azfar, F Badgett, W Bae, T Barbaro-Galtieri, A Barnes, V Barnett, B Barria, P Bartos, P Bauce, M |
| author_sort | Aaltonen, T |
| collection | OXFORD |
| description | We have observed exclusive γγ production in proton-antiproton collisions at √s=1.96 TeV, using data from 1.11±0.07 fb(-1) integrated luminosity taken by the Run II Collider Detector at Fermilab. We selected events with two electromagnetic showers, each with transverse energy E(T)>2.5 GeV and pseudorapidity |η|<1.0, with no other particles detected in -7.4<η<+7.4. The two showers have similar E(T) and azimuthal angle separation Δφ~π; 34 events have two charged particle tracks, consistent with the QED process pp¯→p+e(+)e(-)+p¯ by two-photon exchange, while 43 events have no charged tracks. The number of these events that are exclusive π(0)π(0) is consistent with zero and is <15 at 95% C.L. The cross section for pp¯→p+γγ+p¯ with |η(γ)|<1.0 and E(T)(γ)>2.5 GeV is 2.48(-0.35)(+0.40)(stat)(-0.51)(+0.40)(syst) pb. |
| first_indexed | 2024-03-07T05:19:42Z |
| format | Journal article |
| id | oxford-uuid:de738cd2-71cf-4b94-8264-31eca923b0a3 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T05:19:42Z |
| publishDate | 2012 |
| record_format | dspace |
| spelling | oxford-uuid:de738cd2-71cf-4b94-8264-31eca923b0a32022-03-27T09:32:25ZObservation of exclusive γγ production in pp¯ collisions at √s=1.96 TeV.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:de738cd2-71cf-4b94-8264-31eca923b0a3EnglishSymplectic Elements at Oxford2012Aaltonen, TAlbrow, MGAlvarez González, BAmerio, SAmidei, DAnastassov, AAnnovi, AAntos, JApollinari, GAppel, JArisawa, TArtikov, AAsaadi, JAshmanskas, WAuerbach, BAurisano, AAzfar, FBadgett, WBae, TBarbaro-Galtieri, ABarnes, VBarnett, BBarria, PBartos, PBauce, MWe have observed exclusive γγ production in proton-antiproton collisions at √s=1.96 TeV, using data from 1.11±0.07 fb(-1) integrated luminosity taken by the Run II Collider Detector at Fermilab. We selected events with two electromagnetic showers, each with transverse energy E(T)>2.5 GeV and pseudorapidity |η|<1.0, with no other particles detected in -7.4<η<+7.4. The two showers have similar E(T) and azimuthal angle separation Δφ~π; 34 events have two charged particle tracks, consistent with the QED process pp¯→p+e(+)e(-)+p¯ by two-photon exchange, while 43 events have no charged tracks. The number of these events that are exclusive π(0)π(0) is consistent with zero and is <15 at 95% C.L. The cross section for pp¯→p+γγ+p¯ with |η(γ)|<1.0 and E(T)(γ)>2.5 GeV is 2.48(-0.35)(+0.40)(stat)(-0.51)(+0.40)(syst) pb. |
| spellingShingle | Aaltonen, T Albrow, MG Alvarez González, B Amerio, S Amidei, D Anastassov, A Annovi, A Antos, J Apollinari, G Appel, J Arisawa, T Artikov, A Asaadi, J Ashmanskas, W Auerbach, B Aurisano, A Azfar, F Badgett, W Bae, T Barbaro-Galtieri, A Barnes, V Barnett, B Barria, P Bartos, P Bauce, M Observation of exclusive γγ production in pp¯ collisions at √s=1.96 TeV. |
| title | Observation of exclusive γγ production in pp¯ collisions at √s=1.96 TeV. |
| title_full | Observation of exclusive γγ production in pp¯ collisions at √s=1.96 TeV. |
| title_fullStr | Observation of exclusive γγ production in pp¯ collisions at √s=1.96 TeV. |
| title_full_unstemmed | Observation of exclusive γγ production in pp¯ collisions at √s=1.96 TeV. |
| title_short | Observation of exclusive γγ production in pp¯ collisions at √s=1.96 TeV. |
| title_sort | observation of exclusive γγ production in pp¯ collisions at √s 1 96 tev |
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