COMPASS_pDYexperiment.key

Size: px

Start display at page:

Download "COMPASS_pDYexperiment.key"

せぴあえいさか
4 years ago
Views:

3 / < < / π - X q- γ * μ + q μ - p X

4 1 = 1 + G + + L q L g

5 dσ d 4 qdω = α em Fq ˆσ U [( + S T cos φ 1+D [sin θ]au { A sin φ S T sin φ S + + D [sin θ] ) cos φ ( A sin(φ+φ S) T sin(φ + φ S )+ +A sin(φ φ S) T sin(φ φ S ) h? 1 (p) h? 1 ( ) f? 1T (p) f 1( ) )}] y π - θ p μ + φ z x y S T x φ s q T q μ - π - p z

6 μ4 4 μ l + N (")! l 0 + h 0 + X 5 A sin S UT / f? 1T D 1 p, γ * h X - A cos h UU / h? 1 H? l' x φ h ST γ * l h z

7 PHYSICAL Sivers 関数 HERMES sin(φ-φ sin(φ-φ S) S) UTUT sin(φ-φ sin(φ-φ S) S) UTUT PRL , 1500 (00) K++ π x z PT (GeV) y 0 0 by as much as would have been expected for a not change FIG. 4 (color online) Our Fit 1 to HERMES preliminary deuteron-target data. The line labels are sam sizable 1 -suppressed contribution, e.g., one from lon Boer-Mulders 関数 Acos φ 0 sin(φ-φs) UT π- cos φ 0.05 blind), gives a resulting asym Boer-Mulders Boer-Mu 0.5 than for 1$þ. Cahn+BM Cahn Ph [GeV] Figure 4 shows our Fit 1 to 0.15 π π π deuteron target. πwe have negle 0: < xf < 1: () 0.1 FIG. (color online). Sivers amplitudes for!þ (left) andisospin Kþ symmetry to rela used 0.05 (right) functions of z or Ph?, to compared for#week twoofending different neutron to those of Note that as Boer-Mulders contributions $þ and $ 0 R E V Iranges E W inl E T T E R S OCTOBER 00 Q (high-q points are slightly shifted horizontally) The corresponding fraction of pions and kaons stemming from HERMES Proton Cahn Cahn Q < 4 GeV Cahn π K 0. vector exclusive mesons, extractedboer-mulders from a Monte CarloBoer-Mulders simulaboer-mulders Boer-Mu Q > 4 GeV Cahn+BM Cahn 0.15 πcahn+bm πcahn+bm π+ π+ tion, is provided in bottom panels. A sin(φ-φs) UT 深非弾性散乱を用いた Sivers 関数等の測定 0 ; Q-0.15 > 1 GeV W 0.6 > 10 GeV PT > 0.4 0: GeV Boer-Mulders 0.5; 1Boer-Mulders 0.4 Cahn+BM Cahn+BM Ph [GeV] 0:03 < x < 1:0; 0: < zz < 1:0; 0:3 < y < 0:85 z -0.1 K0 π -0.1 Q -0.1 Acos φ cos φ Acos φ Fig. 7. Sivers asymmetry against x, z and pht for all charged pions and kaons samples from data, and all K S0 s sample from data. A sin(φ-φs) UT Q [GeV ] Deuteron sin(φ-φs) UT COMPASS 133 COMPASS Collaboration / Physics Letters B 673 (00) sin(φ-φs) UT sin(φ-φs) UT sin(φ-φs) UT Proton NVM h / Nh Cahn Cahn Cahn gitudinal photons to spin-(in)dependent cross section. Boer-Mulders Boer-Mulders Boer-Mulders Let us now come to Fit.Cahn+BM In this case, th The experimental cuts of COMPASS experiment Cahn+BM Cahn+BM þ However, while! asymmetries for two Q re0 (which runs with a deuteron target) are and!d are found to be gions are fully consistent, re is a hint of systematically π π π π Q! 1 GeV ; þ W > 5 GeV ;! ¼ :1 $ 0:1;! ¼ %1:111 $ 0: u d 0.1 asymmetries in large-q region smaller K interesting 0: < z < 0:85; An0:1 " y " 0:facetPTof> 0:1 data GeV: is difference in 0.05 π π 0 Ph [GeV] z z verypclose and are toofthose of Fit 1 (again, h [GeV] 0.5!þ and-0.05 K þ amplitudes shown in (31)Fig. 4. On basis positivity bound). Thus, x-dependen u-quark -0.1 dominance, i.e., dominant contribution to!þ 0 þ þ FIG. our þ(color SiversCahn amplitudes! (left) and Kis essentially Mulders functions same In Fig. 5 we show fit to online). COMPASS data. One for Cahn Cahn 0 and K production from scattering off u quarks, one might Boer-Mulders Boer-Mulders Boer-Mulders However, " per degreecahn+bm clearly sees that(right) PTasdependence inof freedom o functions of se z Cahn+BM orþdata Ph?,iscompared for twodifferent Cahn+BM þ amplitudes =d:o:f: naively expect that! and K should be compatible withranges HERMES one and hard to understand cantly smaller: " ¼ :41. In Figs. points are slightly horizontally). in Q (high-q shifted þ þ cos# similar. The difference in! and K amplitudes may oretically. results of Fit for A compared to The corresponding fraction of pions and kaons stemming from z PT (GeV) x K thus pointvector to a significant role offrom or quark Carlo flavors, e.g., x z Ph [GeV] exclusive mesons, extracted a Monte simuladeuteron 0.1 quarks. Strictly speaking, evencompass in case of scattering tion, isonline). provided bottom panels. FIG. sea (color OurinFit 1 to HERMES preliminary proton-target data [17]. The dot-dashe PRL 103(00)1500 dotted line isoff u Boer-Mulder contribution, continuous line isd 1,resulting asymmetry taking FIG. 1. Sivers amplitudes for pions, charged kaons, and solely quarks, fragmentation function con0.15 π+ π+ π+ 0 pion-difference asymmetry (as denoted in panels) as functained in 0.1 both numerator and denominator in Eq. (), not change by as much as would have been expected for a tions of x, z, or Ph?. The systematic uncertainty is given as a does not10.05 cancel in general as it appears in convolution sizable Q -suppressed contribution, e.g., one from lonband at K-bottom of each panel. In addition re is a 7.3% integrals. 0 This can lead not only to additional 0.1 scale uncertainty from target-polarization measurement gitudinal photons to spin-(in)dependent z dependences, but also to a difference incross sizesection. of þ -0.1 However, while! asymmetries for Cahn two Q recahn Cahn 0 Boer-Mulders Boer-Mulders Boer-Mulders gions are fully consistent, re is a hint ofcahn+bm systematically Cahn+BM Cahn+BM amplitudes for Ph? * 0:4 GeV and are consistent with þ smaller K in large-q region. predicted linear decrease in limit of Ph? going to Q < Q (xi) Kπ π asymmetries 0.15 π π + An interesting facet (xi) data is difference in π π Q of > Q 0.1 zero. þ þ! and K amplitudes shown in Fig. 4. On basis of In0.5 order to furr examine influence of exclusive u-quark dominance, i.e., dominant contribution to!þ 0 vector-meson decay and or possible Q1 -suppressed con0 and Kþ production from scattering off u quarks, one might tributions, several studies were performed. Raising -0.1 Cahn naively0 expect that!þcahn and Kþ amplitudescahn should be Boer-Mulders þ Boer-Mulders Boer-Mulders lower limit of Q-1 to 4 GeV 0.4eliminates a large part of þ similar. The difference in! and K amplitudes may Cahn+BM Cahn+BM Cahn+BM 10 vector-meson contribution. Because of strong correla thus point to a10significant x z Ph [GeV] quark flavors, e.g., role of or only tions between x and Q in data, this is presented x z sea quarks. Strictly speaking, even in case of scatteringpt (GeV) dependences. No influence of vectorfor z and P FIG. 1. Sivers h? amplitudes for pions, charged kaons, and solely off u quarks, fragmentation function D1, conplb 673(00)17 PRDdata81(010)11406 (color Fit 1 to COMPASS preliminary (deuteron target) [15,16]. The line labels are meson fraction on asymmetries isinvisible as FIG. shown in online). pion-difference asymmetry (as denoted panels) as 5functainedOur 1in both numerator and denominator in Eq. (), -1-1 Fig..ofFor shown in Fig. 3, each bin was tions x, z, orxpdependence h?. The systematic uncertainty is given as a does not cancel in10general asx it appears in 10 convolution x 第 5 回高エネルギーQCD 核子構造勉強会山形大理糠塚元気 7 / 0 regions below and above divided intobottom two Qof each band at panel. In addition re is acorre7.3%

8 h? 1 DY = h? 1 DIS

10 偏極 DY 実験計画横偏極陽子標的 π- ビーム運動量強度 spill 長サイクル 10 GeV/c 10 π/spill 015 年 5 月から約 5 ヶ月間のデータ収集 014 年 10 月 1月に試験ラン 018 年にも測定を予定.6 s 33.6 s 大角度(< 電磁石 π- 小角度(< 180 mrad)電磁石偏極標的第 5 回高エネルギーQCD 核子構造勉強会 RICH μ識別 30 mrad) μ識別 μ μ 電磁カロリーメータハドロンカロリーメータハドロンカロリーメータ電磁カロリーメータ山形大理糠塚元気 10 / 0

11 < < dn +- µµ/dm (50MeV/c ) J/ NA50, p+pb at 400 GeV ' DRELL-YAN OPEN CHARM EMPTY-TARGET COMB. BACKGROUND M µµ (GeV/c )

12 < < dn +- µµ/dm (50MeV/c ) J/ NA50, p+pb at 400 GeV ' DRELL-YAN OPEN CHARM EMPTY-TARGET COMB. BACKGROUND M µµ (GeV/c )

13 < < dn +- µµ/dm (50MeV/c ) J/ NA50, p+pb at 400 GeV ' DRELL-YAN OPEN CHARM EMPTY-TARGET COMB. BACKGROUND M µµ (GeV/c )

14 xbj に対するアクセプタンスアクセプタンスのある領域アクセプタンスのある領域 +<< *. +<< *. gure 6: Dimuon mass range 4 GeV/cFigure. The left upper panel shows firstgev/c kt -. T 7: Dimuon mass range.5 ment π of u-quark Sivers PDF calculated at Q = 5 GeV Ref. [134]. The moment of u-quarkfrom Sivers PDF calculated at X t lower panel shows covered kinematiclower region in xpshows versus x (in red). kinematic In rightregion + panel covered q Compass * per and lower panels acceptance is shown aspanels a function of xp andacceptanc xf, upper and lower Compass γ pectively. respectively. μ q μ +µ M <.5 GeV/c The conclusions from s µ robability that same muon was registered in both SAS.and LAS, refore ilar to those obtained for high mass range: t X can exceed 100%. sum ofp three contributions nearly corresponds to acceptance of The geometrical acceptance is calculated as ratio between maximal number of events 第 5 回高エネルギーQCD 核子構造勉強会山形大理糠塚元気 1 / 0

15 xbj に対するアクセプタンスアクセプタンスのある領域アクセプタンスのある領域 +<< *. +<< *. gure 6: Dimuon mass range 4 GeV/cFigure. The left upper panel shows firstgev/c kt -. T 7: Dimuon mass range.5 ment π of u-quark Sivers PDF calculated at Q = 5 GeV Ref. [134]. The moment of u-quarkfrom Sivers PDF calculated at X t lower panel shows covered kinematiclower region in xpshows versus x (in red). kinematic In rightregion + panel covered q Compass * per and lower panels acceptance is shown aspanels a function of xp andacceptanc xf, upper and lower Compass γ pectively. respectively. μ q μ +µ M <.5 GeV/c The conclusions from s µ robability that same muon was registered in both SAS.and LAS, refore ilar to those obtained for high mass range: t X can exceed 100%. sum ofp three contributions nearly corresponds to acceptance of The geometrical acceptance is calculated as ratio between maximal number of events 第 5 回高エネルギーQCD 核子構造勉強会山形大理糠塚元気 1 / 0

16 xbj に対するアクセプタンスアクセプタンスのある領域アクセプタンスのある領域 +<< *. +<< *. gure 6: Dimuon mass range 4 GeV/cFigure. The left upper panel shows firstgev/c kt -. T 7: Dimuon mass range.5 ment π of u-quark Sivers PDF calculated at Q = 5 GeV Ref. [134]. The moment of u-quarkfrom Sivers PDF calculated at X t lower panel shows covered kinematiclower region in xpshows versus x (in red). kinematic In rightregion + panel covered q Compass * per and lower panels acceptance is shown aspanels a function of xp andacceptanc xf, upper and lower Compass γ p(uud) と π-(u d) の両方が pectively. respectively. μ q μ valence quark 領域 +µ M <.5 GeV/c.and The conclusions from s µ robability that same muon was registered in both uu SAS LAS, refore の DY 過程が支配的 ilar to those obtained for high mass range: t X can exceed 100%. sum ofp three contributions nearly corresponds to acceptance of The geometrical acceptance is calculated as ratio between maximal number of events 第 5 回高エネルギーQCD 核子構造勉強会山形大理糠塚元気 1 / 0

17 xbj に対するアクセプタンスアクセプタンスのある領域アクセプタンスのある領域 +<< *. +<< *. gure 6: Dimuon mass range 4 GeV/cFigure. The left upper panel shows firstgev/c kt -. T 7: Dimuon mass range.5 ment π of u-quark Sivers PDF calculated at Q = 5 GeV Ref. [134]. The moment of u-quarkfrom Sivers PDF calculated at X t lower panel shows covered kinematiclower region in xpshows versus x (in red). kinematic In rightregion + panel covered q Compass * per and lower panels acceptance is shown aspanels a function of xp andacceptanc xf, upper and lower Compass γ p(uud) と π-(u d) の両方が pectively. respectively. u valence quark 領域 qu μ M <.5 GeV/c.and The conclusions from s robability that same muon was registered in both SAS LAS, refore uu の DY 過程が支配的 μ µ+ µ ilar to those obtained for high mass range: t X can exceed 100%. sum ofp three contributions nearly corresponds to acceptance of The geometrical acceptance is calculated as ratio between maximal number of events 第 5 回高エネルギーQCD 核子構造勉強会山形大理糠塚元気 1 / 0

19 ハドロンアブソーバー目的標的と反応しなかったπ- とμ+μ以外の２次粒子を止める 36 阻止能 /cm/primary π プロトタイプシミュレーション.5 π- 160 アルミニウムステンレスタングステンコンクリート単位 cm 第 5 回高エネルギーQCD 核子構造勉強会山形大理糠塚元気 14 / 0

週間おきに偏極の向きを逆転させ幾何学的な非対称度を打ち消す横偏極モードで運用核磁気共鳴 NMR

24 偏極 DY 実験用偏極陽子標的標的物質 NH 能動核偏極法により最大 0% の陽子 3 偏極度標的セル 55 cm 4 cmφ セル上流と下流の箇所に設置しそれぞれ反対向きに偏極させる約 1 週間おきに偏極の向きを逆転させ幾何学的な非対称度を打ち消す横偏極モードで運用核磁気共鳴 NMR を用いた偏極度測定標的セル第 5 回高エネルギーQCD 核子構造勉強会 π- マイクロ波ストッパー標的セル山形大理糠塚元気 17 / 0

27 DY 実験用偏極陽子標的のアップグレード陽子偏極度の測定偏極度は温度に依存する大強度 π- ビームによる偏極度の減少が心配されるセル内部にコイル設置しビーム中心での偏極度を測定するセル表面に設置セル内部にも追加偏極度測定のノイズ低減水素核を含まない素材ポリクロロトリフルオロエチレンを標的セルに使用するバックグラウンドの低下第 5 回高エネルギーQCD 核子構造勉強会 F F C C F Cl n 山形大理糠塚元気 18 / 0

Electron Ion Collider と ILC-N 宮地義之山形大学

Electron Ion Collider と ILC-N 宮地義之山形大学 ILC-N ILC-N Ee Ee == 250, 250, 500 500 GeV GeV Fixed Fixed target: target: p, p, d, d, A A 33-34 cm-2 LL ~~ 10 1033-34 cm-2 ss-1-1 s s == 22, 22, 32 32 GeV GeV