References - Bogoliubov Laboratory of Theoretical Physics - JINR

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[4] H. Okada et al., Proc. of the 12th International Workshop on Polarized Ion Sources, Targets and Polarimetry, Upton, New York, Sep 10-14, 2007, p. 370. [5] I.G. Alekseev et al., Phys.Rev.D79, 094014 (2009). [6] H. Okada et al., Phys. Lett. B 638, 450 (2006). [7] I. Nakagawa et al., Proc. of the 12th International Workshop on Polarized Ion Sources, Targets and Polarimetry, Upton, New York, Sep 10-14, 2007, p. 380. [8] I. Nakagawa et al., Proc. of the 17th International Spin Physics Symposium, Kyoto, Japan, Oct 2-7, 2006, p. 912. [9] Y. Fukao et al., Phys. Lett. B 650, 325 (2007). [10] C. Adler et al., Nucl. Inst. and Meth. A 470, 488 (2001). [11] M. Togawa, Proc. of the XIII International Workshop on Polarized Sources, Targets and Polarimetry, Ferrara (Italy), September, 7-11, 2009. [12] R.D. Klem et al., Phys. Rev. Lett. 36, 929 (1976); W.H. Dragoset et al., Phys.Rev. D 18, 3939 (1978); S. Saroff et al., Phys. Rev. Lett. 64, 995 (1990); B.E. Bonner et al., Phys.Rev.D41, 13 (1990); B.E. Bonner et al., Phys. Rev. Lett. 61, 1918 (1988); A. Bravar et al., ibid 77, 2626 (1996); D.L. Adams et al., Phys. Lett. B 261, 201 (1991); 264, 462 (1991); Z. Phys. C 56, 181 (1992); K. Krueger et al., Phys. Lett. B 469, 412 (1999); C.E. Allgower et al., Phys.Rev.D65, 092008 (2002); [13] J. Adams et al., Phys. Rev. Lett. 92, 171801 (2004). [14] I. Arsene et al., Phys. Rev. Lett. 101, 042001 (2008). [15] J. Kiryluk et al., Proc. of the 16th International Spin Physics Symposium, Trieste, Italy, Oct 10-16, 2004, p. 718. [16] A. Zelenski et al., Proc. of the 18th International Spin Physics Symposium, Chartlottesville, Virginia, Oct 6-11, 2008, p. 731. [17] Y. Makdisi et al., Proc. of the 18th International Spin Physics Symposium, Chartlottesville, Virginia, Oct 6-11, 2008, p. 727. 396
DEVELOPMENT OF HIGH ENERGY DEUTERON POLARIMETER BASED ON dp-ELASTIC SCATTERING AT THE EXTRACTED BEAM OF NUCLOTRON-M. Yu.V. Gurchin 1 † ,L.S.Azhgirey 1 , A.Yu. Isupov 1 ,M.Janek 1,2 ,J.-T.Karachuk 1,3 , A.N. Khrenov 1 ,V.P.Ladygin 1 ,S.G.Reznikov 1 , T.A. Vasiliev 1 and V.N. Zhmyrov 1 (1) JINR, Dubna (2) P.J.Shafaric University, Koshice, Slovakia (3) Advansed Research Institute for Electrical Engineering, Bucharest, Romania † E-mail: gurchin@jinr.ru Abstract The selection of the dp-elastic scattering events at the energy of 2 GeV using scintillation counters has been performed. The procedure of the CH2−C subtraction has been established. This method can be used to develop the efficient high energy deuteron beam polarimetry. The investigations with the use of high energy polarized deuteron beams proposed at different facilities require the efficient polarimetry at these energies to deduce values of polarization observables reliably. However, only some reactions can be used to provide efficient polarimetry of high energy deuteron. Since deuteron is spin-1 particle deuteron beam has vector and tensor polarizations. The polarimetry should have a capability to determine both components of polarization, if possible, simultaneously. The polarimeters based on deuteron inclusive breakup with the proton emission at zero degree [1] and pp- quasi-elastic scattering [2] are currently used at LHEP-JINR Accelerator Complex to provide the polarimetry of the deuterons at high energies. But these analyzing reactions cannot be used for the simultaneous measurements of the tensor and vector polarizations of the beam, because deuteron inclusive breakup at zero degree and pp- quasi-elastic scattering have no vector and tensor analyzing powers, respectively. The dp-elastic scattering at backward angles has been successfully used for the deuteron polarimetry at RIKEN at a few hundreds of MeV [3]. This reaction has several advantages as a beam-line polarimetry over the others. Firstly, both vector and tensor analyzing powers have large values. Secondly, a kinematical coincidence measurement of deuteron and proton with simple plastic scintillation counters suffices for event identification. The same polarimeter for higher energies has been proposed [4], constructed and calibrated at 880 MeV [5] at Internal Target Station at Nuclotron. The goal of present investigation is to study the possibility to use high energy dp-elastic scattering at forward angles with the selection by means of the kinematical coincidences of deuteron and proton with simple plastic scintillation counters for extracted beam polarimetry at Nuclotron. The schematic view of the experiment at extracted beam of Nuclotron is shown in Fig. 1. The setup consists of two scintillation detectors based on FEU-85 photomultiplier tubes. Measurements were performed using deuteron beam of 1.6 and 2.0 GeV and polyethylene and carbon targets. The deuteron detector was placed at 8 ◦ in lab. The proton detector was placed in the kinematical coincidence. 397
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XIII Advanced Research Workshop on
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ã�� [539.12.01 + 539.12 ... 14
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Analytic perturbation theory and pr
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Measurements of GEp/GMp to high Q 2
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WELCOME ADDRESS Alexei Sissakian Di
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he joined the group of prof. Przemy
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proton. Dividing these 90 ◦ cm p-
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p-p scattering angle fixed at exact
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tuning for each ring. The Workshop
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was only about 10 5 per second, but
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[10] E.F. Parker et al., Phys. Rev.
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MICROSCOPIC STERN-GERLACH EFFECT AN
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DeGrand-Miettinen model predicted P
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TOWARDS STUDY OF LIGHT SCALAR MESON
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104xdBR(φ--> π η 0 -1 γ )/dm, G
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RECURSIVE FRAGMENTATION MODEL WITH
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Figure 2: String decaying into pseu
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pT -distributions in the quark frag
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4 Inclusion of spin-1 mesons For a
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CONSTITUENT QUARK REST ENERGY AND W
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〈r 2 ch 〉≈1fm2 . Now with Eqs
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TOWARDS A MODEL INDEPENDENT DETERMI
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Common for the difference cross sec
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TRANSVERSITY GPDs FROM γN → πρ
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The scattering amplitude of the pro
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INFRARED PROPERTIES OF THE SPIN STR
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5 Acknowledgement B.I. Ermolaev is
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We shall call this model the “sec
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y f ν V = f l V = f u V = f d gz V
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2. We remind, that the celebrated G
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of the resonance A, θV � 39 o .
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• Right-handed EW currents. The c
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pesum- (p Entries 0 + pe)-(p-pe) Me
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CROSS SECTIONS AND SPIN ASYMMETRIES
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R(ρ) 5 4 3 2 1 0 2 3 4 5 6 7 8 9 1
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TWO-PHOTON EXCHANGE IN ELASTIC ELEC
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and depend on three parameters : fN
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O(αs) SPIN EFFECTS IN e + e −
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3 Polarization results for mq → 0
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Since one has (↑↓) pc Born =(
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Figure 1: A typical lowest order Fe
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sin φ S (π + ) A UT 1.0 0.8 0.6 0
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form the agreement with these data
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in settling this dynamical issue. G
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SPIN CORRELATIONS OF THE ELECTRON A
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the two-photon system equaling 1).
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ANOTHER NEW TRACE FORMULA FOR THE C
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Compare the gain of time and effort
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where the triplet and octet axial c
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[2] Y. Prok et al. [CLAS Collaborat
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Melosh rotations which boost the re
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ky �GeV� 0.4 0.2 0.0 �0.2 �
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[2] B. Pasquini, and S. Boffi, Phys
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The appearance of both |+〉 and |
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2.2 Intrinsic Transverse Motion Qua
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are still complex: for a given corr
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This last is required to complete t
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[16] P.G. Ratcliffe and O.V. Teryae
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Figure 1: a)[left] μpG p E /Gp M (
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4 Conclusion We introduced a simple
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√ δΔq8 x for Δq8 and γΔGx fo
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understanding of polarized light qu
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They are inverse powers of Q 2 kine
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accounts approximately for the TM a
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POTENTIAL FOR A NEW MUON g-2 EXPERI
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When the momentum increases (p >p0)
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EVOLUTION EQUATIONS FOR TRUNCATED M
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4 Perspectives Evolution equations
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NEW DEVELOPMENTS IN THE QUANTUM STA
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statistical approach compared to th
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POLARIZED HADRON STRUCTURE IN THE V
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g 3 A =Δuv(Q 2 ) − Δdv(Q 2 ), g
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AXIAL ANOMALIES, NUCLEON SPIN STRUC
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3. Vector current of strange quarks
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ORBITAL MOMENTUM EFFECTS DUE TO A L
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The elastic scattering S-matrix in
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IDENTIFICATION OF EXTRA NEUTRAL GAU
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for final l + l − events (l = μ,
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QUARK INTRINSIC MOTION AND THE LINK
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where wP = − m 2M 2 −p1 cos ω
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where g q 2x − ξ 1(x, pT )= πM2
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EXPERIMENTAL RESULTS
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01 00 11 01 01 01 00 11 01 01 01 00
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where C1, C2 and A1 - signals from
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Figure 1: Layout of experiment targ
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According to requirements of the de
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Electron energy is measured at ATLA
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Fig. 2 shows the results of the lon
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e γ* e’ x+ ξ x− ξ A A’ e e
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cos 0φ C A φ cos C A cos 2φ C A
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5 Summary HERMES has measured signi
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(1.205 ± 0.0012) GeV/c, 10 10 p/s,
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was done in the interval ”−t”
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If we admit a non-zero quark transv
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which is trivial in collinear LO ap
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In figure 3 the expected errors on
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[12] A. V. Efremov and O. V. Teryae
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Figure 1: The COMPASS spectrometer.
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Comparing this formula to the inclu
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Figure 5: Comparison of COMPASS inc
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[9] B. Adeva et al. (SMC Coll.), Ph
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q T sin( φ-φ ) M AUT 0.14 0.12 0.
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proton beam is planned. References
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Run Year √ s (GeV) Polarization R
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ackground fraction, and asymmetry i
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At √ s = 200 GeV, ALL(pp → π
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[6] D. de Florian, W. Vogelsang, an
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higher energies, where the cross se
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Figure 3: The experimental results
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kinematic range to low values of Bj
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3 Semi-Inclusive DIS Collins and Si
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Unpolarized target asymmetries. The
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4 Summary Since the end of data-tak
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polarization as well as a construct
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Finally the COMPASS reconstruction
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tained in the NLO QCD approximation
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with only modern NN potential are r
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(a) (b) Figure 3: (a) T20 data take
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of electroproduction from polarized
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As is seen in Fig. 1 values of the
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SEMI-INCLUSIVE DIS AND TRANSVERSE M
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The yellow band in Fig. 1 is the re
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At leading twist, a third asymmetry
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THE COMPLETION OF SINGLE-SPIN ASYMM
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A N , % 30 20 10 0 0 0.2 0.4 0.6 0.
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Unexpectedly large single spin asym
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THE GENERALIZED PARTON DISTRIBUTION
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, E) H ~ (H, I Im C 5 4 3 2 1 Q = 1
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Reducing to a common denominator (
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LAMBDA PHYSICS AT HERMES S. Belosto
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analysis was carried out reconstruc
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SPIN PHYSICS AT NICA A. Nagaytsev J
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original software packages (MC simu
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MEASUREMENTS OF TRANSVERSE SPIN EFF
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to “near-side” and “away-side
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THE FIRST STAGE OF POLARIZATION PRO
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In paper [12] the study was made of
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emphasis to increase the statistics
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Table 2: The parameters of the main
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POLARIZATION MEASUREMENTS IN PHOTOP
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With a polarized electron beam inci
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Figure 3: Preliminary helicity asym
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INVESTIGATION OF DP-ELASTIC SCATTER
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framework with the use of deuteron
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SPIN PHYSICS WITH CLAS Y. Prok 12,
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1.3 Flavor Decomposition of the Hel
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Γ p 1 0.15 0.125 0.1 0.075 0.05 0.
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The upcoming energy upgrade of Jeff
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y the nearly 1000 combined citation
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� R = −Pt/Pl τ(1 + ε)/2ε; he
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4 Results of GEp-III Experiment In
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6 Theoretical Developments The earl
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lz = 0 (along the direction of the
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models have recently been challenge
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[32] Chung P. L. and F. Coester, Ph
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48 ± 3% for two beams. The proton
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is constant with cos θ∗ , as exp
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In summary, we made measurements on
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angle between the direction of the
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The sensitivity of the data to the
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COMPASS could be converted into a f
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3.1.2 Beam charge and spin asymmetr
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contributions enter only beyond lea
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References [1] D. Mueller et al, Fo
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l’ l p q p h H (z) 1 h (x) 1 l l
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3. Data selection. The data selecti
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φ sin3 a 0.06 0.04 0.02 0 -0.02 -0
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TRANSVERSE SPIN AND MOMENTUM EFFECT
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model. Both the cos φh and the cos
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D cos φ A 0 -0.1 -0.2 -0.3 + h -2
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4.3 The Sivers asymmetry According
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Page 350 and 351: 2. Delta-Sigma Experimental Set-up.
Page 352 and 353: 6. Estimate of the count rate in tr
Page 354 and 355: 2 Analysis Formalism Spin-dependent
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Page 358 and 359: 6 High pT hadron pair analysis for
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Page 362 and 363: 2 Towards polarized Antiprotons For
Page 364 and 365: 4 Spin-Filtering Experiments at COS
Page 366 and 367: to test the theoretical models of t
Page 368 and 369: C1 C2 π CH1,2 CH3,4 CH5,6 111 000
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Page 374 and 375: The differential cross section of t
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Page 386 and 387: 2.6 Summary and Outlook The first d
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Page 391 and 392: PROTON BEAM POLARIZATION MEASUREMEN
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Page 396 and 397: Intensity profile (arb. units) 1 0.
Page 400 and 401: The amplitudes of the signals and t
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Page 410 and 411: 3 The conditions for transparent sp
Page 412 and 413: where angles α and β are defined
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Page 416 and 417: espectively. The open symbols repre
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Page 420 and 421: i PV / PV i PV / PV 1 0.5 0 -0.5 -1
Page 422 and 423: The energies of the states Ψ1 −
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Page 428 and 429: y detector saturation from pC colli
Page 430 and 431: 2 �p+ 8 He analyzing power measur
Page 432 and 433: 3.3 Effect of valence neutrons on s
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Page 441 and 442: REGULARIZATION OF SOURCE OF THE KER
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SPINDYNAMICS I.B. Pestov JINR, 1419
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State of hadron matter is defined t
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REMARK ON SPIN PRECESSION FORMULAE
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It is easy to see that for a (massi
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DYNAMICS OF SPIN IN NONSTATIC SPACE
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Schwinger gauge. Probably for the f
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DSPIN-09 WORKSHOP SUMMARY Jacques S
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to some preliminary results reporte
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A new measurement of the polarizati
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new NLO QCD parametrization of the
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Name (Institution, Town, Country) E
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References - Bogoliubov Laboratory of Theoretical Physics - JINR

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