References - Bogoliubov Laboratory of Theoretical Physics - JINR

More documents

Recommendations

Info

Unexpectedly large single spin asymmetry in π 0 -production at π − -beam in the central region [16] pointed out that polarization effects are beam quark flavour dependent, since AN in pp↑ interactions is zero at the same energy. Answers and questions instead of Conclusion PROZA experiment found many interesting effects both in exclusive and inclusive reactions. Nevertheless even more questions have to be discussed. Let’s first summarize what we know and what we can not explain in exclusive reactions. • A significant polarization (asymmetry) was found in the all exclusive reactions [12]- [15]. Does the asymmetry magnitude increase with meson mass? • There is an indication on asymmetry oscillations. Is it real effect for all particles? Better accuracy is required. • Polarization changes it’s sign in the dip region on the π − + p↑ → π 0 + n differential cross-section. Is it valid for other reactions? What is the theoretical explanation of this effect? • Simple Regge model can not describe polarization. Modification was required. One of the possible solution is Odderon pole in addition to ρ-pole. There is no predictions for the most of the reactions except π − +p↑ → π 0 +n (see [18] for example). Another interesting prediction is that P (π 0 )+2P (η) =P (η′). It is very interesting also to measure asymmetry in a0(980) production [19]). Similar complicated situation is for inclusive reactions. • Asymmetry mainly does not depend on energy (see also E704, BNL, RHIC data). We have very good possibility to measure asymmetry in different channels at intermediate energies with good accuracy at the SPASCHARM experiment. • A significant asymmetry was found for u− and d− quark particles. The asymmetry is quark flavor dependent (at least for pion and proton beams). The asymmetry in the η-production is bigger than in the π 0 production (see also STAR data). What is the asymmetry for ss − bar and heavier states (φ and others)?. • Asymmetry increases with pT at the central region in the reaction π − +p↑ → π 0 +X Most of the models can not predict non-zero asymmetry in the central region and describe pT behavior. • A threshold effect and a scaling was observed. Asymmetry in the non-polarized beam and in the polarized target (beam) regions close to the edge of phase space are equal each other in the reaction π − +p↑ → π 0 +X It is very important to measure asymmetry in a wide kinematic region in different channels to discriminate between different models. We may conclude that we have found a lot of interesting spin effects. Nevertheless we all have desires, possibilities and duties trying to find much more inviting and unpredictable. 254
Acknowledgement The work was supported by State Atomic Energy Corporation Rosatom with partial support by State Agency for Science and Innovation grant N 02.740.11.0243 and RFBR grants 08-02-90455 and 09-02-00198. References [1] S.B. Nurushev, These Proceedings, p. 278. [2] V.D. Apokin et al., Sov.J.Nucl.Phys. 49 (1989) 103 [Yad.Fiz. 49 (1989) 165]. [3] V.D. Apokin et al., Sov.J.Nucl.Phys. 49 (1989) 97 [Yad.Fiz. 49 (1989) 156]. [4] V.D. Apokin et al., Proc. of the 7th. Int. Spin Physics Symposium V.2 (1987) 93. [5] A.B. Zamolodchikov et al, Sov.J.Nucl.Phys. 26 (1977) [Yad.Fiz. 26 (1977) 399]. [6] A.N. Vasiliev et al., Phys.Atom.Nucl. 67 (2004) 1495 [Yad.Fiz. 67 (2004) 1520]. [7] V.D. Apokin et al., Sov.J.Nucl.Phys. 45 (1987) 840 [Yad.Fiz.45 (1987) 1355]. [8] A.N. Vasiliev et al., Phys.Atom.Nucl. 68 (2005) 1790 [Yad.Fiz. 68 (2005) 1852]. [9] A.N. Vasiliev@ et al., Instrum.Exp.Tech. 50 (2007) 458. [10] D.L. Adams et al., Z.Phys. C56 (1992) 181. [11] B.I. Abelev et al., Phys.Rev.Lett.101 (2008) 222001. [12] V.D. Apokin et al., Sov. J. Nucl. Phys. 45 (1987) 840. [13] V.D. Apokin et al. Yad. Fiz. 47 (1988) 727. [14] V.D. Apokin et al., Z. Phys. C35 (1987) 173. [15] I.A. Avvakumov et al. Yad. Fiz. 42 (1985) 1146. [16] V.D. Apokin et al, Phys. Lett. B243 (1990) 461. [17] A.N. Vasiliev et al, Phys. At. Nucl 67 (2004) 1487. [18] S.V. Goloskokov et al., Z.Phys.C50 (1991) 455. [19] N.N. Achasov, G.N. Shestakov, Phys.Rev.Let 92 (2004) 077503. 255
Page 1:
XIII Advanced Research Workshop on
Page 4 and 5:
ã�� [539.12.01 + 539.12 ... 14
Page 6 and 7:
Analytic perturbation theory and pr
Page 8 and 9:
Measurements of GEp/GMp to high Q 2
Page 11 and 12:
WELCOME ADDRESS Alexei Sissakian Di
Page 13 and 14:
he joined the group of prof. Przemy
Page 15 and 16:
proton. Dividing these 90 ◦ cm p-
Page 17 and 18:
p-p scattering angle fixed at exact
Page 19 and 20:
tuning for each ring. The Workshop
Page 21 and 22:
was only about 10 5 per second, but
Page 23:
[10] E.F. Parker et al., Phys. Rev.
Page 27 and 28:
MICROSCOPIC STERN-GERLACH EFFECT AN
Page 29 and 30:
DeGrand-Miettinen model predicted P
Page 31 and 32:
TOWARDS STUDY OF LIGHT SCALAR MESON
Page 33 and 34:
104xdBR(φ--> π η 0 -1 γ )/dm, G
Page 35 and 36:
RECURSIVE FRAGMENTATION MODEL WITH
Page 37 and 38:
Figure 2: String decaying into pseu
Page 39 and 40:
pT -distributions in the quark frag
Page 41 and 42:
4 Inclusion of spin-1 mesons For a
Page 43 and 44:
CONSTITUENT QUARK REST ENERGY AND W
Page 45 and 46:
〈r 2 ch 〉≈1fm2 . Now with Eqs
Page 47 and 48:
TOWARDS A MODEL INDEPENDENT DETERMI
Page 49 and 50:
Common for the difference cross sec
Page 51 and 52:
TRANSVERSITY GPDs FROM γN → πρ
Page 53 and 54:
The scattering amplitude of the pro
Page 55 and 56:
INFRARED PROPERTIES OF THE SPIN STR
Page 57 and 58:
5 Acknowledgement B.I. Ermolaev is
Page 59 and 60:
We shall call this model the “sec
Page 61 and 62:
y f ν V = f l V = f u V = f d gz V
Page 63 and 64:
2. We remind, that the celebrated G
Page 65 and 66:
of the resonance A, θV � 39 o .
Page 67 and 68:
• Right-handed EW currents. The c
Page 69 and 70:
pesum- (p Entries 0 + pe)-(p-pe) Me
Page 71 and 72:
CROSS SECTIONS AND SPIN ASYMMETRIES
Page 73 and 74:
R(ρ) 5 4 3 2 1 0 2 3 4 5 6 7 8 9 1
Page 75 and 76:
TWO-PHOTON EXCHANGE IN ELASTIC ELEC
Page 77 and 78:
and depend on three parameters : fN
Page 79 and 80:
O(αs) SPIN EFFECTS IN e + e −
Page 81 and 82:
3 Polarization results for mq → 0
Page 83 and 84:
Since one has (↑↓) pc Born =(
Page 85 and 86:
Figure 1: A typical lowest order Fe
Page 87 and 88:
sin φ S (π + ) A UT 1.0 0.8 0.6 0
Page 89 and 90:
form the agreement with these data
Page 91 and 92:
in settling this dynamical issue. G
Page 93 and 94:
SPIN CORRELATIONS OF THE ELECTRON A
Page 95 and 96:
the two-photon system equaling 1).
Page 97 and 98:
ANOTHER NEW TRACE FORMULA FOR THE C
Page 99 and 100:
Compare the gain of time and effort
Page 101 and 102:
where the triplet and octet axial c
Page 103 and 104:
[2] Y. Prok et al. [CLAS Collaborat
Page 105 and 106:
Melosh rotations which boost the re
Page 107 and 108:
ky �GeV� 0.4 0.2 0.0 �0.2 �
Page 109 and 110:
[2] B. Pasquini, and S. Boffi, Phys
Page 111 and 112:
The appearance of both |+〉 and |
Page 113 and 114:
2.2 Intrinsic Transverse Motion Qua
Page 115 and 116:
are still complex: for a given corr
Page 117 and 118:
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 170 and 171:
01 00 11 01 01 01 00 11 01 01 01 00
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
Page 220 and 221: higher energies, where the cross se
Page 222 and 223: Figure 3: The experimental results
Page 224 and 225: kinematic range to low values of Bj
Page 226 and 227: 3 Semi-Inclusive DIS Collins and Si
Page 228 and 229: Unpolarized target asymmetries. The
Page 230 and 231: 4 Summary Since the end of data-tak
Page 232 and 233: polarization as well as a construct
Page 234 and 235: Finally the COMPASS reconstruction
Page 236 and 237: tained in the NLO QCD approximation
Page 238 and 239: with only modern NN potential are r
Page 240 and 241: (a) (b) Figure 3: (a) T20 data take
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 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
Page 266 and 267: analysis was carried out reconstruc
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 276 and 277: THE FIRST STAGE OF POLARIZATION PRO
Page 278 and 279: In paper [12] the study was made of
Page 280 and 281: emphasis to increase the statistics
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
Page 326 and 327:
COMPASS could be converted into a f
Page 328 and 329:
3.1.2 Beam charge and spin asymmetr
Page 330 and 331:
contributions enter only beyond lea
Page 332 and 333:
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 384 and 385:
error of the extracted asymmetries
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
Page 434 and 435:
i.e. n0(θ +2π) =n0(θ) . There ar
Page 436 and 437:
w and ˙ɛ. For example, we use par
Page 438 and 439:
436
Page 441 and 442:
REGULARIZATION OF SOURCE OF THE KER
Page 443 and 444:
The corresponding phase transition
Page 445 and 446:
ABOUT SPIN PARTICLE SOLUTION IN BOR
Page 447 and 448:
where the functions fi(s, η) must
Page 449 and 450:
SPINDYNAMICS I.B. Pestov JINR, 1419
Page 451 and 452:
State of hadron matter is defined t
Page 453 and 454:
REMARK ON SPIN PRECESSION FORMULAE
Page 455 and 456:
It is easy to see that for a (massi
Page 457 and 458:
DYNAMICS OF SPIN IN NONSTATIC SPACE
Page 459 and 460:
Schwinger gauge. Probably for the f
Page 461 and 462:
DSPIN-09 WORKSHOP SUMMARY Jacques S
Page 463 and 464:
to some preliminary results reporte
Page 465 and 466:
A new measurement of the polarizati
Page 467 and 468:
new NLO QCD parametrization of the
Page 469:
Name (Institution, Town, Country) E
show all

References - Bogoliubov Laboratory of Theoretical Physics - JINR

Create successful ePaper yourself

Delete template?

Save as template?