Measurement of the proton structure function F2 at very low Q2 at HERA

Breitweg, J.; Chekanov, S.; Derrick, M.; Krakauer, D.; Magill, S.; Musgrave, B.; Pellegrino, A.; Repond, J.; Stanek, R. W.; Yoshida, R.; Mattingly, M.C.K.; Abbiendi, G.; Anselmo, F.; Antonioli, P.; Bari, G.; Basile, M.; Bellagamba, L.; Boscherini, D.; Bruni, A.; Bruni, G.; Romeo, G. Cara; Castellini, G.; Cifarelli, L.; Cindolo, F.; Contin, A.; Coppola, N.; Corradi, M.; Pasquale, S. De; Giusti, P.; Iacobucci, G.; Laurenti, G.; Levi, G.; Margotti, A.; Massam, T.; Nania, R.; Palmonari, F.; Pesci, A.; Polini, A.; Sartorelli, G.; Garcia, Y. Zamora; Zichichi, A.; Amelung, C.; Bornheim, A.; Brock, I.; Coböken, K.; Crittenden, J.; Deffner, R.; Hartmann, H.; Héinloth, K.; Hilger, E.; Irrgang, P.; Jakob, H.‐P.; Kappes, A.; Katz, U.; Kerger, R.; Paul, E.; Schnurbusch, H.; Stifutkin, A.; Tandler, J.; Voss, K.; Weber, A.; Wieber, H.; Bailey, D. C.; Barret, O.; Brook, N. H.; Foster, B.; Heath, G. P.; Heath, H. F.; McFall, J.D.; Piccioni, David; Rodrigues, E.; Scott, J.; Tapper, R. J.; Capua, M.; Mastroberardino, A.; Schioppa, M.; Susinno, G.; Jeoung, Haeseong; Kim, J.Y.; Lee, J.H.; Lim, I. T.; Ma, K.J.; Pac, M. Y.; Caldwell, A.; Liu, W.; Liu, X.; Mellado, B.; Paganis, E.; Sampson, Scott E.; Schmidke, W. B.; Sciulli, F.; Chwastowski, J. J.; Eskreys, A.; Figiel, J.; Klimek, K.; Olkiewicz, K.; Piotrzkowski, K.; Przybycień, M.; Stopa, P.; Zawiejski, L.; Bednarek, B.; Jeleń, K.; Kisielewska, D.; Kowal, A.M.; Kowalski, T.; Przybycień, M.; Rulikowska-Zarȩbska, E.; Suszycki, L.; Szuba, D.; Kotański, A.; Bauerdick, L. A. T.; Behrens, U.; Bienlein, J. K.; Burgard, C.; Dannheim, D.; Desler, K.; Drews, G.; Fox-Murphy, A.; Fricke, U.; Göebel, F.; Göttlicher, P.; Graciani, R.; Haas, T.; Hain, W.; Hartner, G.; Hasell, D.; Hebbel, K.; Johnson, K. F.; Kasemann, M.; Koch, W.; Kötz, U.; Kowalski, H.; Lindemann, Lars; Löhr, B.; Martínez, M. Lucio; Milite, M.; Monteiro, T.; Moritz, M.; Notz, D.; Pelucchi, F.; Petrucci, M.C.; Rohde, M.; Saull, P. R. B.; Savin, A.A.; Schneekloth, U.; Selonke, F.; Sievers, Michael; Stonjek, S.; Tassi, E.; Wolf, G.; Wollmer, U.; Youngman, C.; Zeuner, Wolfram Dietrich; Coldewey, C.; Viani, A. Lopez-Duran; Meyer, Andreas Bernhard; Schlenstedt, S.; Straub, P.B.; Barbagli, G.; Gallo, E.; Pelfer, P. G.; Maccarrone, G.; Votano, L.; Bamberger, A.; Benen, A.; Eisenhardt, S.; Markun, P.; Raach, H.; Wölfle, S.; Bussey, P.; Bell, M. A.; Doyle, A. T.; Lee, S.W.; Lupi, A.; Macdonald, N.; McCance, Gavin; Saxon, D. H.; Sinclair, L.E.; Skillicorn, I. O.; Waugh, R.; Bohnet, I.; Gendner, N.; Holm, U.; Meyer-Larsen, A.; Salehi, H.; Wick, K.; Garfagnini, A.; Gialas, I.; Gladilin, L. K.; Kçira, D.; Klanner, R.; Lohrmann, E.; Poelz, G.; Zetsche, Frank; Gonçalo, R.; Long, K.; Miller, D. B.; Tapper, A.; Walker, R.; Mallik, U.; Cloth, P.; Filges, D.; Ishii, T.; Kuze, M.; Nagano, K.; Tokushuku, K.; Yamada, Shoichi; Yamazaki, Y.; Ahn, S. H.; Lee, S.B.; Park, S.K.; Lim, H.; Park, I.H.; Son, D.; Barreiro, F.; Garcı́a, G.; Glasman, C.; González, O.; Labarga, L.; Peso, J. Del; Redondo, I.; Terrón, J.; Barbi, M.; Corriveau, F.; Hanna, D.; Ochs, A.; Padhi, S.; Riveline, M.; Stairs, D. G.; Wing, M.; Tsurugai, T.; Антонов, А.; Bashkirov, V.; Danilov, M.; Dolgoshein, B. A.; Gladkov, D.; Sosnovtsev, V.; Suchkov, S.; Dementiev, R. K.; Ermolov, P.; Golubkov, Yu. A.; Katkov, I.; Khein, Lev; Korotkova, N.; Korzhavina, I. A.; Kuzmin, V. A.; Lukina, O. Yu.; Proskuryakov, A.S.; Shcheglova, L.M.; Solomin, A.; Vlasov, N.; Zotkin, S. A.; Bokel, C.H.; Botje, M.; Brümmer, N.; Engelen, J.; Grijpink, S.J.L.A.; Koffeman, E.; Kooijman, P.; Schagen, S.E.S.; Sighem, Ard van; Tiecke, H.; Tuning, N.; Velthuis, J. J.; Vossebeld, J. H.; Wiggers, L.; Wolf, E. de; Acosta, D.; Bylsma, B.; Durkin, L. S.; Gilmore, J.; Ginsburg, C. M.; Kim, C.L.; Ling, T. Y.; Boogert, Stewart; Cooper-Sarkar, A.M.; Devenish, R.C.E.; Große-Knetter, J.; Matsushita, T.; Quadt, A.; Ruske, O.; Sutton, M. R.; Walczak, R.; Bertolin, A.; Brugnera, R.; Carlin, R.; Corso, F. Dal; Dosselli, U.; Dusini, S.; Limentani, S.; Morandin, M.; Posocco, M.; Stančo, L.; Stroili, R.; Turcato, M.; Voci, C.; Adamczyk, L.; Iannotti, L.; Oh, B.Y.; Okrasiński, J.R.; Toothacker, W. S.; Whitmore, J. J.; Iga, Y.; D’Agostini, G.; Marini, G.; Nigro, A.; Cormack, C. M.; Hart, J. C.; McCubbin, N. A.; Shah, T.; Epperson, D.; Heusch, C. A.; Sadrozinski, H. F-W.; Seiden, A.; Wichmann, R.; Williams, Daniel C.; Pavel, N.; Abramowicz, H.; Dagan, S.; Kananov, S.; Kreisel, A.; Levy, A.; Abe, T.; Fusayasu, T.; Umemori, Kensei; Yamashita, T.; Hamatsu, R.; Hirose, T.; Inuzuka, M.; Kitamura, S.; Nishimura, T.; Arneodo, M.; Cartiglia, N.; Cirio, R.; Costa, M.; Ferrero, M. I.; Maselli, S.; Monaco, V.; Peroni, C.; Ruspa, M.; Sacchi, R.; Solano, A.; Staiano, A.; Dardo, M.; Bailey, D. C.; Fagerstroem, C.-P.; Galea, R.; Koop, T.; Levman, G.; Martin, J. F.; Orr, R. S.; Polenz, S.; Sabetfakhri, A.; Simmons, D.; Butterworth, J. M.; Hayes, M. E.; Heaphy, E.A.; Jones, T. W.; Lane, J.B.; West, B.J.; Ciborowski, J.; Ciesielski, R.; Grzelak, G.; Nowak, R. J.; Pawlak, J. M.; Pawlak, R.; Smalska, B.; Tymieniecka, T.; Wróblewski, A.; Zakrzewski, J.; Żarnecki, A.F.; Adamus, M.; Gadaj, T.; Deppe, O.; Eisenberg, Y.; Hochman, D.; Karshon, U.; Badgett, W.; Chapin, D.; Cross, R.; Foudas, C.; Mattingly, S. E.K.; Reeder, D.; Smith, W. H.; Vaiciulis, A.; Wildschek, T.; Wodarczyk, M.; Deshpande, A.; Dhawan, S.; Hughes, V. W.; Bhadra, S.; Catterall, C. D.; Cole, J. E.; Frisken, W. R.; Hall-Wilton, R.; Khakzad, M.; Menary, S.

doi:10.1016/s0370-2693(00)00793-0

Cited by 172 publications

(87 citation statements)

References 48 publications

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“…Using a new Froissart-bounded parametrization of the DIS structure function F γp 2 , we have fitted the the experimental HERA results on DIS [1][2][3][4] in the region x ≤ 0.1 and 0.1 ≤ Q 2 ≤ 5000 GeV 2 , restricted to virtual γ * p center-of-mass energies W ≥ 25 GeV. We have used the results to calculate the cross section σ γ * p (W, Q 2 ) for virtual γ * p scattering, and connected it to the known Froissart-bounded high energy cross section for real γp scattering.…”

Section: Discussionmentioning

confidence: 99%

“…The measurements of the ZEUS [1][2][3] and H1 [4] detector groups covered the range 10 −6 x 0.1, with values of Q 2 = −q 2 in the range of 0.1 GeV 2 to 5000 GeV 2 , and determined the DIS structure function F γp 2 accurately in this region. This process can be viewed quite usefully as the scattering of a virtual photon γ * emitted by the electron on the target proton with Q 2 , the negative (mass) 2 of the virtual photon, a measure of the virtuality of the process.…”

Section: Introductionmentioning

confidence: 99%

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Connection of the virtualγ*pcross section ofepdeep inelastic scattering to realγ<

2014

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Connection of the virtualγ*pcross section ofepdeep inelastic scattering to realγ<

2014

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“…Recent measurements of the SF have become available, from H1 [24] and ZEUS [25] collaborations ; they complete or correct the previous data near the HERA collider [26]- [29] and [30]- [32] and from fixed target experiments [33]- [37]. They have motivated us to test and compare above mentioned Pomeron models of the proton structure function F 2 (x, Q 2 ) for the widest region of Q 2 and x.…”

Section: Introductionmentioning

confidence: 94%

Regge models of the proton structure function with and without hard pomeron: A comparative analysis

Desgrolard¹,

Martynov²

2001

Eur. Phys. J. C

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A comparative phenomenological analysis of Regge models with and without a hard Pomeron component is performed using a common set of recently updated data. It is shown that the data at small x do not indicate explicitly the presence of the hard Pomeron. Moreover, the models with two soft-Pomeron components (simple and double poles in the angular momentum plane) with trajectories having intercept equal one lead to the best description of the data not only at W > 3 GeV and at small x but also at all x ≤ 0.75 and Q 2 ≤ 30000 GeV 2 .

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“…I perform a fit to H1 [29], ZEUS [30,31] and E665 [32] data for x < 0.01 and 0.5GeV 2 ≤ Q 2 ≤ 50GeV 2 . The last of these is important since it constrains the x-shape of the structure function, and hence dipole cross-section, at low Q 2 where the HERA data cover only a relatively narrow range in x.…”

Section: Details Of the Fitmentioning

confidence: 99%

Gluon distributions and fits using dipole cross sections

Thorne

2005

Phys. Rev. D

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I investigate the relationship between the gluon distribution obtained using a dipole model fit to low-x data on F 2 (x, Q 2 ) and standard gluons obtained from global fits with the collinear factorization theorem at fixed order. I stress the necessity to do fits of this type carefully, and in particular to include the contribution from heavy flavours to the inclusive structure function. I find that the dipole cross-section must be rather steeper than the gluon distribution, which at least partially explains why dipole model fits produce dipole cross-sections growing quite strongly at small x, while DGLAP based fits have valence-like, or even negative, small-x gluons as inputs. However, I also find that the gluon distributions obtained from the dipole fits are much too small to match onto the conventional DGLAP gluons at high Q 2 ∼ 50GeV 2 , where the two approaches should coincide. The main reason for this discrepancy is found to be the large approximations made in converting the dipole cross-sections into structure functions using formulae which are designed only for asymptotically small x. The shortcomings in this step affect the accuracy of the extracted dipole cross-sections in terms of size and shape, and hence also in terms of interpretation, at all scales.

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Measurement of the proton structure function F2 at very low Q2 at HERA

Cited by 172 publications

References 48 publications

Connection of the virtualγ*pcross section ofepdeep inelastic scattering to realγ<

Connection of the virtualγ*pcross section ofepdeep inelastic scattering to realγ<

Regge models of the proton structure function with and without hard pomeron: A comparative analysis

Gluon distributions and fits using dipole cross sections

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