Combination and QCD analysis of charm and beauty production cross-section measurements in deep inelastic ep scattering at HERA

Abramowicz, H.; Abt, I.; Adamczyk, L.; Adamus, M.; Aggarwal, R.; Andreev, V.; Antonelli, S.; Aushev, V.; Baghdasaryan, A.; Begzsuren, K.; Behnke, O.; Behrens, U.; Belousov, A.; Bertolin, A.; Bloch, I.; Bolz, A. E.; Boudry, V.; Brandt, G.; Brisson, V.; Britzger, D.; Brock, I.; Brook, N. H.; Brugnera, R.; Bruni, A.; Buniatyan, A.; Bussey, P.; Bylinkin, A.; Bystritskaya, L.; Caldwell, A.; Campbell, A. J.; Avila, K. B. Cantun; Capua, M.; Catterall, C. D.; C̆erný, K.; Chekelian, V.; Chwastowski, J. J.; Ciborowski, J.; Ciesielski, R.; Contreras, J. G.; Cooper‐Sarkar, A. M.; Corradi, M.; Cvach, J.; Dainton, J. B.; Daum, K.; Dementiev, R. K.; Devenish, R. C. E.; Diaconu, C.; Dobre, M.; Dusini, S.; Eckerlin, G.; Egli, S.; Elsen, E.; Favart, L.; Fedotov, A.; Feltesse, J.; Fleischer, M.; Fomenko, A.; Foster, B.; Gallo, E.; Garfagnini, A.; Gayler, J.; Geiser, A.; Gizhko, A.; Gladilin, L. K.; Goerlich, L.; Gogitidze, N.; Golubkov, Yu. A.; Gouzevitch, M.; Grab, C.; Grebenyuk, A.; Greenshaw, T.; Grindhammer, G.; Grzelak, G.; Gwenlan, C.; Haidt, D.; Henderson, R. C. W.; Hladký, J.; Hlushchenko, O.; Hochman, D.; Hoffmann, D.; Horisberger, R.; Hreus, T.; Huber, Florian; Ibrahim, Zainol Abidin; Iga, Y.; Jacquet, M.; Janssen, X.; Jomhari, N. Z.; Jung, A. W.; Jung, H.; Каденко, І.; Kananov, S.; Kapichine, M.; Karshon, U.; Katzy, J.; Kaur, P.; Kiesling, C.; Kisielewska, D.; Klanner, R.; Klein, M.; Klein, U.; Kleinwort, C.; Kogler, R.; Korzhavina, I. A.; Kostka, P.; Kotański, A.; Kovalchuk, N.; Kowalski, H.; Kretzschmar, J.; Krücker, D.; Krüger, K.; Krupa, B.; Kuprash, O.; Kuze, M.; Landon, M. P. J.; Lange, W.; Laycock, P.; Lebedev, A.; Levchenko, B. B.; Levonian, S.; Levy, A.; Libov, V.; Lipka, K.; Lisovyi, M.; List, B.; List, Jenny; Łobodziński, B.; Löhr, B.; Lohrmann, E.; Longhin, A.; Lukina, O. Yu.; Makarenko, I.; Malinovski, E.; Malka, J.; Martyn, H. U.; Masciocchi, S.; Maxfield, S. J.; Mehta, A.; Meyer, Andreas Bernhard; Meyer, H.; Meyer, J.; Mikocki, S.; Idris, F. Mohamad; Nasir, N. Mohammad; Morozov, A.; Müller, K.; Myronenko, V.; Nagano, K.; Nam, J. D.; Naumann, T.; Newman, P. R.; Nicassio, M.; Niebuhr, C.; Nowak, G.; Olsson, J. E.; Onderwaater, J.; Onishchuk, Y.; Ozerov, D.; Pascaud, C.; Patel, G. D.; Paul, E.; Perez, E.; Perlański, W.; Petrukhin, A.; Pićurić, I.; Pirumov, H.; Pitzl, D.; Pokrovskiy, N. S.; Polifka, R.; Polini, A.; Przybycień, M.; Radescu, V.; Raičević, N.; Ravdandorj, T.; Reimer, P.; Rizvi, E.; Robmann, P.; Roosen, R.; Rostovtsev, A.; Rotaru, M.; Ruspa, M.; Šálek, D.; Sankey, D. P. C.; Sauter, M.; Sauvan, E.; Saxon, D. H.; Schioppa, M.; Schmitt, S.; Schneekloth, U.; Schoeffel, L.; Schöning, A.; Schörner-Sadenius, T.; Sefkow, F.; Selyuzhenkov, I.; Shcheglova, L.M.; Shushkevich, S.; Shyrma, Yu.O.; Skillicorn, I. O.; Słomiński, W.; Solano, A.; Soloviev, Y.; Sopicki, P.; South, D.; Spaskov, V.; Specka, A.; Stančo, L.; Steder, M.; Stefaniuk, N.; Stella, B.; Stern, A.; Stopa, P.; Straumann, U.; Surrow, B.; Sýkora, T.; Sztuk-Dambietz, J.; Tassi, E.; Thompson, P. D.; Tokushuku, K.; Tomaszewska, J.; Traynor, D.; Truöl, P.; Tsakov, I.; Tseepeldorj, B.; Tsurugai, T.; Turcato, M.; Turkot, O.; Tymieniecka, T.; Valkárová, A.; Vallée, C.; Mechelen, P. Van; Vazdik, Y.; Verbytskyi, A.; Abdullah, Wan Ahmad Tajuddin Wan; Wegener, D.; Wichmann, K.; Wing, M.; Wünsch, E.; Yamada, S.; Yamazaki, Y.; Žáček, J.; Żarnecki, Aleksander Filip; Zawiejski, L.; Zenaiev, O.; Zhang, Z.; Zhautykov, B.O.; Žlebčík, R.; Zohrabyan, H.; Zomer, F.

doi:10.1140/epjc/s10052-018-5848-3

Cited by 78 publications

(97 citation statements)

References 58 publications

(76 reference statements)

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“…In [43] it was found that, after fitting the data for the inclusive cross-section σ red , a very good χ 2 /ndf (< 0.7) was also obtained -without further tuning the fit parameters -for the σ cc red data presented in [55]. We believe that this was mostly a coincidence since a comparison between the best fits in [43] and the more recent, combined, HERA data for charm production [56], with more points and smaller uncertainties, shows a much worse agreement (χ 2 /ndf > 4). The situation is similar with the present fit.…”

Section: Fit Resultsmentioning

confidence: 69%

HERA data and collinearly-improved BK dynamics

et al. 2020

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Within the framework of the dipole factorisation, we use a recent collinearly-improved version of the Balitsky-Kovchegov equation to fit the HERA data for inclusive deep inelastic scattering at small Bjorken x. The equation includes an all-order resummation of double and single transverse logarithms and running coupling corrections. Compared to similar equations previously proposed in the literature, this work makes a direct use of Bjorken x as the rapidity scale for the evolution variable. We obtain excellent fits for reasonable values for the four fit parameters. We find that the fit quality improves when including resummation effects and a physically-motivated initial condition. In particular, the resummation of the DGLAP-like single transverse logarithms has a sizeable impact and allows one to extend the fit up to relatively large photon virtuality Q 2 .

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Section: Fit Resultsmentioning

confidence: 69%

HERA data and collinearly-improved BK dynamics

et al. 2020

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“…Deep inelastic scattering (DIS) is a clean and powerful process to explore the structure of hadrons as a function of longitudinal momentum fraction x and distance scale Q 2 . The most precise DIS measurements so far have been performed at the DESY-HERA electron-proton collider, and the HERA experiments H1 and ZEUS have recently published their precise combined measurements of the proton structure functions [1][2][3][4]. These measurements make it possible to constrain the total parton densities inside the proton to a very good precision.…”

Section: Introductionmentioning

confidence: 99%

Confronting the impact parameter dependent JIMWLK evolution with HERA data

2018

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The small-x evolution of protons is determined from numerical solutions of the JIMWLK equations, starting from an initial condition at moderate x for a finite size proton. The resulting dipole amplitude is used to calculate the total reduced cross section σ r and charm reduced cross section σ rc , as well as diffractive vector meson production. We compare results to experimental data from HERA and discuss fundamental problems arising from the regime sensitive to nonperturbative physics. We emphasize that information on the gluonic content of the proton, gluon spatial distributions and correlations over wide ranges in x, which can in principle be constrained by our study, are essential ingredients for describing the initial state in proton-proton and proton-ion collisions. Future electron nucleus collisions at an electron-ion collider will provide important additional insight for heavier nuclei. We further demonstrate that it is not possible to rigorously probe the saturation regime of the color glass condensate framework in electronproton collisions at HERA energies and that electron-heavy ion collisions will be essential to access its regime of validity.

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“…Additionally, we have to introduce infrared regulators to suppress long distance Coulomb tails when sampling the initial condition and also in the JIMWLK evolution. The parameters are fixed by fitting the HERA combined measurement of the charm structure function data [2] as it is not sensitive to large dipole sizes [14].…”

Section: Resultsmentioning

confidence: 99%

“…To date, the most detailed measurements that probe the partonic substructure of the proton have been performed by the HERA experiments H1 and ZEUS. For example, the accurately measured structure functions [1,2] are proportional to the parton densities and make it possible to extract the quark and gluon distributions over a wide range of longitudinal momentum fraction x and virtuality Q 2 . On top of that, additional information about the transverse geometry can be obtained from studies of exclusive vector meson production also studied extensively at HERA (see e.g.…”

Section: Introductionmentioning

confidence: 99%

Impact parameter dependent JIMWLK evolution meets HERA data

Mäntysaari¹,

Schenke²

2019

Proceedings of International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions — PoS(HardProbes20

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We calculate the small-x evolution of protons with finite size by solving numerically the JIMWLK evolution equation. The initial condition is constrained by the HERA measurements of charm reduced cross section and of exclusive vector meson production. We compute the energy dependence of diffractive cross sections in order to access the energy evolution of the event-by-event fluctuating proton density profile. The fundamental problems arising from the regime sensitive to non-perturbatively large dipoles are also discussed.

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Combination and QCD analysis of charm and beauty production cross-section measurements in deep inelastic ep scattering at HERA

Cited by 78 publications

References 58 publications

HERA data and collinearly-improved BK dynamics

HERA data and collinearly-improved BK dynamics

Confronting the impact parameter dependent JIMWLK evolution with HERA data

Impact parameter dependent JIMWLK evolution meets HERA data

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