Measurement of leading neutron production in deep-inelastic scattering at HERA

Aaron, F. D.; Alexa, C.; Andreev, V.; Antunović, B.; Backović, S.; Baghdasaryan, A.; Barrelet, E.; Bartel, W.; Begzsuren, K.; Belousov, A.; Bizot, J.C.; Boudry, V.; Božović-Jelisavc̆ić, I.; Braciník, J.; Brandt, G.; Brinkmann, Martin; Brisson, V.; Bruncko, D.; Bunyatyan, A.; Buschhorn, G.; Bystritskaya, L.; Campbell, A.; Avila, K. B. Cantun; C̆erný, K.; Černý, V.; Chekelian, V.; Cholewa, A.; Contreras, J. G.; Coughlan, J. A.; Cozzika, G.; Cvach, J.; Dainton, J. B.; Daum, K.; Deák, Michal; Delcourt, B.; Delvax, J.; Wolf, E. A. De; Diaconu, C.; Dodonov, V.; Dossanov, A.; Dubak, A.; Eckerlin, G.; Efremenko, V.; Egli, S.; Eliseev, A.; Elsen, E.; Falkiewicz, A.; Favart, L.; Fedotov, A.; Felst, R.; Feltesse, J.; Ferencei, J.; Fischer, D.; Fleischer, M.; Fomenko, A.; Gabathuler, E.; Gayler, J.; Ghazaryan, S.; Glazov, A.; Glushkov, I.; Goerlich, L.; Gogitidze, N.; Gouzevitch, M.; Grab, C.; Greenshaw, T.; Grell, B. R.; Grindhammer, G.; Habib, S.; Haidt, D.; Helebrant, C.; Henderson, R. C. W.; Hennekemper, E.; Henschel, H.; Herbst, M.; Herrera, G.; Hildebrandt, M.; Hiller, K. H.; Hoffmann, D.; Horisberger, R.; Hreus, T.; Jacquet, M.; Janssen, X.; Jönsson, L.; Jung, A. W.; Jung, H.; Kapichine, M.; Katzy, J.; Kenyon, I. R.; Kiesling, C.; Klein, M.; Kleinwort, C.; Kluge, T.; Knutsson, A.; Kogler, R.; Kostka, P.; Kraemer, M.; Krastev, K.; Kretzschmar, J.; Kropivnitskaya, A.; Krüger, K.; Kutak, Krzysztof; Landon, M. P. J.; Lange, W.; Laštovička-Medin, G.; Laycock, P.; Lebedev, A.; Lendermann, V.; Levonian, S.; Li, G.; Lipka, K.; Liptaj, A.; List, B.; List, Jenny; Loktionova, N.; López-Fernández, R.; Lubimov, V.; Lytkin, L.; Makankine, A.; Malinovski, E.; Marage, P.; Marti, L.; Martyn, H. U.; Maxfield, S. J.; Mehta, A.; Meyer, Andreas Bernhard; Meyer, H.; Meyer, J.; Mikocki, S.; Milcewicz-Mika, I.; Moreau, F.; Morozov, A.; Morris, J. V.; Mozer, M. U.; Mudrinic, M.; Müller, K.; Мурін, П.; Naumann, T.; Newman, P. R.; Niebuhr, C.; Nikiforov, A.; Nikitin, D.; Nowak, G.; Nowak, K.; Olsson, J. E.; Osman, S.; Ozerov, D.; Pahl, P.; Palichik, V.; Panagoulias, I.; Pandurović, M.; Papadopoulou, Th. D.; Pascaud, C.; Patel, G. D.; Pejchal, O.; Pérez, E.; Petrukhin, A.; Pićurić, I.; Piec, S. M.; Pitzl, D.; Plačakytė, R.; Pokorny, B.; Polifka, R.; Povh, Bogdan; Radescu, V.; Rahmat, A. J.; Raičević, N.; Raspiareza, A.; Ravdandorj, T.; Reimer, P.; Rizvi, E.; Robmann, P.; Roland, B.; Roosen, R.; Rostovtsev, A.; Rotaru, M.; Tabasco, J. E. Ruiz; Rusakov, S. V.; Šálek, D.; Sankey, D. P. C.; Sauter, M.; Sauvan, E.; Schmitt, S.; Schoeffel, L.; Schöning, A.; Schultz‐Coulon, H.‐C.; Sefkow, F.; Shaw-West, R.N.; Shtarkov, L. N.; Shushkevich, S.; Sloan, T.; Smiljanić, I.; Soloviev, Y.; Sopicki, P.; South, D.; Spaskov, V.; Specka, A.; Staykova, Z.; Steder, M.; Stella, B.; Stoicea, G.; Straumann, U.; Sunar, D.; Sýkora, T.; Tchoulakov, V.; Thompson, G.; Thompson, P. D.; Toll, T.; Tomasz, F.; Tran, T. H.; Traynor, D.; Trinh, T. N.; Truöl, P.; Tsakov, I.; Tseepeldorj, B.; Turnau, J.; Urban, K.; Valkárová, A.; Vallée, C.; Mechelen, P. Van; Trevino, A. Vargas; Vazdik, Y.; Vinokurova, S.; Volchinski, V.; Driesch, M. von den; Wegener, D.; Wissing, C.; Wünsch, E.; Žáček, J.; Zálešâk, J.; Zhang, Zhiqing Philippe; Zhokin, A.; Zimmermann, T.; Zohrabyan, H.; Zomer, F.

doi:10.1140/epjc/s10052-010-1369-4

Cited by 99 publications

(202 citation statements)

References 84 publications

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“…3 in fitting the HERA leading neutron production data [1,2], and the compatibility of the results with thed −ū asymmetry extracted from the E866 Drell-Yan measurement [7]. While some dedicated analyses [37] have attempted to describe the HERA leading neutron spectra at all kinematics, our aim here was instead to maximize the sensitivity to the basic one-pion exchange contribution, which has the most direct connection to the chiral effective theory.…”

Section: Efficacy Of the Pion Exchange Model In Leading Neutron Produmentioning

confidence: 99%

“…A similarly extensive range of kinematics was covered by the ZEUS data [1]. Taking the t-dependent exponential model with y cut = 0.3 as the optimal result of our fits, we obtained the spectra of leading neutrons from the ZEUS [1] and H1 [2] experiments, as shown in Figs. 3 and 4, respectively.…”

Section: Ln(3)mentioning

confidence: 99%

“…Our analysis has sought to determine whether both thed −ū asymmetry in the proton extracted from the E866 Drell-Yan data [7] and the HERA leading neutron cross sections [1,2,3] can be obtained consistently within a common pion exchange framework. Rather than relying on assumptions about specific forms for the pion distributions in the nucleon, we have addressed the model dependence empirically, by performing the first comprehensive statistical analysis of the combined HERA leading neutron and E866 data sets, for a wide range of prescriptions adopted in the literature for regularizing the pion-nucleon amplitudes.…”

Section: Future Directionmentioning

confidence: 99%

“…This complementary effort has been the study of leading neutron production in semi-inclusive deep inelastic scattering (DIS) on the proton, in which a forward moving neutron is produced in coincidence with the scattered lepton in the high-energy reaction ep → enX. Several dedicated experiments at the ep collider HERA [1,2,3] have collected high-precision data on the spectrum of leading neutrons carrying a large fraction of the proton's energy. Moreover, the upcoming tagged DIS (TDIS) experiment at Jefferson Lab [4] plans to take data on the production of leading protons from an effective neutron target in the reaction en → epX, which, in analogy with the HERA leading neutron leptoproduction, can be described through the exchange of a π − .…”

Section: Introductionmentioning

confidence: 99%

“…In particular, we have recently addressed [6] the question of whether one can reduce the model dependence of F π 2 extracted from the HERA data [1,2,3] by using additional constraints from the data on the SU(2) flavor asymmetryd −ū, especially those from the E866 Drell-Yan experiment [7]. Because the E866 data are at relatively high x values compared with the HERA measurements, within the pion exchange framework they are sensitive to the pion PDFs at large x π , where these are well determined from pion-nucleon Drell-Yan data [8,9,10].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Pion structure function and SU(2) flavor asymmetry

Ji¹

2017

Proceedings of QCD Evolution 2016 — PoS(QCDEV2016)

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We refine the computation of thed −ū flavor asymmetry in the proton sea with a complementary effort to reveal the dynamics of pion exchange in high-energy processes. In particular, we discuss the efficacy of pion exchange models to simultaneously describe leading neutron electroproduction at HERA along with thed −ū flavor asymmetry in the proton. A detailed χ 2 analysis of the ZEUS and H1 cross sections, when combined with constraints on the pion flux from Drell-Yan data, allows regions of applicability of one-pion exchange to be delineated. The analysis disfavors several models of the pion flux used in the literature, and yields an improved extraction of the pion structure function and its uncertainties at parton momentum fractions in the pion of 4 × 10 −4 x π 0.05 at a scale of Q 2 = 10 GeV 2 . Based on the fit results, we also address a possible estimate for leading proton structure functions in upcoming tagged deep-inelastic scattering experiments at Jefferson Lab on the deuteron with forward protons.

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