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THE FIRST STAGE OF POLARIZATION PROGRAM SPASCHARM AT THE ACCELERATOR U-70 OF IHEP V.V.Abramov 1 ,N.A.Bazhanov 2 , N.I. Belikov 1 , A.A. Belyaev 3 , A.A. Borisov 1 ,N.S. Borisov 2 , M.A. Chetvertkov 4 , V.A. Chetvertkova 5 , Yu.M. Goncharenko 1 , V.N. Grishin 1 ,A.M.Davidenko 1 , A.A.Derevshchikov 1 ,R.M.Fahrutdinov 1 ,V.A. Kachanov 1 , Yu.D. Karpekov 1 ,Yu.V.Kharlov 1 , V.G. Kolomiets 2 , D.A. Konstantinov 1 ,V.A. Kormilitsyn 1 ,A.B.Lazarev 2 , A.A. Lukhanin 3 , Yu.A. Matulenko 1 , Yu.M. Melnik 1 , A.P. Meshchanin 1 , N.G. Minaev 1 , V.V. Mochalov 1 , D.A. Morozov 1 , A.B. Neganov 2 , L.V. Nogach 1 , S.B. Nurushev 1 † , V.S.Petrov 1 , Yu.A. Plis 2 , A.F. Prudkoglyad 1 , 1 A.V. Ryazantsev 1 ,P.A.Semenov 1 ,V.A.Senko 1 , N.A. Shalanda 1 , O.N. Shchevelev 2 ,L.F. Soloviev 1 , Yu.A. Usov 2 ,A.V.Uzunian 1 , A.N. Vasiliev 1 , V.I.Yakimchuk 1 ,A.E. Yakutin 1 (1) IHEP, Protvino, Russia (2) JINR, Dubna, Russia (3) KhPTI, Kharkov, Ukraine (4) MSU, Physics Department, Moscow, Russia (5) Skobeltsyn INP MSU, Moscow, Russia † E-mail: Sandibek.Nurushev@ihep.ru Abstract The first stage of the proposed polarization program SPASCHARM includes the measurements of the single-spin asymmetry (SSA) in exclusive and inclusive reactions with production of stable hadrons and the light meson and baryon resonances.In this study we foresee of using the variety of the unpolarized beams ( pions, kaons, protons and antiprotons) in the energy range of 30-60 GeV. The polarized proton and deuteron targets will be used for revealing the flavor and isotopic spin dependencies of the polarization phenomena. The neutral and charged particles in the final state will be detected. Introduction In shaping the new polarization program at U-70 we were guided by three conditions: by our own experiences. by theoretical status of subject and the reliability of the new program.As concerns of the first condition one may refer on the comparative study of polarizations in the elastic scattering of particles and antiparticles by using the polarized proton target [1], [2], measurements of the spin transfer tensor [3], [4] (HERA Collaboration), study of the SSA in the exclusive and inclusive charge exchange reactions at 40 GeV/c [5] (PROZA Collaboration), study of polarization effects at 200 GeV/c by using the polarized proton and antiproton beams (E581/E704 Collaboration, FNAL) [6]. The fourth example of polarization data came recently from the STAR Collaboration at energy in the center of mass √ s=200 GeV [7], [8]. 274
The second condition is the status of the relevant theoretical models. Since the energies and transfer momenta with which we are dealing are not large enough, so there is a doubt about the possible application of the perturbative quantum chromodynamics p(QCD). Therefore either the specific models should be used for the interpretation of the experimental data or the general asymptotic predictions might be applied. The third condition is relevant to the reliability of the experiment, that is, availability of robust equipments, manpower, money and other resources. Below we shall briefly describe all these conditions. 1 The preceding study of polarization effects at U70 In 1970-1976 at U70 Collaboration of physicists from Saclay (France), Protvino, Dubna and Moscow (Russia) (HERA Collaboration) had performed the measurements of the polarization parameters P and R (spin rotation parameter) in elastic scattering of particles and antiparticles at ∼ 40 GeV/c by using the polarized proton target. The polarization data are presented in Figure 1 with one panel for pair of particle and antiparticle. In papers [9] and [10]it was considered some consequences of the hypothesis of the approximate γ5 invariance of the strong interactions. According to this hypothesis at high energies and large momentum transfers s, -t ≫ m 2 (m is the mass of the particles involved in reactions) the polarization in any elastic scattering of particles or antiparticles should be equal to zero. From Figure 1 the following results stem out of: 1. polarizations are not zero in reactions induced by pions, protons and antiprotons. It means that the hypothesis of γ5 invariance does not work for that reactions yet, 2. the polarizations are zero for reactions induced by kaons. It means that the hypothesis of γ5 invariance may work in these reactions. But the large error bars in the measured polarizations make this statement doubtful. The future experiments measuring the polarizations in kaon induced elastic scattering with better statistics are needed. For all of above reactions the next comment follows. Though the asymptotic regime was reached for s it’s not fulfilled for t, since for | t |> 1(GeV/c) 2 the experimental errors are large. This is the next item for the future measurements with high statistics. There is a good measurement of the polarization parameter in π ± p, K ± p, pp, ¯pp elastic scattering at 6 GeV/c [11]. In this case the γ5 invariance does not work too for all reactions, exception is ¯pp, where polarization is compatible with zero in small -t region in frame of the large error bars. P 0.1 0.05 0 -0.05 -0.1 0 0.5 1 1.5 2 -t, (GeV/c) 2 P 0.2 0.1 0 -0.1 0 0.5 1 1.5 2 -t, (GeV/c) 2 0.25 P 0 -0.25 -0.5 0 0.25 0.5 0.75 1 -t, (GeV/c) 2 (a) (b) (c) Figure 1: (a) P in elastic scattering: π − p(•) andπ + p(�). (b) P in elastic scattering: K − p(•) and K + p(�) .(c) P in elastic scattering:¯pp(•) andpp(�). 275
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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
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
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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
Page 242 and 243: of electroproduction from polarized
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 270 and 271: original software packages (MC simu
Page 272 and 273: MEASUREMENTS OF TRANSVERSE SPIN EFF
Page 274 and 275: to “near-side” and “away-side
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
Page 316 and 317: 48 ± 3% for two beams. The proton
Page 318 and 319: is constant with cos θ∗ , as exp
Page 320 and 321: In summary, we made measurements on
Page 322 and 323: angle between the direction of the
Page 324 and 325: 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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