Polarised quark distributions in the nucleon from semi-inclusive spin asymmetries

Adeva, B.; Akdoğan, T.; Arık, E.; Arvidson, Adam Regn; Badełek, B.; Bardin, G.; Baum, G.; Berglund, P.; Betev, L.; Birsa, R.; Botton, N. de; Bradamante, F.; Bravar, A.; Bressan, A.; Bültmann, S.; Burtin, E.; Crabb, D.; Cranshaw, J.; Çuhadar, T.; Torre, S. Dalla; Dantzig, R. van; Derro, B.; Deshpande, A.; Dhawan, S.; Dulya, C.; Eichblatt, S.; Fasching, D.; Feinstein, F.; Fernández, C.; Forthmann, S.; Frois, B.; Gallas, A.; Garzón, J. A.; Gilly, H.; Giorgi, M. A.; Goeler, E. von; Goertz, S.; Gracia, G.; Groot, N. De; Perdekamp, M. Grosse; Haft, K.; Harrach, D. von; Hasegawa, T.; Hautle, P.; Hayashi, Naoki; Heusch, C. A.; Horikawa, N.; Hughes, V. W.; Igo, G.; Ishimoto, S.; Iwata, T.; Kabuß, E.; Kageya, T.; Karev, A.; Keßler, Hannes; Ketel, T.; Kiryluk, J.; Kisselev, Yu.; Krämer, D.; Krivokhijine, V. G.; Kröger, W.; Kukhtin, V.; Kurek, K.; Kyynäräinen, J.; Lamanna, M.; Landgraf, U.; Goff, J. M. Le; Lehar, F.; Lesquen, A. de; Lichtenstadt, J.; Litmaath, M.; Magnon, A.; Mallot, G.K.; Marie, F.; Martin, A.; Martino, J.; Matsuda, T.; Mayes, B.; McCarthy, J.; Medved, K.; Meyer, W.; Middelkoop, G. van; Miller, Donald H.; Miyachi, Y.; Mori, K.; Moromisato, J.; Nassalski, J.; Naumann, L.; Niinikoski, T.; Oberski, J.E.J.; Ogawa, A.; Özben, C.; Pereira, H.; Perrot‐Kunne, F.; Peshekhonov, D.V.; Pinsky, L.; Platchkov, S.; Pló, M.; Pose, D.; Postma, H.; Pretz, J.; Puntaferro, R.; Rädel, G.; Rijllart, A.; Reicherz, G.; Roberts, J.; Rodrı́guez, M.; Rondio, E.; Roscherr, B.; Sabo, I.; Saborido, J.; Sandacz, A.; Savin, I.; Schiavon, P.; Schiller, A.; Sichtermann, E. P.; Simeoni, Francesca; Smirnov, G.I.; Staude, A.; Steinmetz, A.; Stiegler, U.; Stuhrmann, H. B.; Szleper, M.; Tessarotto, F.; Thers, D.; Tłaczała, W.; Tripet, A.; Ünel, G.; Velasco, M.; Vogt, J.; Voss, R.; Whitten, C.; Windmolders, R.; Willumeit‐Römer, Regine; Wiślicki, W.; Witzmann, A.; Ylöstalo, J.; Zanetti, A.; Заремба, К.; Zhao, J.

doi:10.1016/s0370-2693(97)01546-3

Cited by 170 publications

(107 citation statements)

References 18 publications

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“…The main results are obtained from the larger volume ensembles with the number of the configurations summarized in Table II. On the larger volume, at the heavier three quark masses we make four measurements on each configuration with the conventional single source method using t src ¼ 0, 16, 32, 48, or 8, 19, 40, 51. At the lightest mass the doublesource method [27] is used, and two measurements on each configuration are carried out using the source pairs of (0, 32) and (16,48), or (8,40) and (19,51). We made an additional two measurements on roughly half of the configurations with one or the other source pair.…”

Section: A Statisticsmentioning

confidence: 99%

“…The structure functions are measured in deep-inelastic scattering of electrons off a nucleon [8][9][10][11][12][13][14][15][16][17][18][19], the cross section of which is factorized in terms of leptonic and hadronic tensors, / l W . Since the electron leptonic tensor, l , is known, the cross section provides us with structure information about the target nucleon through the hadronic tensor,…”

Section: Introductionmentioning

confidence: 99%

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Nucleon isovector structure functions in (2+1)-flavor QCD with domain wall fermions

et al. 2010

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3. The right to use all or part of the Article, including the APS-prepared version without revision or modification, on the author(s)' web home page or employer's website and to make copies of all or part of the Article, including the APS-prepared version without revision or modification, for the author(s)' and/or the employer's use for educational or research purposes." 26th April 2013Nucleon isovector structure functions in (2 þ 1)-flavor QCD with domain wall fermions We report on numerical lattice QCD calculations of some of the low moments of the nucleon structure functions. The calculations are carried out with gauge configurations generated by the RBC and UKQCD Collaborations with (2 þ 1)-flavors of dynamical domain-wall fermions and the Iwasaki gauge action ( ¼ 2:13). The inverse lattice spacing is a À1 ¼ 1:73 GeV, and two spatial volumes of ð2:7 fmÞ 3 and ð1:8 fmÞ 3 are used. The up and down quark masses are varied so the pion mass lies between 0.33 and 0.67 GeV, while the strange mass is about 12% heavier than the physical one. The structure function moments we present include the fully nonperturbatively renormalized isovector quark momentum fraction hxi uÀd , the helicity fraction hxi ÁuÀÁd , and transversity h1i uÀ d , as well as an unrenormalized twist-3 coefficient d 1 . The ratio of the momentum to helicity fractions, hxi uÀd =hxi ÁuÀÁd , does not show dependence on the light quark mass and agrees well with the value obtained from experiment. Their respective absolute values, fully renormalized, show interesting trends toward their respective experimental values at the lightest quark mass. A prediction for the transversity, 0:7 < h1i uÀ d < 1:1, in the MS scheme at 2 GeV is obtained. The twist-3 coefficient, d 1 , though yet to be renormalized, supports the perturbative Wandzura-Wilczek relation.

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Section: A Statisticsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nucleon isovector structure functions in (2+1)-flavor QCD with domain wall fermions

et al. 2010

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“…Semi-inclusive measurements in DIS are one possibility, explored by SMC [7] and, more recently and with higher precision, by HERMES [8]. Results are becoming available now also from the COMPASS experiment [9], and measurements have been proposed for the Jefferson Laboratory [10].…”

Section: Introductionmentioning

confidence: 99%

Threshold resummation forW-boson production at BNL RHIC

Mukherjee

Vogelsang

2006

Phys. Rev. D

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We study the resummation of large logarithmic perturbative corrections to the partonic cross sections relevant for the process pp ! W X at the BNL Relativistic Heavy Ion Collider (RHIC). At RHIC, polarized protons are available, and spin asymmetries for this process will be used for precise measurements of the up and down quark and antiquark distributions in the proton. The corrections arise near the threshold for the partonic reaction and are associated with soft-gluon emission. We perform the resummation to next-to-leading logarithmic accuracy, for the rapidity-differential cross section. We find that resummation leads to relatively moderate effects on the cross sections and spin asymmetries.

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“…So, let us look at the SMC results for the first moments of polarized quark distributions obtained within the unbroken sea scenario, where the respective table of first moments looks as (see Table 5 of ref. [7] )…”

mentioning

confidence: 99%

“…Certainly, this is just a speculation based on the above-mentioned assumption. We rather believe that all this is a direct indication that the HERMES data for asymmetries 7 Except for the quantity ∆q * 8 (see comment for the Table 1 of Ref. [8]) where the symmetric sea assumption ∆ū = ∆d = ∆s = ∆s is used.…”

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confidence: 99%

Remarks on polarized quark distributions extracted from SIDIS experiments

Sissakian¹,

Shevchenko²,

Ivanov³

2003

Phys. Rev. D

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The results of SIDIS experiments concerning the first moments of the polarized quark distributions are considered. The possible reasons of the deviation from the fundamental restrictions such as the Bjorken sum rule and the ways to properly improve the analysis of measured SIDIS asymmetries are discussed. The possibility of broken polarized sea scenario is analysed. PACS number(s): 13.60.Hb, 12.38-t, 13.30-a, 13.88.+eThe extraction of the polarized quark and gluon densities is the main task of the SIDIS experiments with the polarized beam and target. Of a special importance for the modern SIDIS experiments are the questions of strange quark and gluon contributions to the nucleon spin, and, also the sea quark share as well as the possibility of broken sea scenario. Indeed, it is known [1] that the unpolarized sea of light quarks is essentially asymmetric, and, thus, the question arises: does the analogous situation occurs in the polarized case, i.e. whether the polarized density ∆ū is equal to ∆d or not.The crucial tests for the polarized quark distributions extracted from the SIDIS data are the sum rules dictated by SU f (2) and SU f (3) symmetries. While SU f (3) symmetry (and, as a consequence, the respective sum rule) is rather approximate (see, for example [2] and refs.

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Polarised quark distributions in the nucleon from semi-inclusive spin asymmetries

Cited by 170 publications

References 18 publications

Nucleon isovector structure functions in (2+1)-flavor QCD with domain wall fermions

Nucleon isovector structure functions in (2+1)-flavor QCD with domain wall fermions

Threshold resummation forW-boson production at BNL RHIC

Remarks on polarized quark distributions extracted from SIDIS experiments

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