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error of the extracted asymmetries to their variation. The results are compatible, so no systematic error was assigned. For the interpretation of the results the respective fraction of processes contributing to the asymmetries are very important. These have been estimated from Monte Carlo simulations and are shown in fig. 2. It is evident that the contribution from Υ decays has been almost eliminated by the thrust cut. There are also marginal contributions from τ pairs. For these the false asymmetries are compatible with zero and they have been added with their statistical error to the overall systematic error. Besides the contribution from light quark pairs there is a considerable contribution from charm quarks. This contributions decreases with increasing z which can be understood, since charmed mesons have to undergo an additional decay before they can contribute to the pion asymmetries. This decay can also cause the invariant mass dependence namely a general decrease with higher masses. However, the highest bin shows a very high charm contribution, in some bins more than half of the events, which is not yet understood. The asymmetry results for these bins indicate that the IFF for charm quarks is non-vanishing and of similar magnitude as that of lighter quarks. Backgrounds Backgrounds Backgrounds 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.20 < z < 0.28 2 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 z1 0.42 < z < 0.50 2 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 z1 0.65 < z < 0.72 2 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 z1 Backgrounds Backgrounds Backgrounds 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.28 < z < 0.35 2 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 z1 0.50 < z < 0.57 2 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 z1 0.72 < z < 0.82 2 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 z1 Backgrounds Backgrounds Backgrounds 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.35 < z < 0.42 2 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 z1 0.57 < z < 0.65 2 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 z1 0.82 < z < 1.00 2 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 z1 Backgrounds Backgrounds Backgrounds 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.25 < m < 0.40 2 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 m1 0.62 < m < 0.77 2 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 m1 1.10 < m < 1.50 2 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 m1 Backgrounds Backgrounds Backgrounds 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.40 < m < 0.50 2 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 m1 0.77 < m < 0.90 2 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 m1 1.50 < m < 2.00 2 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 m1 (a) (b) Backgrounds Backgrounds 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.50 < m < 0.62 2 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 m1 0.90 < m < 1.10 2 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 m1 Figure 2: Relative process contributions from light quark-anti quark events (red), charm events (green), charged B meson pairs (blue), neutral B meson pairs (yellow) and τ pairs (purple) as a function of z2 for all z1 bins (a) and as a function of m2 for all m1 bins (b) 2.5 Results The results obtained for the a12 asymmetry as defined in eq. 2 are shown in figs. 3 binned in the invariant masses m1, m2 of the hadrons pairs in the first and second hemisphere and their fractional energies z1, z2, respectively. Table 3 shows the integrated asymmetries and the averaged kinematic observables. The extracted asymmetries are large, especially when considering that a product of the IFF for quark and anti quarks is measured. As expected the magnitude of the effect rises with z. However, the invariant mass behavior does not match model predictions from [15]. But these model predictions are only available in leading order and heavily dependent on simulations which were tuned for the SIDIS experiment HERMES at a center of mass energy of roughly 7 GeV. The asymmetries rise up to around the mass of the ρ but then plateau instead of decreasing again. A 382
sign change of the IFF can therefore not be confirmed. However bins with high invariant masses receive also considerable contributions from charm quarks as shown before. 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -0.1 0.20 < z < 1.00, 0.20 < z < 1.00 1 2 -0.12 -0.14 2 2 0.25 GeV/c < m < 0.40 GeV/c 2 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 m [GeV/c] 1 12 a 12 a 12 a 12 a 12 a 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -0.1 -0.12 -0.14 2 0.62 GeV/c < m2 2 12 a 12 a 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -0.1 -0.12 -0.14 0.02 0 -0.04 -0.06 -0.1 -0 -0.12 0.12 2 2 0.40 GeV/c < m < 0.50 GeV/c 2 0.2 0.4 0.6 0.8 1 1.2 1.4 0.2 0.40.6 0.8 1 1.2 1.4 1.6 8 0.4 0.6 0 0.8 1.2 1.4 1.6 1.8 m 1 2 m 1 [GeV/c] 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -0.1 -0.12 -0.14 2 1.10 GeV/c m2 2 0.2 0.40.6 0.8 1 1.2 1.4 1.6 1 8 2 m [GeV/c] 1 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -0.1 -0.12 -0.14 2 0.25 GeV/c < m1 < 2.00 GeV/c 0.20 < z < 0.28 2 2 , 0.25 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 z1 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -0.1 -0.12 -0.14 0.42 < z < 0.50 2 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 z z1 12 a 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -0.1 -0.12 -0.14 0.65 < z < 0.72 2 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 z1 12 a 12 a 0.04 0 2 2 0.77 GeV/c < m < 0.90 GeV/c 2 -0.04 -0.06 -0.08 -0.1 -0.12 -0.14 2 2 1.50 GeV/c < m2 < 2.00 GeV/c 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 m [GeV/c] 1 (a) 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -0.1 -0.12 -0.14 0.28 < z < 0.35 2 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 z 1 12 a a 12 0.04 0.02 0 -0.02 -0.1 -0.12 -0.1 0.50 .50 < z < 0.57 2 0 -0.02 -0.06 -0.08 -0.12 -0.14 0.2 0.3 0. 0.5 0.6 0.7 0.8 0.9 z1 0.72 < z < 0.82 2 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 z1 (b) 1 12 a a 122 12 a a 12 12 a 0.04 0.02 0 -0.04 -0.06 2 2 < m < 0.62 GeV/c 2 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 m [GeV/c] 1 0.04 0.02 -0.04 -0.06 -0.08 -0.1 -0.12 -0.14 2 2 0.90 GeV/c < m < 1.10 GeV/c 2 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 m 1 [GeV/c] 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -0.1 -0.1 0.12 -0.14 0.35 < z < 0.42 2 0.2 0.3 0. .4 0.5 0.6 0.7 0.8 0.9 z1 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -0.1 -0.12 -0.14 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -0.1 -0.12 -0.14 0.57 < z < 0.65 2 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 z1 0.82 < z < 1.00 2 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 z1 Figure 3: Results for the a12 modulations in a symmetric 8 × 8 binning in m1, m2 for m {1,2} between 0.25 GeV and 2 GeV (a) and for a symmetric 9 × 9 binning in z1, z2 for z {1,2} between0.2and1(b). The statistical error is shown in blue, the systematic error in green 383
Page 1:
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
Page 334 and 335: l’ l p q p h H (z) 1 h (x) 1 l l
Page 336 and 337: 3. Data selection. The data selecti
Page 338 and 339: φ sin3 a 0.06 0.04 0.02 0 -0.02 -0
Page 340 and 341: TRANSVERSE SPIN AND MOMENTUM EFFECT
Page 342 and 343: model. Both the cos φh and the cos
Page 344 and 345: D cos φ A 0 -0.1 -0.2 -0.3 + h -2
Page 346 and 347: 4.3 The Sivers asymmetry According
Page 348 and 349: [3] A. Airapetian et al. [HERMES co
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
Page 356 and 357: The MC production comprises three s
Page 358 and 359: 6 High pT hadron pair analysis for
Page 360 and 361: [2] V. Y. Alexakhin et al. [COMPASS
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
Page 370 and 371: not even resemble the data behavior
Page 372 and 373: to the slope of the Rosenbluth plot
Page 374 and 375: The differential cross section of t
Page 376 and 377: with zero for all mass ranges, with
Page 378 and 379: more precise and dedicated measurem
Page 380 and 381: oth types of experiment results are
Page 382 and 383: is recorded, a good particle identi
Page 386 and 387: 2.6 Summary and Outlook The first d
Page 388 and 389: 386
Page 391 and 392: PROTON BEAM POLARIZATION MEASUREMEN
Page 393: N A 0.06 0.05 0.04 0.03 0.02 0.01 0
Page 396 and 397: Intensity profile (arb. units) 1 0.
Page 398 and 399: [4] H. Okada et al., Proc. of the 1
Page 400 and 401: The amplitudes of the signals and t
Page 402 and 403: The following results has been obta
Page 404 and 405: interaction vanishes and a single Z
Page 406 and 407: an amorphous NH3 for low and high,
Page 408 and 409: and depends on a choice of � ℓ1
Page 410 and 411: 3 The conditions for transparent sp
Page 412 and 413: where angles α and β are defined
Page 414 and 415: forward angles, where vector Ay and
Page 416 and 417: espectively. The open symbols repre
Page 418 and 419: RF dipole (transverse B): εBdl = 1
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 −
Page 424 and 425: field P ≈ +1. If we add the trans
Page 426 and 427: econstruction provide more accurate
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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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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