References - Bogoliubov Laboratory of Theoretical Physics - JINR

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01 00 11 01 01 01 00 11 01 01 01 00 11 01 01 01 00 11 01 01 01 00 11 01 01 01 00 11 01 1FCH C2 Beam optics here 000000000000000000000000000 111111111111111111111111111 000000000000000000000000000 111111111111111111111111111 X000000000000000000000000000 111111111111111111111111111 000000 111111 000000000000000000000000000 111111111111111111111111111 Y000000000000000000000000000 111111111111111111111111111 000000000000000000000000000 111111111111111111111111111 000000 111111 X000000000000000000000000000 111111111111111111111111111 000000000000000000000000000 111111111111111111111111111 000000000000000000000000000 111111111111111111111111111 000000 111111 000000 111111 000000000000000000000000000 111111111111111111111111111 000000000000000000000000000 111111111111111111111111111 000000000000000000000000000 111111111111111111111111111 000000 111111 000000000000000000000000000 111111111111111111111111111 000000000000000000000000000 111111111111111111111111111 000000000000000000000000000 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1111111111111111111111111111 000000000000000000000000000 111111111111111111111111111 000000000000000000000000000 111111111111111111111111111 000000 11111100000 11111 0000000000000000000000000000 1111111111111111111111111111 000000000000000000000000000 111111111111111111111111111 000000000000000000000000000 111111111111111111111111111 000000 111111 0000000000000000000000000000 1111111111111111111111111111 000000000000000000000000000 111111111111111111111111111 000000000000000000000000000 111111111111111111111111111 000000 111111 000000 111111 0000000000000000000000000000 1111111111111111111111111111 000000000000000000000000000 111111111111111111111111111 000000000000000000000000000 111111111111111111111111111 000000 111111 H2 0000000000000000000000000000 1111111111111111111111111111 000000000000000000000000000 111111111111111111111111111 000000000000000000000000000 111111111111111111111111111 000000 111111 000000 111111 0000000000000000000000000000 1111111111111111111111111111 000000000000000000000000000 111111111111111111111111111 000000000000000000000000000 111111111111111111111111111 000000 111111 000000 111111 0000000000000000000000000000 1111111111111111111111111111 X 000000000000000000000000000 111111111111111111111111111 000000000000000000000000000 111111111111111111111111111 Y 000000 111111 000000000000000000000000000 111111111111111111111111111 000000000000000000000000000 111111111111111111111111111 X 000000 111111 000000000000000000000000000 111111111111111111111111111 1 DC3 DC2 DC1 DC4 DC5 DC6 DC7 DC8 135cm 135cm Not to scale 17 34 18 Figure 1: Experimental layout for π − p elastic scattering. state was found in η-photoproduction on deuteron in GRAAL [9] and some other experiments. The structure observed has mass 1685 MeV and width < 30 MeV, which was determined by the detector resolution. Our idea is to search for P11(1700) in formation-type experiment on a pion beam [10]. Precise measurement of the beam momentum and fair statistics will allow us to do a scan with unprecedented invariant mass resolution. We plan to measure differential cross sections of the reactions π − p → π − p and π − p → K 0 S Λ0 with high statistics and better than a MeV invariant mass resolution. If the resonance does exist our experiment will provide statistically significant result and we will measure its width with the precision better than 0.7 MeV. The layout dedicated to the elastic scattering measurement is shown in fig. 1. The main parts are: proportional chambers (1FCH and 2FCH), drift chambers (DC1-8), liquid hydrogen target (LqH2), scintillation counters (C1, C2 and A1) and two scintillation hodoscopes (H1 and H2). Proportional chambers are placed in the 1 st and 2 nd focuses of the beam. The chambers are two-coordinate, have square sensitive region of 200×200 mm 2 , 1 mm signal wires pitch, 40 um aluminum foil cathode electrodes and 6 mm between the foils. We use ”magic” gas mixture (argon-isobutane-freon) to feed the proportional chambers. Beam tests showed efficiency better than 99%. Main task of the chambers in the 1 st focus is to measure the momentum of each pion going to the target. Strong dipole magnets between the internal target and the 1 st focus provide horizontal distribution of the particles with different momentum with dispersion 57 mm/%. A distribution over horizontal coordinate in the 1 st focus of the events of scattering of the internal beam protons with momentum 1.0 GeV/c over a beryllium 168
internal target is shown in fig. 2. The peaks observed in the picture correspond to (right to left) the elastic scattering, the first excitation of beryllium nucleus and the second and the third excitations seen as one peak. The liquid hydrogen target has a mylar cylinder container with diameter 40 mm and the length about 250 mm placed in high vacuum inside beryllium outer shell 1 mm thick. It is connected by two pipes to the liquefier system. One is used for liquid hydrogen inflow and through the other the evaporated gas gets back to liquefier. This design provides minimum of matter for the particles. The refrigeration is provided by liquid helium, which flow is controlled by the feedback supporting constant pressure of the hydrogen in the closed vol- X - distribution focus 1 at given Z 35000 30000 25000 20000 15000 10000 5000 Entries 1362633 2 χ / ndf 323.4 / 96 Const1 7980 ± 28.7 X1 -32.82 ± 0.12 Sigma1 24.72 ± 0.08 Const2 1.662e+04 ± 3.509e+02 X2 -5.455 ± 0.333 Sigma2 9.562 ± 0.146 Const3 2.452e+04 ± 6.236e+02 X3 8.051 ± 0.108 Sigma3 7.278 ± 0.045 0 -100 -80 -60 -40 -20 0 20 40 60 80 100 Figure 2: Horizontal distribution in the first focus of internal the accelerator beam protons scattered over internal beryllium target. ume. This pressure corresponds to proper ratio between liquid and gas fractions of the hydrogen and thus ensuring that the liquid occupies whole target working volume and that the hydrogen is not frozen. Pressures and temperatures in the target system are monitored and logged. There are 8 one coordinate drift chambers in the elastic setup. 6 chambers have sensitive region 1200×800 mm 2 and for 2 chambers closest to the target it is 600×400 mm 2 . The chambers have double sensitive layers hexagonal structure shown in fig. 3. Comparing to the conventional drift tubes this structure has much more complex fields, but provides significantly less amount of matter on the particle path. Potential wires form nearly regular hexagon with a side of 10 mm. Drift chambers are fed with 70% Ar and 30% CO2 gas mixture. Beam tests showed better than 99% single layer efficiency and about 0.2 mm resolution. Mylar A unique distributed DAQ system based on the commercial 480 Mbit/s USB 2.0 interface was designed for the experiment [11]. It consists of 100-channel boards for proportional chambers and 24-channel boards for drift chambers, placed on the chambers frames. Each board is connected by two cables (USB 2.0 and power) to the communication box, placed near the chamber. Then the data is trans- 5 5 5 5 5 5 5 5 5 80 17 8.5 Potential plane − ground Potential plane − HV Potential plane − HV Signal plane I − ground Potential plane − HV Potential plane − HV Signal plane II − ground Potential plane − HV Potential plane − HV Potential plane −ground Figure 3: Drift chamber cross section. View along the wires. ferred to the main DAQ computer by the standard TCP/IP connection. Trigger logic is capable of processing of several trigger conditions firing different sets of detectors. During the engineering run last December and the first physics run in April this year the main trigger was set as: T = C1 · C2 · M1FCH · M2FCH · A1 169 Mylar
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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
Page 119 and 120: [16] P.G. Ratcliffe and O.V. Teryae
Page 121 and 122: Figure 1: a)[left] μpG p E /Gp M (
Page 123 and 124: 4 Conclusion We introduced a simple
Page 125 and 126: √ δΔq8 x for Δq8 and γΔGx fo
Page 127 and 128: understanding of polarized light qu
Page 129 and 130: They are inverse powers of Q 2 kine
Page 131 and 132: accounts approximately for the TM a
Page 133 and 134: POTENTIAL FOR A NEW MUON g-2 EXPERI
Page 135 and 136: When the momentum increases (p >p0)
Page 137 and 138: EVOLUTION EQUATIONS FOR TRUNCATED M
Page 139 and 140: 4 Perspectives Evolution equations
Page 141 and 142: NEW DEVELOPMENTS IN THE QUANTUM STA
Page 143 and 144: statistical approach compared to th
Page 145 and 146: POLARIZED HADRON STRUCTURE IN THE V
Page 147 and 148: g 3 A =Δuv(Q 2 ) − Δdv(Q 2 ), g
Page 149 and 150: AXIAL ANOMALIES, NUCLEON SPIN STRUC
Page 151 and 152: 3. Vector current of strange quarks
Page 153 and 154: ORBITAL MOMENTUM EFFECTS DUE TO A L
Page 155 and 156: The elastic scattering S-matrix in
Page 157 and 158: IDENTIFICATION OF EXTRA NEUTRAL GAU
Page 159 and 160: for final l + l − events (l = μ,
Page 161 and 162: QUARK INTRINSIC MOTION AND THE LINK
Page 163 and 164: where wP = − m 2M 2 −p1 cos ω
Page 165 and 166: where g q 2x − ξ 1(x, pT )= πM2
Page 167: EXPERIMENTAL RESULTS
Page 172 and 173: where C1, C2 and A1 - signals from
Page 174 and 175: Figure 1: Layout of experiment targ
Page 176 and 177: According to requirements of the de
Page 178 and 179: Electron energy is measured at ATLA
Page 180 and 181: Fig. 2 shows the results of the lon
Page 182 and 183: e γ* e’ x+ ξ x− ξ A A’ e e
Page 184 and 185: cos 0φ C A φ cos C A cos 2φ C A
Page 186 and 187: 5 Summary HERMES has measured signi
Page 188 and 189: (1.205 ± 0.0012) GeV/c, 10 10 p/s,
Page 190 and 191: was done in the interval ”−t”
Page 192 and 193: If we admit a non-zero quark transv
Page 194 and 195: which is trivial in collinear LO ap
Page 196 and 197: In figure 3 the expected errors on
Page 198 and 199: [12] A. V. Efremov and O. V. Teryae
Page 200 and 201: Figure 1: The COMPASS spectrometer.
Page 202 and 203: Comparing this formula to the inclu
Page 204 and 205: Figure 5: Comparison of COMPASS inc
Page 206 and 207: [9] B. Adeva et al. (SMC Coll.), Ph
Page 208 and 209: q T sin( φ-φ ) M AUT 0.14 0.12 0.
Page 210 and 211: proton beam is planned. References
Page 212 and 213: Run Year √ s (GeV) Polarization R
Page 214 and 215: ackground fraction, and asymmetry i
Page 216 and 217: At √ s = 200 GeV, ALL(pp → π
Page 218 and 219: [6] D. de Florian, W. Vogelsang, an
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higher energies, where the cross se
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Figure 3: The experimental results
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kinematic range to low values of Bj
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3 Semi-Inclusive DIS Collins and Si
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Unpolarized target asymmetries. The
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4 Summary Since the end of data-tak
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polarization as well as a construct
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Finally the COMPASS reconstruction
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tained in the NLO QCD approximation
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with only modern NN potential are r
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(a) (b) Figure 3: (a) T20 data take
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of electroproduction from polarized
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As is seen in Fig. 1 values of the
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SEMI-INCLUSIVE DIS AND TRANSVERSE M
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The yellow band in Fig. 1 is the re
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At leading twist, a third asymmetry
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THE COMPLETION OF SINGLE-SPIN ASYMM
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A N , % 30 20 10 0 0 0.2 0.4 0.6 0.
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Unexpectedly large single spin asym
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THE GENERALIZED PARTON DISTRIBUTION
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, E) H ~ (H, I Im C 5 4 3 2 1 Q = 1
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Reducing to a common denominator (
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LAMBDA PHYSICS AT HERMES S. Belosto
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analysis was carried out reconstruc
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SPIN PHYSICS AT NICA A. Nagaytsev J
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original software packages (MC simu
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MEASUREMENTS OF TRANSVERSE SPIN EFF
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to “near-side” and “away-side
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THE FIRST STAGE OF POLARIZATION PRO
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In paper [12] the study was made of
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emphasis to increase the statistics
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Table 2: The parameters of the main
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POLARIZATION MEASUREMENTS IN PHOTOP
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With a polarized electron beam inci
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Figure 3: Preliminary helicity asym
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INVESTIGATION OF DP-ELASTIC SCATTER
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framework with the use of deuteron
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SPIN PHYSICS WITH CLAS Y. Prok 12,
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1.3 Flavor Decomposition of the Hel
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Γ p 1 0.15 0.125 0.1 0.075 0.05 0.
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The upcoming energy upgrade of Jeff
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y the nearly 1000 combined citation
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� R = −Pt/Pl τ(1 + ε)/2ε; he
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4 Results of GEp-III Experiment In
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6 Theoretical Developments The earl
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lz = 0 (along the direction of the
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models have recently been challenge
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[32] Chung P. L. and F. Coester, Ph
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48 ± 3% for two beams. The proton
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is constant with cos θ∗ , as exp
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In summary, we made measurements on
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angle between the direction of the
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The sensitivity of the data to the
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COMPASS could be converted into a f
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3.1.2 Beam charge and spin asymmetr
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contributions enter only beyond lea
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References [1] D. Mueller et al, Fo
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l’ l p q p h H (z) 1 h (x) 1 l l
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3. Data selection. The data selecti
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φ sin3 a 0.06 0.04 0.02 0 -0.02 -0
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TRANSVERSE SPIN AND MOMENTUM EFFECT
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model. Both the cos φh and the cos
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D cos φ A 0 -0.1 -0.2 -0.3 + h -2
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4.3 The Sivers asymmetry According
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[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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