First measurement of the quark-to-photon fragmentation function

Buskulic, D.; Casper, D.; Bonis, I. De; Décamp, D.; Ghez, Ph.; Goy, C.; Lees, J. P.; Lucotte, A.; Minard, M.-N.; Odier, P.; Pietrzyk, B.; Ariztizabal, F.; Chmeissani, M.; Crespo, J.M.; Efthymiopoulos, I.; Fernández, E.; Fernández-Bosman, M.; Gaitan, V.; Garrido, Ll.; Martı́nez, M.; Orteu, S.; Pacheco, A.; Aranda, C. Padilla; Palla, F.; Pascual, Á.; Perlas, J. A.; Sanchez, F. J. Munoz; Teubert, F.; Colaleo, A.; Creanza, D.; Palma, M. De; Farilla, A.; Gelao, G.; Girone, M.; Iaselli, G.; Mäggi, G.; Maggi, M.; Marinelli, N.; Natali, S.; Nuzzo, S.; Ranieri, A.; Raso, G.; Romanò, F.; Ruggieri, F.; Selvaggi, G.; Silvestris, L.; Tempesta, P.; Zito, G.; Huang, X. T.; Lin, J.; Ouyang, Q.; Wang, T.; Xie, Y.; Xu, R.; Xue, She‐Sheng; Zhang, J.; Zhang, L.; Zhao, W.; Bonvicini, G.; Cattaneo, M.; Comas, P.; Coyle, P.; Drevermann, H.; Engelhardt, A.; Forty, R.; Frank, M.; Hagelberg, R.; Harvey, J.; Jacobsen, R.G.; Janot, P.; Jost, B.; Knobloch, J.; Lehraus, I.; Markou, C.; Martin, E. B.; Mató, P.; Meinhard, H.; Minten, A.; Miquel, R.; Oest, T.; Palazzi, P.; Pater, J. R.; Pusztaszeri, J. F.; Ranjard, F.; Rensing, P.; Rolandi, G.; Schlatter, D.; Schmelling, M.; Schneider, O.; Tejessy, W.; Tomalin, I. R.; Venturi, A.; Wachsmuth, H.; Wiedenmann, W.; Wildish, T.; Witzeling, W.; Wotschack, J.; Ajaltouni, Z.; Bardadin-Otwinowska, M.; Barrès, A.; Boyer, C.; Falvard, A.; Guicheney, C.; Henrard, P.; Jousset, J.; Michel, B.; Monteil, S.; Montret, J. C.; Pallin, D.; Perret, P.; Podlyski, F.; Proriol, J.; Rossignol, J. M.; Saadi, F.; Fearnley, T.; Hansen, J. B.; Hansen, J. R.; Hansen, P.; Nilsson, B.S.; Kyriakis, A.; Simopoulou, E.; Siotis, I.; Vayaki, A.; Zachariadou, K.; Blondel, A.; Bonneaud, G. R.; Brient, J. C.; Bourdon, P.; Passalacqua, L.; Rougé, A.; Rumpf, M.; Tanaka, R.; Valassi, A.; Verderi, M.; Videau, H.; Candlin, D. J.; Parsons, M. I.; Focardi, E.; Parrini, G.; Corden, M.; Delfino, M.; Georgiopoulos, C.; Jaffe, D. E.; Antonelli, A.; Bencivenni, G.; Bologna, G.; Bossi, F.; Campana, P.; Capon, G.; Chiarella, V.; Felici, G.; Laurelli, P.; Mannocchi, G.; Murtas, F.; Murtas, F.; Pepe-Altarelli, M.; Dorris, S. J.; Halley, A.W.; Have, I. ten; Knowles, I. G.; Lynch, J.G.; Morton, W. T.; O’Shea, V.; Raine, C.; Reeves, P.; Scarr, J. M.; Smith, K. M.; Smith, M. G.; Thompson, A. S.; Thomson, F.; Thorn, S.; Turnbull, R.M.; Becker, U.; Braun, O.; Geweniger, C.; Graefe, G.; Hanke, P.; Hepp, V.; Kluge, E.-E.; Putzer, A.; Rensch, B.; Schmidt, M.; Sommer, J.; Stenzel, H.; Tittel, K.; Werner, S.; Wunsch, M.; Beuselinck, R.; Binnie, D. M.; Cameron, W.; Colling, D.; Dornan, P. J.; Konstantinidis, N.; Moneta, L.; Moutoussi, A.; Nash, J.; Martin, G.; Sedgbeer, J. K.; Stacey, A. M.; Dissertori, G.; Girtler, P.; Kneringer, E.; Kühn, D.; Rudolph, G.; Bowdery, C. K.; Brodbeck, T. J.; Colrain, P.; Crawford, G.; Finch, A. J.; Foster, F.; Hughes, G.; Sloan, T.; Whelan, E. P.; Williams, M.I.; Galla, A.; Greene, A. M.; Kleinknecht, K.; Quast, G.; Raab, J.; Renk, B.; Sander, H. G.; Wanke, R.; Zeitnitz, C.; Aubert, J.J.; Bencheikh, A. M.; Bencheikh, C.; Benchouk, C.; Bonissent, A.; Bujosa, G.; Calvet, D.; Carr, J.; Diaconu, C.; Etienne, F.; Thulasidas, M.; Nicod, D.; Payre, P.; Rousseau, D.; Talby, M.; Abt, I.; Assmann, R.; Bauer, C.; Blum, W.; Brown, D. N.; Dietl, H.; Dydak, F.; Ganis, G.; Gotzhein, C.; Jakobs, K.; Kroha, H.; Lütjens, G.; Lütz, G.; Männer, W.; Guenther, J.; Richter, R.; Rosado-Schlosser, A.; Schael, S.; Settles, R.; Seywerd, H.; Stierlin, U.; Denis, R. St.; Wolf, G.; Alemany, R.; Boucrot, J.; Callot, O.; Cordier, A.; Courault, F.; Davier, M.; Duflot, L.; Grivaz, J.-F.; Heusse, P.; Jacquet, M.; Kim, D. W.; Diberder, F. Le; Lefrançois, J.; Lutz, A.M.; Musolino, G.; Nikolić, Irena; Park, H. J.; Park, I. C.; Schune, M. H.; Simion, S.; Veillet, J. J.; Videau, I.; Abbaneo, D.; Azzurri, P.; Bagliesi, G.; Batignani, G.; Bettarini, S.; Bozzi, C.; Calderini, G.; Carpinelli, M.; Ciocci, M. A.; Ciulli, V.; Dell’Orso, R.; Fantechi, R.; Ferrante, I.; Foà, L.; Forti, F.; Giassi, A.; Giorgi, M. A.; Gregorio, A.; Ligabue, F.; Lusiani, A.; Marrocchesi, P. S.; Messineo, A.; Rizzo, G.; Sanguinetti, G.; Sciabà, A.; Spagnolo, P.; Steinberger, J.; Тенчини, Р.; Tonelli, G.; Triggiani, G.; Vannini, C.; Verdini, P. G.; Walsh, J.; Betteridge, A. P.; Blair, G.A.; Bryant, L. M.; Cerutti, F.; Green, M. G.; Johnson, D.; Medcalf, T.; Mir, L. M.; Perrodo, P.; Strong, J. A.; Bertín, V.; Botterill, D.; Clifft, R. W.; Edgecock, R.; Haywood, S. J.; Edwards, M.; Maley, P.; Norton, P. R.; Thompson, J.C.; Bloch-Devaux, B.; Colas, P.; Duarte, H.; Emery, S.; Kozanecki, W.; Lançon, E.; Lemaire, M. C.; Locci, E.; Marx, B.; Pérez, P.; Rander, J.; Renardy, J. F.; Rosowsky, A.; Roussarie, A.; Schuller, J. P.; Schwindling, J.; Mohand, D. Si; Trabelsi, A.; Vallage, B.; Johnson, R.P.; Kim, H. Y.; Litke, A. M.; McNeil, M.A.; Taylor, G. N.; Beddall, A.; Booth, C. N.; Boswell, Rod; Cartwright, S.; Combley, F.; Dawson, I.; Koksal, A.; Letho, M.; Newton, W. M.; Rankin, C.; Thompson, L.F.; Böhrer, A.; Brandt, Siegmund; Cowan, G.; Feigl, Eric O.; Grupen, C.; Lutters, G.; Minguet-Rodriguez, J.; Rivera, F.; Saraiva, Pedro; Smolík, L.; Stephan, F.; Apollonio, M.; Bosisio, L.; Marina, R. Della; Giannini, G.; Gobbo, B.; Ragusa, F.; Rothberg, J.; Wasserbaech, S.; Armstrong, S.R.; Bellantoni, L.; Elmer, P.; Feng, Z.; Ferguson, D.P.S.; Gao, Y. S.; González, S.; Grahl, J.; Harton, J. L.; Hayes, O.J.; Hu, H.; McNamara, Peter; Nachtman, J. M.; Orejudos, W.; Pan, Y. B.; Saadi, Y.; Schmitt, M.; Scott, I.; Sharma, V.; Turk, J. D.; Walsh, A. M.; Wu, S. L.; Wu, X.; Yamartino, J. M.; Zheng, M.; Zobernig, G.

doi:10.1007/bf02907417

Cited by 34 publications

(49 citation statements)

References 31 publications

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“…f O 8 3 S 1 z is proportional to D q x; m , which has been measured at LEP [17]. It turns out that numerically f O 8 3 S 1 z C 8 3 S 1 z in the central region.…”

mentioning

confidence: 63%

Radiative Decays and the Nature of Heavy Quarkonia

Tormo

Soto

2006

Phys. Rev. Lett.

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We argue that the photon spectra in radiative decays of various heavy quarkonium states provide important information on their nature. If two of these states are in the strong coupling regime, we are able to produce a parameter-free model-independent formula, which holds at next-to-leading order and includes both direct and fragmentation contributions. When the formula is checked against recent CLEO data it favors 2S and 3S in the strong coupling regime and disfavors 1S in it. DOI: 10.1103/PhysRevLett.96.111801 PACS numbers: 13.20.Gd, 12.39.St Heavy quarkonium systems have played a major role in our understanding of QCD (see [1] for a review). Inclusive heavy quarkonium decays to light particles involve a short distance process, in which the heavy quark and antiquark annihilate into gluons or photons, and a long distance process, which takes into account that the heavy quark and antiquark are bound in a color singlet state. Because of the asymptotic freedom of QCD the short distance process can be calculated using perturbation theory in s m , m being the heavy quark mass. It was believed for some time that in order to have a color singlet state the heavy quark and antiquark in it had to be in a color singlet state themselves. This allowed us to parameterize the long distance process by a wave function at the origin (or derivatives of it). In spite of the fact that this wave function was not computable from perturbative QCD (pQCD), it canceled in suitable ratios, and hence predictions depending on pQCD only could be put forward. Nevertheless, it was soon noticed that the above framework had difficulties due to the infrared divergences which showed up at higher orders of s m [2]. The introduction of color octet operators in the framework of nonrelativistic QCD (NRQCD) [3] provided a rigorous way to understand and to deal with these divergences [4]. The price to be paid was the introduction of new nonperturbative parameters, the color octet matrix elements, which made predictions depending on pQCD only more difficult to obtain.Later on, it was pointed out that of the hierarchy of relevant scales in heavy quarkonium m mv mv 2 , v being the relative velocity, only the first inequality was exploited in NRQCD and that the velocity counting proposed in [3] did not necessarily follow from it. It was also shown how the last inequality could be exploited by constructing a further effective theory, namely, potential NRQCD (pNRQCD) [5,6](see [7] for a review). The interplay of QCD with the scales mv and mv 2 above dictates the degrees of freedom of pNRQCD. Two regimes have been identified: (i) the weak coupling regime, QCD & mv 2 , and (ii) the strong coupling regime mv 2 QCD & mv. In the weak coupling regime, the relevant degrees of freedom are a singlet and an octet wave function fields interacting with (perturbative) potentials and with ultrasoft gluons. The original NRQCD counting [3] belongs to this regime. Moreover, the use of diagrammatic and quantum mechanical methods allows us to carry out explicit calculations ...

show abstract

“…f O 8 3 S 1 z is proportional to D q x; m , which has been measured at LEP [17]. It turns out that numerically f O 8 3 S 1 z C 8 3 S 1 z in the central region.…”

mentioning

confidence: 63%

Radiative Decays and the Nature of Heavy Quarkonia

Tormo

Soto

2006

Phys. Rev. Lett.

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“…Since this does not completely remove the quark-photon collinear singularity, the theoretical calculation of the QQ component will depend on the choice of the quark-tophoton fragmentation function D γ/Q ′ (z, µ f ). For this, we use the LO fragmentation function determined by the ALEPH Collaboration [29], parametrized by…”

Section: Zeus Experimental Cuts and Photon Isolationmentioning

confidence: 99%

CT14QED parton distribution functions from isolated photon production in deep inelastic scattering

et al. 2016

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We describe the implementation of Quantum Electrodynamic (QED) evolution at Leading Order (LO) along with Quantum Chromodynamic (QCD) evolution at Next-to-Leading Order (NLO) in the CTEQ-TEA Global analysis package. The inelastic contribution to the photon Parton Distribution Function (PDF) is described by a two-parameter ansatz, coming from radiation off the valence quarks, and based on the CT14 NLO PDFs. Setting the two parameters to be equal allows us to completely specify the inelastic photon PDF in terms of the inelastic momentum fraction carried by the photon, p γ 0 , at the initial scale Q 0 = 1.295 GeV. We obtain constraints on the photon PDF by comparing with ZEUS data [10] on the production of isolated photons in deep inelastic scattering, ep → eγ + X. For this comparison we present a new perturbative calculation of the process that consistently combines the photon-initiated contribution with the quark-initiated contribution. Comparison with the data allows us to put a constraint at the 90% confidence level of p γ 0 0.14% for the inelastic photon PDF at the initial scale of Q 0 = 1.295 GeV in the oneparameter radiative ansatz. The resulting inelastic CT14QED PDFs will be made available to the public. In addition, we also provide CT14QEDinc PDFs, in which the inclusive photon PDF at the scale Q 0 is defined by the sum of the inelastic photon PDF and the elastic photon distribution obtained from the Equivalent Photon Approximation.

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“…The production of fragmentation photons in hadronic collisions is completely encoded in the parton-tophoton FFs, D γ/k (z, µ f f ) obtained from fits [11,40] to photon production data at LEP (e + e − → qq(g) → γX) [41]. In jetphox two choices of FFs are available: the BFG set I ("small gluon") and II ("large gluon") [11].…”

Section: Dependence On the Parton-to-photon Fragmentation Functionmentioning

confidence: 99%

Sensitivity of isolated photon production at TeV hadron colliders to the gluon distribution in the proton

Ichou

d’Enterria

2010

Phys. Rev. D

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We compare the single inclusive spectra of isolated photons measured at high transverse energy in proton-antiproton collisions at √ s = 1.96 TeV with next-to-leading order perturbative QCD predictions with various parametrizations of the parton distribution functions (PDFs). Within the experimental and theoretical uncertainties, the Tevatron data can be reproduced equally well by the recent CTEQ6.6, MSTW08 and NNPDF1.2 PDF sets. We present also the predictions for isolated γ spectra in proton-proton collisions at √ s = 14 TeV for central (y = 0) and forward (y = 4) rapidities relevant for LHC experiments. Different proton PDFs result in maximum variations of order ±30% in the expected E γ T -differential isolated γ cross sections. The inclusion of the isolated photon data in global PDF fits will place extra independent constraints on the gluon density.

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First measurement of the quark-to-photon fragmentation function

Cited by 34 publications

References 31 publications

Radiative Decays and the Nature of Heavy Quarkonia

Radiative Decays and the Nature of Heavy Quarkonia

CT14QED parton distribution functions from isolated photon production in deep inelastic scattering

Sensitivity of isolated photon production at TeV hadron colliders to the gluon distribution in the proton

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