Gluon polarization in the nucleon from quasi-real photoproduction of high-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:msub><mml:mi>p</mml:mi><mml:mi mathvariant="normal">T</mml:mi></mml:msub></mml:math> hadron pairs

Ageev, E.S.; Alexakhin, V.; Alexandrov, Yu.; Alexeev, G. D.; Amoroso, A.; Badełek, B.; Balestra, F.; Ball, J.; Baum, G.; Bedfer, Y.; Berglund, P.; Bernet, C.; Bertini, R.; Birsa, R.; Bisplinghoff, J.; Bordalo, P.; Bradamante, F.; Bravar, A.; Bressan, A.; Brona, G.; Burtin, E.; Bussa, M.P.; Bytchkov, V.; Cerini, L.; Chapiró, A.; Cicuttin, A.; Colantoni, M.; Colavita, A.; Costa, S.; Crespo, M.L.; Torre, S. Dalla; Dasgupta, S.; Dedek, N.; Masi, R. De; Денисов, О.; Dhara, L.; Diaz, V.; Dinkelbach, A.M.; Dolgopolov, A.; Donskov, S.V.; Dorofeev, V.; Doshita, N.; Duic, V.; Dünnweber, W.; Ehlers, J.; Eversheim, P.D.; Eyrich, W.; Fabro, M.; Faessler, M.; Falaleev, V.; Fauland, P.; Ferrero, A.; Ferrero, L.; Finger, M.; Fischer, H.; Franz, J.; Jm, Friedrich; Frolov, V. V.; Garfagnini, R.; Gautheron, F.; Gavrichtchouk, O.P.; Gerassimov, S.; Geyer, R.; Giorgi, M. A.; Gobbo, B.; Goertz, S.; Gorin, A.; Grajek, O.A.; Grasso, A.; Grube, B.; Grünemaier, A.; Hannappel, J.; Harrach, D. von; Hasegawa, T.; Hedicke, S.; Heinsius, F. H.; Hermann, R.; Heß, C.; Hinterberger, F.; Hodenberg, M. von; Horikawa, N.; Horikawa, S.; d’Hose, N.; Ijaduola, R.; Ilgner, C.; Ioukaev, A.I.; Ishimoto, S.; Ivanov, О. N.; Iwata, T.; Jahn, R.; Janata, A.; Joosten, R.; Jouravlev, N.I.; Kabuß, E.; Kalinnikov, V. A.; Kang, D.; Karstens, F.; Kastaun, W.; Ketzer, B.; Khaustov, G.V.; Khokhlov, Yu.A.; Khomutov, N. V.; Kisselev, Yu.; Klein, F.; Koblitz, S.; Koivuniemi, J.H.; Kolosov, V.N.; Komissarov, E.V.; Kondo, K.; Königsmann, K.; Konoplyannikov, A.; Konorov, I.; Константинов, В.Ф.; Korentchenko, A.S.; Korzenev, A.; Kotzinian, A.M.; Koutchinski, N.A.; Kowalik, K.; Kravchuk, N. P.; Krivokhizhin, G.V.; Kroumchtein, Z.V.; Kühn, Ralf; Kunne, F.; Kurek, K.; Ladygin, M.E.; Lamanna, M.; Leberig, M.; Goff, J. M. Le; Lichtenstadt, J.; Liška, T.; Ludwig, I.; Maggiora, A.; Maggiora, M.; Magnon, A.; Mallot, G.K.; Manuilov, I.; Marchand, Claude; Marroncle, J.; Martin, A.; Marzec, J.; Matsuda, T.; Maximov, A.; Medved, K.; Meyer, W.; Mielech, A.; Mikhailov, Yu.V.; Moinester, M. A.; Nähle, O.; Nassalski, J.; Neliba, S.; Neyret, D.; Nikolaenko, V.; Nozdrin, A.; Obraztsov, V.; Оlshevsky, А.G.; Ostrick, M.; Padee, A.; Pagano, Paolo; Panebianco, S.; Panzieri, D.; Paul, S.; Pereira, H.; Peshekhonov, D.V.; Peshekhonov, V. D.; Piragino, G.; Platchkov, S.; Platzer, K.; Pochodzalla, J.; Polyakov, V.A.; Popov, A.; Pretz, J.; Procureur, S.; Quintans, C.; Ramos, S.; Rebourgeard, P.; Reicherz, G.; Reymann, J.; Rith, Klaus; Rondio, E.; Rozhdestvensky, A.M.; Sadovski, A.; Saller, E.; Samoylenko, V.D.; Sandacz, A.; Sans, M.; Sapozhnikov, M. G.; Savin, I.; Schiavon, P.; Schill, C.; Schmidt, Th.; Schmitt, H.; Schmitt, L.; Shevchenko, O.Yu.; Shishkin, A.A.; Siebert, H. W.; Sinha, L.; Sissakian, A.; Skachkova, A. N.; Slunečka, M.; Smirnov, G.I.; Sozzi, F.; Srnka, A.; Stinzing, F.; Stolarski, M.; Sugonyaev, V.P.; Šulc, M.; Sulej, R.; Takabayashi, N.; Tchalishev, V.V.; Tessarotto, F.; Teufel, Andreas; Thers, D.; Tkatchev, L. G.; Toeda, T.; Tretyak, V.I.; Trousov, S.; Varanda, M.; Virius, M.; Vlassov, N.V.; Wagner, Mathias; Webb, Richard; Weise, E.; Weitzel, Q.; Wiedner, U.; Wiesmann, M.; Windmolders, R.; Wirth, S.; Wiślicki, W.; Zanetti, A.; Заремба, К.; Zhao, J.; Ziegler, Robert; Zvyagin, A.

doi:10.1016/j.physletb.2005.11.049

Cited by 126 publications

(42 citation statements)

References 29 publications

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“…Viable probes of ∆g(x, µ) at fixed-target energies comprise of one-and two-hadron and open charm production and have been exploited by several experimental collaborations [12,13,14,15]. The proper theoretical description of these processes depends on the virtuality of the probing photon and is in general more involved than corresponding calculations for hadron-hadron scattering.…”

Section: Motivation and Introductionmentioning

confidence: 99%

Longitudinally polarized photoproduction of heavy flavors at next-to-leading order of QCD

2013

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Abstract. We present a phenomenological study of charm quark photoproduction in longitudinally polarized lepton-hadron collisions at next-to-leading order accuracy of QCD. Our results are based on a recently developed, flexible parton-level Monte Carlo program for spin-dependent heavy flavor hadroproduction, which we extend to deal also with both direct and resolved photon contributions. The subsequent hadronization into charmed mesons is modeled in our calculations, which allows us to compare with data on double-spin asymmetries for D 0 meson production taken by the COMPASS collaboration. In general, next-to-leading order QCD corrections are found to be very significant and do not cancel in spin asymmetries. We elucidate the role of the individual hard scattering subprocesses and determine the range of parton momentum fractions predominantly probed for charm production at COMPASS. Theoretical uncertainties are estimated by varying renormalization and factorization scales and parameters controlling the hadronization of the charm quarks.

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Section: Motivation and Introductionmentioning

confidence: 99%

Longitudinally polarized photoproduction of heavy flavors at next-to-leading order of QCD

2013

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“…[7][8][9] Since the leading order photo-absorption process is not sensitive to ∆g/g one has to study higher order processes like photon-gluon fusion (PGF) to access ∆g. For example in LO a clean sample of PGF are events with charmed mesons produced in the final state.…”

Section: Gluon Polarisationmentioning

confidence: 99%

Latest Results from the COMPASS Experiment

Stolarski

2016

Int. J. Mod. Phys. Conf. Ser.

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“…The most accurate information on ∆G is now that provided by the new COMPASS measurement of the jet asymmetry at low Q 2 , based on data taken between 2002 and 2004. It indicates that ∆G(x) must be close to zero in a range of x ∼ 0.085 for µ 2 ∼ 3 GeV 2 [13]. A recent update of the earlier HERMES measurement also indicates a small value of ∆G(x) in a range of x ∼ 0.22 for µ 2 ∼ 1.35 GeV 2 [14]:…”

Section: Figurementioning

confidence: 99%

Polarization puts a New Spin on Physics

Ellis¹

2007

AIP Conference Proceedings

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Abstract. Polarization and spin effects are useful for probing the Standard Model, in both the electroweak sector and the strong sector, where the spin decomposition of the nucleon is still a hot topic, with important new data on the net polarizations of the gluon and the strange quarks. Spin phenomena are also useful in searches for new physics, for example via measurements of the anomalous magnetic moment of the muon and searches for electric dipole moments. The cross sections for the direct detection of dark matter may also have an important spin-dependent component, related to the spin decomposition of the nucleon, that could be an important diagnostic tool. Polarization effects are also important diagnostic aids for high-energy experiments at electronproton, proton-proton and electron-positron colliders.

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Gluon polarization in the nucleon from quasi-real photoproduction of high-pT hadron pairs

Cited by 126 publications

References 29 publications

Longitudinally polarized photoproduction of heavy flavors at next-to-leading order of QCD

Longitudinally polarized photoproduction of heavy flavors at next-to-leading order of QCD

Latest Results from the COMPASS Experiment

Polarization puts a New Spin on Physics

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