References - Bogoliubov Laboratory of Theoretical Physics - JINR

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[2] V. Y. Alexakhin et al. [COMPASS Collaboration], Phys. Lett. B 647 (2007) 8. [3] J. Ashman et al. [European Muon Collaboration], Phys. Lett. B 206 (1988) 364. J. Ashman et al. [European Muon Collaboration], Nucl. Phys. B 328 (1989) 1. K. Abe et al. [E154 Collaboration], Phys. Rev. Lett. 79 (1997) 26 [arXiv:hepex/9705012]. K. Abe et al. [E143 collaboration], Phys. Rev. D 58, (1998) 112003 [arXiv:hepph/9802357]. P. L. Anthony et al. [E142 Collaboration], Phys. Rev. D 54, (1996) 6620 [arXiv:hepex/9610007]. D. Adams et al. [Spin Muon Collaboration (SMC)], Phys. Rev. D 56 (1997) 5330 [arXiv:hep-ex/9702005]. A. Airapetian et al. [HERMES Collaboration], Phys. Lett. B 442 (1998) 484 [arXiv:hep-ex/9807015]. [4] http://theor.jinr.ru/∼spin/2009/spin09talks/1.09 Afternoon/silva.pdf. [5] M. Alekseev et al. [COMPASS collaboartion], Eur. Phys. J. C 52 (2007) 255. [6] R. Brun et al., CERN Program Library W5013 (1994). [7] G. Ingelman, A. Edin and J. Rathsman, Comput. Phys. Commun. 101 (1997) 108 [arXiv:hep-ph/9605286]. [8] A. D. Martin, W. J. Stirling and R. S. Thorne, Phys. Lett. B 636 (2006) 259 [arXiv:hep-ph/0603143]. [9] B. Andresson, The Lund model (Cambridge Univ. Press , Cambridge, 1989). [10] T. Sjostrand, Comput. Phys. Commun. 39 (1986) 347. [11] R. Sulej, K. Zaremba, K. Kurek and E. Rondio, Measur. Sci. Tech. 18 (2007) 2486. [12] T. Sjostrand, P. Eden, C. Friberg, L. Lonnblad, G. Miu, S. Mrenna and E. Norrbin, Comput. Phys. Commun. 135 (2001) 238 [arXiv:hep-ph/0010017]. [13] E. S. Ageev et al. [COMPASS Collaboration], Phys. Lett. B 633 (2006) 25 [arXiv:hepex/0511028]. [14] B. Adeva et al. [SMC],Phys.Rev.D70 (2004) 012002. [15] A. Airapetian et al. [HERMES collaboration], Phys. Rev. Lett. 84 (2000) 2584. 358
STATUS OF THE PAX EXPERIMENT Erhard Steffens 1 † , For the PAX Collaboration 2 (1) University of Erlangen-Nürnberg (2) www.fz-juelich.de/ikp/pax/ † E-mail: steffens@physik.uni-erlangen.de Abstract The PAX experiment aims at the production of a spin-polarized antiproton beam by means of Spin-Filtering, and the study of the spin-dependent pp cross sections. The PAX collaboration is preparing for detailed investigations of the spin-filtering process of protons at COSY (FZ Jülich) and of antiprotons at the AD (CERN). The physics program with polarized antiprotons includes the study of the Drell-Yan process as a direct measurement of transversity, a leading twist structure function of the nucleon. In the talk, a recent measurement of the depolarization of an initially polarized proton beam by co-moving electrons at low relative velocity is presented. Implications for the role of electrons in the polarization buildup of a stored proton beam are discussed. 1 The PAX experiment There is consensus that the QCD physics potential of experiments with high energy polarized antiprotons would be enormous, but up to now high–luminosity experiments were not possible. The situation would change dramatically with the production of stored polarized antiproton beams, and the subsequent realization of a double–polarized high–luminosity antiproton–proton collider. The list of fundamental physics issues to be addressed with such a collider includes the measurement of transversity, the quark transverse polarization inside a transversely polarized proton, which constitutes the last missing leading twist piece of the QCD description of the partonic structure of the nucleon. The transversity can be directly accessed only via double–polarized antiproton–proton Drell–Yan production. It should be noted, that without a measurement of the transversity, our knowledge of the the spin structure of the proton will remain incomplete. Other items of interest are the measurement of the phases of the timelike form factors of the proton, and double–polarized hard antiproton–proton scattering. The PAX collaboration (Polarized Antiproton eXperiments) has formulated its ambitious physics program [1]. A Technical Proposal [2] has been submitted for the new Facility for Antiproton and Ion Research (FAIR) to be built at GSI in Darmstadt, Germany. The uniqueness and the strong scientific merits that would become available with the advent of stored beams of polarized antiprotons have been well received [3], and there is now an urgency to convincingly demonstrate experimentally that a high degree of antiproton beam polarization can be reached. The suggested collider aims at luminosities in excess of 10 31 cm −2 s −1 . An integral part of such a machine is a dedicated large–acceptance Antiproton Polarizer Ring (APR) [4], for which a basic design has been developed [5]. 359
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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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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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Page 328 and 329: 3.1.2 Beam charge and spin asymmetr
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Page 332 and 333: References [1] D. Mueller et al, Fo
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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
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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 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
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Page 382 and 383: is recorded, a good particle identi
Page 384 and 385: error of the extracted asymmetries
Page 386 and 387: 2.6 Summary and Outlook The first d
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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
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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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