References - Bogoliubov Laboratory of Theoretical Physics - JINR

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original software packages (MC simulation, generator etc.) was developed. The SSA asymmetries, which can be measured with SPD NICA detector are estimated to be about 5-10% and the simulations shows that the such asymmetries are be visible within the errors at the statistics about 100K events, which corresponds to two years of data taking. The measurements of J/ψ production processes are also very important for tests of duality model and due to unique possibility to contribute the data in unpolarized J/ψ production. The data on both unpolarized and polarized J/ψ production obtained with SPD NICA can essentially improve the theoretical models of unpolarized J/ψ production. The possibility of NICA facility to change the energy beams allows to scan different kinematical regions and to obtain the unique information. The preliminary design of (SPD) detector for spin effects studies is based on the requirements imposed by the DY and J/ψ productions studies. These requirements are the following: almost 4π geometry for secondary particles; precise vertex detector; precise tracking system ; precise momentum measurement od secondary particles; good particle identification capabilities (μ, π, p, e, etc.) high trigger rate capabilities. The most of these requirements are also good for other studies mentioned above. Basing on these requirements several possible scheme of SPD are considered, one of them is similar to the detector Figure 1: The design of SPD with Range System shown at the edge of the detector. The nagnet system is shown in red, EC- in yellow. of PAX experiment (close to NICA in kinematics) [3] at FAIR GSI, the second one is the SPD of limited posibilities, providing the muon pair detection only and the third is the scheme of SPD based on so-called Muon Range System, which is considered as detector for PANDA muon system. This scheme is shown in Fig. 1 The main parts of this scheme is described below. The toroid magnet of the spectrometer provides a field free region around the interaction point and does not disturb the trajectories. The toroid magnet can consist of 8 superconducting coils symmetrically placed around the beam axis. A support ring upstream of the target hosts the supply lines for electric power and for liquid helium. At the downstream end, an hexagonal plate compensates the magnetic forces to hold the coils in place. The field lines of ideal toroid magnet are always perpendicular to the path of the particles originating from the beam line. Since the field intensity increases inversely proportional to the radial distance: greater bending power is available for particles scattered at smaller angles, which have higher momenta. These properties help to design a compact spectrometer that keeps the investment costs for the detector tolerable. The production of such a field requires the insertion of the coils into the tracking volume shadowing part of the azimuthal acceptance. Preliminary studies show that the use of superconducting coils, made by a Nb3Sn-Copper core surrounded by a winding of aluminum for support and cooling, allows one to reach an azimuthal detector acceptance in excess of 85%, while the radius of the inner magnet volume can be about 0.3 m and outer - about 0.7m, with � BdL ∼ 0.8 − 1Tm. Several layers of double-sided Silicon strips can provide a precise vertex reconstruction and tracking of the particles before they reach the magnet. The design should use a small number of silicon layers to minimize the radiation length of the 268
tracking material. With a pitch of 50-100 μm it is possible to reach an spatial resolution of 20-30 μm. Such a spatial resolution would be provide 50-80 μm for precision of the vertex reconstruction, and permits to reject the secondary decays of mesons into leptons. The coordinate resolution of 150-200 μ can be achieved with conventional drift chambers. The chambers can be assembled as modules consisting of several pairs of tracking planes with wires at -30 ; 0 ; 0 ; +30 deg. with respect to the direction parallel to the magnetic field lines. This can provide the momentum resolution of the order of 1-3 % over the kinematic range of the detector. The calorimeter can consists of “shashlyk” modules with the application of new readout technics based on AMPD technology working in the magnetic field. The modules can have an area of 4x4cm2 and a length of 30-40 cm. The expected energy resolution can be σ(E)/E =(5− 8)%/ √ E. The calorimeter also can be used for the triggering of DY electrons. Sets of hodoscope planes are used for triggering. To improve the lepton identification, the passive Pb radiator (about 2 radiation lengths) can be placed in front of the external hodoscope to initiate the electromagnetic showers. The system of mini-drift layers with Fe layers called by Range System (RS). It can provide the clean (¿ 99%) muon identification for muon momenta grater than 1 GeV. The combination of responses from EM calorimeter and RS can be used for the identification of pions and protons in the wide energy range. The final version of the SPD will be defined after detailed Monte-Carlo simulations and consideration of requirements for other spin effects studies. The purpose is to have the simple universal detector. SPD-NICA project is under preparation at 2nd interaction point of NICA collider. The purpose of this experiment is the study of the nucleon spin structure with high intensity polarized light nuclear beams using the following planned features of NICA collider: very high collision proton (deuteron) energy up to √ s ∼ 26(12)GeV ; the average luminosity up to 10 30 (10 29 )cm 2 /s both proton and deuteron beams can be effectively polarized, with the polarization degree not less than 50%. We welcome to the collaboration on SPD-NICA project. References [1] P. Abbon et al. (COMPASS collaboration), Nucl. Instrum. Meth. A577 (2007) 455 [2] J. Adams et al. [STAR Collaboration], Phys. Rev. Lett. 92, 171801 (2004) [arXiv:hepex/0310058]. [3] V. Barone et al., PAX Collaboration, ”Antiproton�Proton Scattering Experiments with Polarization”, Julich, April 2005, accessible electronically via http://www.fz� juelich.de/ikp/pax/public files/tp PAX.pdf [4] J. Chiba et al, J�PARC proposal “Measurement of high�mass dimuon production at the 50�GeV proton synchrotron”, can be obtained electronically via http://j� parc.jp/NuclPart/pac 0606/pdf/p04�Peng.pdf [5] A. Sissakian, O. Shevchenko, A. Nagaytsev, O. Denisov, O. Ivanov Eur. Phys. J. C46 (2006) 147 [6] A. Sissakian, O. Shevchenko, A. Nagaytsev, O. Denisov, O. Ivanov Eur. Phys. J. C46 (2006) 147 [7] A. V. Efremov et al, Phys. Lett. B612 (2005) 233 269
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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
Page 220 and 221: higher energies, where the cross se
Page 222 and 223: Figure 3: The experimental results
Page 224 and 225: kinematic range to low values of Bj
Page 226 and 227: 3 Semi-Inclusive DIS Collins and Si
Page 228 and 229: Unpolarized target asymmetries. The
Page 230 and 231: 4 Summary Since the end of data-tak
Page 232 and 233: polarization as well as a construct
Page 234 and 235: Finally the COMPASS reconstruction
Page 236 and 237: tained in the NLO QCD approximation
Page 238 and 239: with only modern NN potential are r
Page 240 and 241: (a) (b) Figure 3: (a) T20 data take
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Page 244 and 245: As is seen in Fig. 1 values of the
Page 246 and 247: SEMI-INCLUSIVE DIS AND TRANSVERSE M
Page 248 and 249: The yellow band in Fig. 1 is the re
Page 250 and 251: At leading twist, a third asymmetry
Page 252 and 253: THE COMPLETION OF SINGLE-SPIN ASYMM
Page 254 and 255: A N , % 30 20 10 0 0 0.2 0.4 0.6 0.
Page 256 and 257: Unexpectedly large single spin asym
Page 258 and 259: THE GENERALIZED PARTON DISTRIBUTION
Page 260 and 261: , E) H ~ (H, I Im C 5 4 3 2 1 Q = 1
Page 262 and 263: Reducing to a common denominator (
Page 264 and 265: LAMBDA PHYSICS AT HERMES S. Belosto
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Page 268 and 269: SPIN PHYSICS AT NICA A. Nagaytsev J
Page 272 and 273: MEASUREMENTS OF TRANSVERSE SPIN EFF
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Page 276 and 277: THE FIRST STAGE OF POLARIZATION PRO
Page 278 and 279: In paper [12] the study was made of
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Page 282 and 283: Table 2: The parameters of the main
Page 284 and 285: POLARIZATION MEASUREMENTS IN PHOTOP
Page 286 and 287: With a polarized electron beam inci
Page 288 and 289: Figure 3: Preliminary helicity asym
Page 290 and 291: INVESTIGATION OF DP-ELASTIC SCATTER
Page 292 and 293: framework with the use of deuteron
Page 294 and 295: SPIN PHYSICS WITH CLAS Y. Prok 12,
Page 296 and 297: 1.3 Flavor Decomposition of the Hel
Page 298 and 299: Γ p 1 0.15 0.125 0.1 0.075 0.05 0.
Page 300 and 301: The upcoming energy upgrade of Jeff
Page 302 and 303: y the nearly 1000 combined citation
Page 304 and 305: � R = −Pt/Pl τ(1 + ε)/2ε; he
Page 306 and 307: 4 Results of GEp-III Experiment In
Page 308 and 309: 6 Theoretical Developments The earl
Page 310 and 311: lz = 0 (along the direction of the
Page 312 and 313: models have recently been challenge
Page 314 and 315: [32] Chung P. L. and F. Coester, Ph
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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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[3] A. Airapetian et al. [HERMES co
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2. Delta-Sigma Experimental Set-up.
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6. Estimate of the count rate in tr
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2 Analysis Formalism Spin-dependent
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The MC production comprises three s
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6 High pT hadron pair analysis for
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[2] V. Y. Alexakhin et al. [COMPASS
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2 Towards polarized Antiprotons For
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4 Spin-Filtering Experiments at COS
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to test the theoretical models of t
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C1 C2 π CH1,2 CH3,4 CH5,6 111 000
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not even resemble the data behavior
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to the slope of the Rosenbluth plot
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The differential cross section of t
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with zero for all mass ranges, with
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more precise and dedicated measurem
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oth types of experiment results are
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is recorded, a good particle identi
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error of the extracted asymmetries
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2.6 Summary and Outlook The first d
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386
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PROTON BEAM POLARIZATION MEASUREMEN
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N A 0.06 0.05 0.04 0.03 0.02 0.01 0
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Intensity profile (arb. units) 1 0.
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[4] H. Okada et al., Proc. of the 1
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The amplitudes of the signals and t
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The following results has been obta
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interaction vanishes and a single Z
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an amorphous NH3 for low and high,
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and depends on a choice of � ℓ1
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3 The conditions for transparent sp
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where angles α and β are defined
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forward angles, where vector Ay and
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espectively. The open symbols repre
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RF dipole (transverse B): εBdl = 1
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i PV / PV i PV / PV 1 0.5 0 -0.5 -1
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The energies of the states Ψ1 −
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field P ≈ +1. If we add the trans
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econstruction provide more accurate
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y detector saturation from pC colli
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2 �p+ 8 He analyzing power measur
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3.3 Effect of valence neutrons on s
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i.e. n0(θ +2π) =n0(θ) . There ar
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w and ˙ɛ. For example, we use par
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436
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REGULARIZATION OF SOURCE OF THE KER
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The corresponding phase transition
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ABOUT SPIN PARTICLE SOLUTION IN BOR
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where the functions fi(s, η) must
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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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