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Spin Physics at IHEP, now and in future. V. Mochalov (for N. Tyurin ). IHEP experimental program. Three main experimental directions: Test of SM and effects beyond SM in charge Kaon rare decays. Hadron spectroscopy Polarization effects. Spin physics at Protvino. - PowerPoint PPT Presentation
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Spin Physics at IHEP, Spin Physics at IHEP, now and in future now and in future
V. Mochalov V. Mochalov (for (for N. TyurinN. Tyurin) )
10 October 200810 October 2008 N. Tyurin, Director's sessionN. Tyurin, Director's session 22
SPIN 2008
IHEP experimental programIHEP experimental program
Three main experimental directions:Three main experimental directions:
Test of SM and effects beyond SM in charge Test of SM and effects beyond SM in charge Kaon rare decays.Kaon rare decays.
Hadron spectroscopyHadron spectroscopy
Polarization effects.Polarization effects.
10 October 200810 October 2008 N. Tyurin, Director's sessionN. Tyurin, Director's session 33
SPIN 2008
Spin physics at ProtvinoSpin physics at Protvino
1968 – first polarization program at IHEP 1968 – first polarization program at IHEP Polarization in elastic scatteringPolarization in elastic scattering
1978 - JINR-IHEP polarized target1978 - JINR-IHEP polarized targetPolarization in charge exchange reactionsPolarization in charge exchange reactionsSingle-spin asymmetry in inclusive production Single-spin asymmetry in inclusive production
of neutral mesons.of neutral mesons.1993 - polarized beam from 1993 - polarized beam from ΛΛ-decay for -decay for
FODS experimentFODS experimentSingle-spin asymmetry in inclusive production Single-spin asymmetry in inclusive production
of charge hadrons.of charge hadrons.
10 October 200810 October 2008 N. Tyurin, Director's sessionN. Tyurin, Director's session 44
SPIN 2008
Current experimentsCurrent experiments FODSFODS experiment to experiment to
study inclusive charge study inclusive charge hadron (hadron (ππ, K, K, p) , p) production.production. Future: study spin effects in Future: study spin effects in
pair production (study pair production (study transversity).transversity).
PROZA-2PROZA-2 experiments – experiments – AANN in in ππ0 0 production in production in polarized target polarized target fragmentation regionfragmentation region Future – new Future – new
SPASCHARM projectSPASCHARM project
π-p↑→π0X
Preliminary, 2008 result
pp↑→π0X,
10 October 200810 October 2008 N. Tyurin, Director's sessionN. Tyurin, Director's session 55
SPIN 2008
New SPASCHARM projectNew SPASCHARM project
Stage 1Stage 1: precise study of single-spin asymmetry in : precise study of single-spin asymmetry in miscellaneous miscellaneous inclusive and exclusive productioninclusive and exclusive production of the of the light light ((u, d, s – quarks) u, d, s – quarks) resonances in the un-polarized resonances in the un-polarized beam fragmentation region.beam fragmentation region. New Setup is under construction to start the experiment in New Setup is under construction to start the experiment in
2011.2011.
Stage 2Stage 2: measurements of double-spin asymmetry A: measurements of double-spin asymmetry ALLLL using both longitudinally polarized proton beam and using both longitudinally polarized proton beam and target in charmonium production to studytarget in charmonium production to study gluon gluon polarization polarization GG//GG((xx)) at large xat large xB B (around 0.3). (around 0.3). A polarized proton beam is required.A polarized proton beam is required.
10 October 200810 October 2008 N. Tyurin, Director's sessionN. Tyurin, Director's session 66
SPIN 2008SPASCHARM Expected accuracy SPASCHARM Expected accuracy
(70 days at the beam)(70 days at the beam) Exclusive charge exchange reactions:Exclusive charge exchange reactions:
--рр↑↑ ω(782) ω(782)nn and and --рр↑↑ ’’(958)(958)nn – 20 times more – 20 times more statistics, statistic errors less than 2%statistics, statistic errors less than 2%
--pp ff22(1270) (1270) nn – 3 times more statistics, statistic – 3 times more statistics, statistic errors about 5%errors about 5%
Inclusive reactions:Inclusive reactions: Asymmetry measurement statistic errors in Asymmetry measurement statistic errors in
reactions reactions --рр↑↑ ω(782) ω(782)X, X, ρρX,X, ’’(958)(958)XX are 0.3 are 0.3÷÷3% 3% for different kinematic intervalsfor different kinematic intervals
Accuracy in the reaction Accuracy in the reaction --pp ff22(1270) (1270) XX is even is even better better (0.1(0.1÷÷1%)1%)
Expected statistic errors in AExpected statistic errors in ANN for the reaction for the reaction --ppff22ХХ for p for pTT>0.5 >0.5 GeV/cGeV/c for 2 detector geometries (20 days for “4m” and 45 days for for 2 detector geometries (20 days for “4m” and 45 days for “7m). Summary statistic error is shown in “7m). Summary statistic error is shown in redred..
ppT,T,GeV/c\GeV/c\ xxFF 0.5-0.60.5-0.6 0.6-0.70.6-0.7 0.7-0.80.7-0.8 0.8-0.90.8-0.9 0.9-1.00.9-1.0
0.50.5-1.-1.00 “ “44m”m” “7m”“7m”
0.20.20.2 0.2 0.10.1
0.30.30.3 0.3 0.20.2
0.30.30.30.3 0.20.2
0.30.30.40.4 0.20.2
0.8 0.8 1.01.0 0.60.6
11..0-1.50-1.5 “ “44m”m” “7m”“7m”
0.30.30.40.4 0.20.2
0.30.30.40.4 0.20.2
0.30.30.50.5 0.30.3
0.40.40.60.6 0.30.3
1.71.71.71.7 1.21.2
11.5.5-2.-2.00 “ “44m”m” “7m”“7m”
0.0.440.6 0.6 0.30.3
0.50.50.7 0.7 0.40.4
0.60.60.8 0.8 0.50.5
1.01.01.01.0 0.70.7
22..0-2.50-2.5 “ “44m”m” “7m”“7m”
0.70.71.4 1.4 0.60.6
0.80.81.31.3 0.70.7
1.11.11.71.7 0.90.9
5.15.17.07.0 4.14.1
10 October 200810 October 2008 N. Tyurin, Director's sessionN. Tyurin, Director's session 77
SPIN 2008SPASCHARM Stage 2SPASCHARM Stage 2
Stage 2Stage 2 with “old” polarized target and without polarized beam: with “old” polarized target and without polarized beam: Single-spin asymmetry Single-spin asymmetry ААNN in in JJ// andand 11//22 inclusive production using pion and inclusive production using pion and
unpolarized proton beam. Expected accuracy (conservative) for 40 days of data unpolarized proton beam. Expected accuracy (conservative) for 40 days of data taking is:taking is:
Statistic error of Statistic error of JJ// asymmetry measurements is asymmetry measurements is 14% 14% forfor -- and and 5% 5% for p beamfor p beam. . The The cross-section ratio for cross-section ratio for 11//22 production will be measured to determine the production will be measured to determine the
mechanism of charmonium productionmechanism of charmonium production. . Stage 2Stage 2 with longitudinally polarized beam and target: with longitudinally polarized beam and target: Main goal of the experiment is to measure double-spin asymmetry AMain goal of the experiment is to measure double-spin asymmetry ALLLL using using
longitudinally polarized proton beam and target in the reactionslongitudinally polarized proton beam and target in the reactionspp + p+ p 22 + X + X andand pp+p+pJ/J/+X +X
GG//GG((xx)) is clearly measured for is clearly measured for 2 2 (J(JPC PC = 2= 2++++). ). Gluon-gluon fusion is supposed to be dominant in Gluon-gluon fusion is supposed to be dominant in 22-production-production. . GG//G G can be measured directly: can be measured directly: AALL LL (x(xFF) = Â) = ÂLL LL * [∆G/G (x* [∆G/G (x11)*)* ∆G/G (x∆G/G (x22)], where)], where ААNNNN measurements for Drell-Yan pairs to study transverslity measurements for Drell-Yan pairs to study transverslity hh((xx)). . SimultaneouslySimultaneously
ААNNNN and and AANN in in JJ//, , 11//22.. production will be studied. production will be studied. Double spin asymmetry measurements at different channelsDouble spin asymmetry measurements at different channels
10 October 200810 October 2008 N. Tyurin, Director's sessionN. Tyurin, Director's session 88
SPIN 2008
Accelerator developmentAccelerator development Current IHEP accelerator activity is to accelerate light Current IHEP accelerator activity is to accelerate light
ions at U70. ions at U70. 22D,D,1212C nuclei are accelerated in 1.5 GeV booster and transported C nuclei are accelerated in 1.5 GeV booster and transported
inside U70 at the injection energy in 2008. inside U70 at the injection energy in 2008.
The project to replace current U-70 magnet by Super The project to replace current U-70 magnet by Super Ferric 100 GeV accelerator is under discussion.Ferric 100 GeV accelerator is under discussion. SF machine design will consider the possibility to accelerate SF machine design will consider the possibility to accelerate
polarized protons.polarized protons.
Polarized beam from Polarized beam from ΛΛ-decays:-decays: FODS-2 experiment uses polarized beam from 1993 (Intensity FODS-2 experiment uses polarized beam from 1993 (Intensity
101088 polarized p/cycles) polarized p/cycles) We are discussing possibility another low intensity polarized We are discussing possibility another low intensity polarized
beam for SPASCHARM experiment (5beam for SPASCHARM experiment (5101066 pol. protons/cycle). pol. protons/cycle).
10 October 200810 October 2008 N. Tyurin, Director's sessionN. Tyurin, Director's session 99
SPIN 2008
SummarySummary IHEP has rich experimental programIHEP has rich experimental program
Single spin asymmetry in different channels (PROZA and FODS Single spin asymmetry in different channels (PROZA and FODS experiment)experiment)
New polarization program:New polarization program: FODS-2 will measure spin effects and correlations in the charge pair FODS-2 will measure spin effects and correlations in the charge pair
hadron inclusive production to study transversity.hadron inclusive production to study transversity. New SPASCHARM experiment will measure asymmetry in New SPASCHARM experiment will measure asymmetry in
miscellaneous exclusive and inclusive channels including charm and DY miscellaneous exclusive and inclusive channels including charm and DY production.production.
We are working to accelerate polarized protons (together with BINP, We are working to accelerate polarized protons (together with BINP, Novosibirsk).Novosibirsk).
Intermediate (40-70 GeV) beam energy is a perfect tool to study Intermediate (40-70 GeV) beam energy is a perfect tool to study polarization effects in miscellaneous reactions polarization effects in miscellaneous reactions
10 October 200810 October 2008 N. Tyurin, Director's sessionN. Tyurin, Director's session 1010
SPIN 2008
Backup slidesBackup slides
10 October 200810 October 2008 N. Tyurin, Director's sessionN. Tyurin, Director's session 1111
SPIN 2008
Polarization (asymmetry) in the charge Polarization (asymmetry) in the charge exchange reactions (PROZA:1978-1988)exchange reactions (PROZA:1978-1988)
π-p↑→π0n, V.D. Apokin et al., Yad.Fiz.45:1355,1987
π-p↑→n, V.D. Apokin et al., Z.Phys.C35:173,1987.
π-p↑→(783)n, I.A. Avvakumov et al. Yad.Fiz.42:1146,1985
π-p↑→f2(1270)n, V.D. Apokin et al. Yad.Fiz.47:727-730,1988]
10 October 200810 October 2008 N. Tyurin, Director's sessionN. Tyurin, Director's session 1212
SPIN 2008Asymmetry in inclusive Asymmetry in inclusive ππ00
production (PROZA-2:1988-2008)production (PROZA-2:1988-2008)pp↑→ π0X, Phys.At.Nucl, 67 (2004) 1487
π-p↑→π0X, Phys.Lett.B243,461 (1990)
π-p↑→π0X, Phys.At.Nucl, 67 (2004) 1495
Preliminary, 2008 result
pp↑→π0X, Presented SPIN2008 first time
10 October 200810 October 2008 N. Tyurin, Director's sessionN. Tyurin, Director's session 1313
SPIN 2008Asymmetry in charge hadronAsymmetry in charge hadron
production (FODS:1993-2008)production (FODS:1993-2008)
10 October 200810 October 2008 N. Tyurin, Director's sessionN. Tyurin, Director's session 1414
SPIN 2008
FODS-2FODS-2 asymmetry measurements in asymmetry measurements in inclusive inclusive chargecharge hadron production hadron production
Experimental setup to Experimental setup to measure charge measure charge hadrons at different hadrons at different anglesangles
Polarized beam from Polarized beam from ΛΛ--decaysdecays
Asymmetry Asymmetry measurements for measurements for ππ,,KK,p,p::
|x|xFF||0.2, 0.50.2, 0.5ррTT4 4 GeV/c,GeV/c, CMCM8686oo
-0.1-0.1xxFF0.7; 0.7; 0.30.3ррTT2.0 GeV/c, 2.0 GeV/c, 1CM1CM 4848oo; ; 2CM2CM105105oo
10 October 200810 October 2008 N. Tyurin, Director's sessionN. Tyurin, Director's session 1515
SPIN 2008
FODS-2 main resultsFODS-2 main results
