Comparison of the isolated direct photon cross sections in pp̄ collisions at √s = 1.8 TeV and √s = 0.63 TeV

D. Acosta, T. Affolder, H. Akimoto, M. G. Albrow, D. Ambrose, D. Amidei, K. Anikeev, J. Antos, G. Apollinari, Tetsuo Arisawa, A. Artikov, T. Asakawa, W. Ashmanskas, F. Azfar, P. Azzi-Bacchetta, N. Bacchetta, H. Bachacou, W. Badgett, S. Bailey, P. De Barbaro & 79 others A. Barbaro-Galtieri, V. E. Barnes, B. A. Barnett, S. Baroiant, M. Barone, G. Bauer, F. Bedeschi, S. Belforte, W. H. Bell, G. Bellettini, J. Bellinger, D. Benjamin, J. Bensinger, A. Beretvas, J. P. Berge, J. Berryhill, A. Bhatti, M. Binkley, D. Bisello, M. Bishai, R. E. Blair, C. Blocker, K. Bloom, B. Blumenfeld, S. R. Blusk, A. Bocci, A. Bodek, G. Bolla, Y. Bonushkin, D. Bortoletto, J. Boudreau, A. Brandl, S. Van Den Brink, C. Bromberg, M. Brozovic, E. Brubaker, N. Bruner, J. Budagov, H. S. Budd, K. Burkett, G. Busetto, A. Byon-Wagner, K. L. Byrum, S. Cabrera, P. Calafiura, M. Campbell, W. Carithers, J. Carlson, D. Carlsmith, W. Caskey, A. Castro, D. Cauz, A. Cerri, A. W. Chan, P. S. Chang, P. T. Chang, J. Chapman, C. Chen, Y. C. Chen, M. T. Cheng, M. Chertok, G. Chiarelli, I. Chirikov-Zorin, G. Chlachidze, F. Chlebana, L. Christofek, M. L. Chu, J. Y. Chung, W. H. Chung, Y. S. Chung, C. I. Ciobanu, A. G. Clark, M. Coca, A. P. Colijn, A. Connolly, M. Convery, J. Conway, M. Cordelli, J. Cranshaw

Research output: Contribution to journalArticle

64 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number112003
JournalPhysical Review D
Volume65
Issue number11
DOIs
Publication statusPublished - 2002

Fingerprint

Photon
Cross section
Collision
collisions
cross sections
photons
transverse momentum
Transverse
Momentum
Barycentre
Parametrization
partons
Normalization
center of mass
quantum chromodynamics
Detector
Scaling
Uncertainty
scaling
Prediction

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics
  • Mathematical Physics

Cite this

Acosta, D., Affolder, T., Akimoto, H., Albrow, M. G., Ambrose, D., Amidei, D., ... Cranshaw, J. (2002). Comparison of the isolated direct photon cross sections in pp̄ collisions at √s = 1.8 TeV and √s = 0.63 TeV. Physical Review D, 65(11), [112003]. https://doi.org/10.1103/PhysRevD.65.112003

Comparison of the isolated direct photon cross sections in pp̄ collisions at √s = 1.8 TeV and √s = 0.63 TeV. / Acosta, D.; Affolder, T.; Akimoto, H.; Albrow, M. G.; Ambrose, D.; Amidei, D.; Anikeev, K.; Antos, J.; Apollinari, G.; Arisawa, Tetsuo; 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. E.; Barnett, B. A.; Baroiant, S.; Barone, M.; Bauer, G.; Bedeschi, F.; Belforte, S.; Bell, W. H.; Bellettini, G.; Bellinger, J.; Benjamin, D.; Bensinger, J.; Beretvas, A.; Berge, J. P.; Berryhill, J.; Bhatti, A.; Binkley, M.; Bisello, D.; Bishai, M.; Blair, R. E.; Blocker, C.; Bloom, K.; Blumenfeld, B.; Blusk, S. R.; Bocci, A.; Bodek, A.; Bolla, G.; Bonushkin, Y.; Bortoletto, D.; Boudreau, J.; Brandl, A.; Van Den Brink, S.; Bromberg, C.; Brozovic, M.; Brubaker, E.; Bruner, N.; Budagov, J.; Budd, H. S.; Burkett, K.; Busetto, G.; Byon-Wagner, A.; Byrum, K. L.; Cabrera, S.; Calafiura, P.; Campbell, M.; Carithers, W.; Carlson, J.; Carlsmith, D.; Caskey, W.; Castro, A.; Cauz, D.; Cerri, A.; Chan, A. W.; Chang, P. S.; Chang, P. T.; Chapman, J.; Chen, C.; Chen, Y. C.; Cheng, M. T.; Chertok, M.; Chiarelli, G.; Chirikov-Zorin, I.; Chlachidze, G.; Chlebana, F.; Christofek, L.; Chu, M. L.; Chung, J. Y.; Chung, W. H.; Chung, Y. S.; Ciobanu, C. I.; Clark, A. G.; Coca, M.; Colijn, A. P.; Connolly, A.; Convery, M.; Conway, J.; Cordelli, M.; Cranshaw, J.

In: Physical Review D, Vol. 65, No. 11, 112003, 2002.

Research output: Contribution to journalArticle

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, VE, Barnett, BA, Baroiant, S, Barone, M, Bauer, G, Bedeschi, F, Belforte, S, Bell, WH, Bellettini, G, Bellinger, J, Benjamin, D, Bensinger, J, Beretvas, A, Berge, JP, Berryhill, J, Bhatti, A, Binkley, M, Bisello, D, Bishai, M, Blair, RE, Blocker, C, Bloom, K, Blumenfeld, B, Blusk, SR, Bocci, A, Bodek, A, Bolla, G, Bonushkin, Y, Bortoletto, D, Boudreau, J, Brandl, A, Van Den Brink, S, Bromberg, C, Brozovic, M, Brubaker, E, Bruner, N, Budagov, J, Budd, HS, Burkett, K, Busetto, G, Byon-Wagner, A, Byrum, KL, Cabrera, S, Calafiura, P, Campbell, M, Carithers, W, Carlson, J, Carlsmith, D, Caskey, W, Castro, A, Cauz, D, Cerri, A, Chan, AW, Chang, PS, Chang, PT, Chapman, J, Chen, C, Chen, YC, Cheng, MT, Chertok, M, Chiarelli, G, Chirikov-Zorin, I, Chlachidze, G, Chlebana, F, Christofek, L, Chu, ML, Chung, JY, Chung, WH, Chung, YS, Ciobanu, CI, Clark, AG, Coca, M, Colijn, AP, Connolly, A, Convery, M, Conway, J, Cordelli, M & Cranshaw, J 2002, 'Comparison of the isolated direct photon cross sections in pp̄ collisions at √s = 1.8 TeV and √s = 0.63 TeV', Physical Review D, vol. 65, no. 11, 112003. https://doi.org/10.1103/PhysRevD.65.112003
Acosta, D. ; Affolder, T. ; Akimoto, H. ; Albrow, M. G. ; Ambrose, D. ; Amidei, D. ; Anikeev, K. ; Antos, J. ; Apollinari, G. ; Arisawa, Tetsuo ; 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. E. ; Barnett, B. A. ; Baroiant, S. ; Barone, M. ; Bauer, G. ; Bedeschi, F. ; Belforte, S. ; Bell, W. H. ; Bellettini, G. ; Bellinger, J. ; Benjamin, D. ; Bensinger, J. ; Beretvas, A. ; Berge, J. P. ; Berryhill, J. ; Bhatti, A. ; Binkley, M. ; Bisello, D. ; Bishai, M. ; Blair, R. E. ; Blocker, C. ; Bloom, K. ; Blumenfeld, B. ; Blusk, S. R. ; Bocci, A. ; Bodek, A. ; Bolla, G. ; Bonushkin, Y. ; Bortoletto, D. ; Boudreau, J. ; Brandl, A. ; Van Den Brink, S. ; Bromberg, C. ; Brozovic, M. ; Brubaker, E. ; Bruner, N. ; Budagov, J. ; Budd, H. S. ; Burkett, K. ; Busetto, G. ; Byon-Wagner, A. ; Byrum, K. L. ; Cabrera, S. ; Calafiura, P. ; Campbell, M. ; Carithers, W. ; Carlson, J. ; Carlsmith, D. ; Caskey, W. ; Castro, A. ; Cauz, D. ; Cerri, A. ; Chan, A. W. ; Chang, P. S. ; Chang, P. T. ; Chapman, J. ; Chen, C. ; Chen, Y. C. ; Cheng, M. T. ; Chertok, M. ; Chiarelli, G. ; Chirikov-Zorin, I. ; Chlachidze, G. ; Chlebana, F. ; Christofek, L. ; Chu, M. L. ; Chung, J. Y. ; Chung, W. H. ; Chung, Y. S. ; Ciobanu, C. I. ; Clark, A. G. ; Coca, M. ; Colijn, A. P. ; Connolly, A. ; Convery, M. ; Conway, J. ; Cordelli, M. ; Cranshaw, J. / Comparison of the isolated direct photon cross sections in pp̄ collisions at √s = 1.8 TeV and √s = 0.63 TeV. In: Physical Review D. 2002 ; Vol. 65, No. 11.
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abstract = "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.",
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TY - JOUR

T1 - Comparison of the isolated direct photon cross sections in pp̄ collisions at √s = 1.8 TeV and √s = 0.63 TeV

AU - Acosta, D.

AU - Affolder, T.

AU - Akimoto, H.

AU - Albrow, M. G.

AU - Ambrose, D.

AU - Amidei, D.

AU - Anikeev, K.

AU - Antos, J.

AU - Apollinari, G.

AU - Arisawa, Tetsuo

AU - Artikov, A.

AU - Asakawa, T.

AU - Ashmanskas, W.

AU - Azfar, F.

AU - Azzi-Bacchetta, P.

AU - Bacchetta, N.

AU - Bachacou, H.

AU - Badgett, W.

AU - Bailey, S.

AU - De Barbaro, P.

AU - Barbaro-Galtieri, A.

AU - Barnes, V. E.

AU - Barnett, B. A.

AU - Baroiant, S.

AU - Barone, M.

AU - Bauer, G.

AU - Bedeschi, F.

AU - Belforte, S.

AU - Bell, W. H.

AU - Bellettini, G.

AU - Bellinger, J.

AU - Benjamin, D.

AU - Bensinger, J.

AU - Beretvas, A.

AU - Berge, J. P.

AU - Berryhill, J.

AU - Bhatti, A.

AU - Binkley, M.

AU - Bisello, D.

AU - Bishai, M.

AU - Blair, R. E.

AU - Blocker, C.

AU - Bloom, K.

AU - Blumenfeld, B.

AU - Blusk, S. R.

AU - Bocci, A.

AU - Bodek, A.

AU - Bolla, G.

AU - Bonushkin, Y.

AU - Bortoletto, D.

AU - Boudreau, J.

AU - Brandl, A.

AU - Van Den Brink, S.

AU - Bromberg, C.

AU - Brozovic, M.

AU - Brubaker, E.

AU - Bruner, N.

AU - Budagov, J.

AU - Budd, H. S.

AU - Burkett, K.

AU - Busetto, G.

AU - Byon-Wagner, A.

AU - Byrum, K. L.

AU - Cabrera, S.

AU - Calafiura, P.

AU - Campbell, M.

AU - Carithers, W.

AU - Carlson, J.

AU - Carlsmith, D.

AU - Caskey, W.

AU - Castro, A.

AU - Cauz, D.

AU - Cerri, A.

AU - Chan, A. W.

AU - Chang, P. S.

AU - Chang, P. T.

AU - Chapman, J.

AU - Chen, C.

AU - Chen, Y. C.

AU - Cheng, M. T.

AU - Chertok, M.

AU - Chiarelli, G.

AU - Chirikov-Zorin, I.

AU - Chlachidze, G.

AU - Chlebana, F.

AU - Christofek, L.

AU - Chu, M. L.

AU - Chung, J. Y.

AU - Chung, W. H.

AU - Chung, Y. S.

AU - Ciobanu, C. I.

AU - Clark, A. G.

AU - Coca, M.

AU - Colijn, A. P.

AU - Connolly, A.

AU - Convery, M.

AU - Conway, J.

AU - Cordelli, M.

AU - Cranshaw, J.

PY - 2002

Y1 - 2002

N2 - 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.

AB - 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.

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DO - 10.1103/PhysRevD.65.112003

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JO - Physical review D: Particles and fields

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SN - 0556-2821

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