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FNAL ドレルヤン実験 E906 による陽子のクォーク・反クォーク 構造の研究

2009.1.10 at KEK. FNAL ドレルヤン実験 E906 による陽子のクォーク・反クォーク 構造の研究. 柴田　利明 東工大. 日本：東工大、理研、 KEK 、京大 アメリカ、台湾　. 陽子の中の sea quark のフレーバー非対称性の起源をさぐる。. Gottfried Sum Rule. Valence quark の積分は 2 (u) 1 (d). NMC による 「 Gottfried 和則の破れ」 （ NMC,1991)

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FNAL ドレルヤン実験 E906 による陽子のクォーク・反クォーク 構造の研究

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  1. 2009.1.10 at KEK FNAL ドレルヤン実験 E906 による陽子のクォーク・反クォーク 構造の研究 柴田　利明 東工大 日本：東工大、理研、KEK、京大 アメリカ、台湾　

  2. 陽子の中のsea quark のフレーバー非対称性の起源をさぐる。 Gottfried Sum Rule Valence quark の積分は2 (u) 1 (d)

  3. NMCによる 「Gottfried和則の破れ」 （NMC,1991) Gottfried和則の破れ －　陽子中では反ｄクォークの方が反uクォークより 多いことを示している。 ･ The Gottfried sum from the ratio F2(n) / F2(p) P. Amaudruz et al.,Phys.Rev.Lett.66: 2712-2715, 1991 ･ A Reevaluation of the Gottfried sum M. Arneodo et al.,Phys.Rev.D50:1-3,1994 0.004 < x < 0.5 Eμ＝90, 280 GeV SG=0.258 ± 0.017 < 0.333

  4. Eμ＝90, 280 GeV SG=0.258 ± 0.017 < 0.333

  5. Drell-Yan Process E906 Drell-Yan Experiment at FNAL 2010 年スタート

  6. 陽子ビーム: FNAL Main Injector Ep = 120 GeV ビーム強度：　ビームスピル中　2x1012/s, 合計陽子ビーム数：　5.2x1018、 標的：　液体水素、液体重水素、原子核（C,Fe,W）、 ドレル・ヤン過程の仮想光子質量の領域：　4.2－8.8 GeV

  7. 800 GeV Earlier Drell-Yan experiments σ　∝　1 / s

  8. J.C. Peng et al. [E866/NuSea Collaboration], “anti-d/anti-u asymmetry and the origin of the nucleon sea”, Phys. Rev. D 58, 092004 (1998), [E866] PRL 80 (1998) 3715

  9. How is suppressed compared to in the Proton? Meson Cloud ? Chiral Solitons ? Instantons ? Proton

  10. Sumamry ･　Drell-Yan process has a well defined kinematics. It enables us to determine the Bjorken x event by event. ・　We are preparing an Experiment E906 at FNAL with 120 GeV proton beam to study the flavor asymmetry of antiquarks in the nucleon. ・ Cross section ratios between p-p, p-d reactions will be measured. ・ It will reach higher x region than the earlier experiments. ・　In unpolarized Drell-Yan process, correlation between transverse quark momentum and quark spin can be studied: Boer-Mulders Function ・　Nuclear targets will also be used to study the nuclear medium effect in Drell-Yan process

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