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; T. Arisawa; A. Artikov; T. Asakawa; W. Ashmanskas; F. Azfar; P. Azzi-Bacchetta; N. Bacchetta; H. Bachacou; W. Badgett; S. Bailey; P. De Barbaro; 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

doi: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

D. Acosta, T. Affolder, H. Akimoto, M. G. Albrow, D. Ambrose, D. Amidei, K. Anikeev, J. Antos, G. Apollinari, T. Arisawa, A. Artikov, T. Asakawa, W. Ashmanskas, F. Azfar, P. Azzi-Bacchetta, N. Bacchetta, H. Bachacou, W. Badgett, S. Bailey, P. De BarbaroA. 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

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Abstract

We have measured the cross sections d²σ/d P _Td_η) 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 (P_T) of 25 GeV/c, but the shapes versus photon P_T do not. These shape differences lead to a significant disagreement in the ratio of cross sections in the scaling variable x^T(≡ 2P_T/√s). This disagreement in the x_T ratio is difficult to explain with conventional theoretical uncertainties such as scale dependence and parton distribution parametrizations.

Original language	English (US)
Article number	112003
Journal	Physical Review D
Volume	65
Issue number	11
DOIs	https://doi.org/10.1103/PhysRevD.65.112003
State	Published - 2002
Externally published	Yes

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1103/PhysRevD.65.112003

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Acosta, D., Affolder, T., Akimoto, H., Albrow, M. G., 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., ... 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), Article 112003. https://doi.org/10.1103/PhysRevD.65.112003

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

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title = "Comparison of the isolated direct photon cross sections in p{\=p} collisions at √s = 1.8 TeV and √s = 0.63 TeV",

abstract = "We have measured the cross sections d2σ/d P Tdη) for production of isolated direct photons in p{\=p} 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.",

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

year = "2002",

doi = "10.1103/PhysRevD.65.112003",

language = "English (US)",

volume = "65",

journal = "Physical Review D",

issn = "0556-2821",

publisher = "American Institute of Physics",

number = "11",

}

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, T.

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.

UR - http://www.scopus.com/inward/record.url?scp=0036612701&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0036612701&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.65.112003

DO - 10.1103/PhysRevD.65.112003

M3 - Article

AN - SCOPUS:0036612701

SN - 0556-2821

VL - 65

JO - Physical Review D

JF - Physical Review D

IS - 11

M1 - 112003

ER -

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

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