Spin Physics at IHEP, now and in future V. Mochalov (for N. Tyurin)

SPIN October 2008N. Tyurin, Director's session2 IHEP experimental program Three main experimental directions: Three main experimental directions: Test of SM and effects beyond SM in charge Kaon rare decays. Test of SM and effects beyond SM in charge Kaon rare decays. Hadron spectroscopy Hadron spectroscopy Polarization effects. Polarization effects.

SPIN October 2008N. Tyurin, Director's session3 Spin physics at Protvino 1968 – first polarization program at IHEP 1968 – first polarization program at IHEP Polarization in elastic scattering Polarization in elastic scattering JINR-IHEP polarized target JINR-IHEP polarized target Polarization in charge exchange reactions Polarization in charge exchange reactions Single-spin asymmetry in inclusive production of neutral mesons. Single-spin asymmetry in inclusive production of neutral mesons polarized beam from Λ-decay for FODS experiment polarized beam from Λ-decay for FODS experiment Single-spin asymmetry in inclusive production of charge hadrons. Single-spin asymmetry in inclusive production of charge hadrons.

SPIN October 2008N. Tyurin, Director's session4 Current experiments FODS experiment to study inclusive charge hadron (π , K , p) production. FODS experiment to study inclusive charge hadron (π , K , p) production. Future: study spin effects in pair production (study transversity). PROZA-2 experiments – A N in π 0 production in polarized target fragmentation region PROZA-2 experiments – A N in π 0 production in polarized target fragmentation region Future – new SPASCHARM project π-p↑→π0Xπ-p↑→π0X Preliminary, 2008 result pp ↑ →π 0 X,

SPIN October 2008N. Tyurin, Director's session5 New SPASCHARM project Stage 1: precise study of single-spin asymmetry in miscellaneous inclusive and exclusive production of the light (u, d, s – quarks) resonances in the un-polarized beam fragmentation region. Stage 1: precise study of single-spin asymmetry in miscellaneous inclusive and exclusive production of the light (u, d, s – quarks) resonances in the un-polarized beam fragmentation region. New Setup is under construction to start the experiment in New Setup is under construction to start the experiment in Stage 2: measurements of double-spin asymmetry A LL using both longitudinally polarized proton beam and target in charmonium production to study gluon polarization  G/G( x ) at large x B (around 0.3). Stage 2: measurements of double-spin asymmetry A LL using both longitudinally polarized proton beam and target in charmonium production to study gluon polarization  G/G( x ) at large x B (around 0.3). A polarized proton beam is required. A polarized proton beam is required.

SPIN October 2008N. Tyurin, Director's session6 SPASCHARM Expected accuracy (70 days at the beam) Exclusive charge exchange reactions: Exclusive charge exchange reactions:  - р ↑  ω(782)n and  - р ↑   ’(958)n – 20 times more statistics, statistic errors less than 2%  - р ↑  ω(782)n and  - р ↑   ’(958)n – 20 times more statistics, statistic errors less than 2%  - p   f 2 (1270) n – 3 times more statistics, statistic errors about 5%  - p   f 2 (1270) n – 3 times more statistics, statistic errors about 5% Inclusive reactions: Inclusive reactions: Asymmetry measurement statistic errors in reactions  - р ↑  ω(782)X, ρX,  ’(958)X are 0.3÷3% for different kinematic intervals Asymmetry measurement statistic errors in reactions  - р ↑  ω(782)X, ρX,  ’(958)X are 0.3÷3% for different kinematic intervals Accuracy in the reaction  - p   f 2 (1270) X is even better (0.1÷1%) Accuracy in the reaction  - p   f 2 (1270) X is even better (0.1÷1%) Expected statistic errors in A N for the reaction  - p  f 2 Х for p T >0.5 GeV/c for 2 detector geometries (20 days for “4m” and 45 days for “7m). Summary statistic error is shown in red. p T, GeV/c\ x F “4m” “7m” “4m” “7m” “4m” “7m” “4m” “7m”

SPIN October 2008N. Tyurin, Director's session7 SPASCHARM Stage 2 Stage 2 with “old” polarized target and without polarized beam: Stage 2 with “old” polarized target and without polarized beam: Single-spin asymmetry А N in J/  and  1 /  2 inclusive production using pion and unpolarized proton beam. Expected accuracy (conservative) for 40 days of data taking is: Single-spin asymmetry А N in J/  and  1 /  2 inclusive production using pion and unpolarized proton beam. Expected accuracy (conservative) for 40 days of data taking is: Statistic error of J/  asymmetry measurements is 14% for  - and 5% for p beam. Statistic error of J/  asymmetry measurements is 14% for  - and 5% for p beam. The cross-section ratio for  1 /  2 production will be measured to determine the mechanism of charmonium production. The cross-section ratio for  1 /  2 production will be measured to determine the mechanism of charmonium production. Stage 2 with longitudinally polarized beam and target: Stage 2 with longitudinally polarized beam and target: Main goal of the experiment is to measure double-spin asymmetry A LL using longitudinally polarized proton beam and target in the reactions Main goal of the experiment is to measure double-spin asymmetry A LL using longitudinally polarized proton beam and target in the reactions p  + p    2 + X and p  +p   J/  +X  G/G(x) is clearly measured for  2 (J PC = 2 ++ ).  G/G(x) is clearly measured for  2 (J PC = 2 ++ ). Gluon-gluon fusion is supposed to be dominant in  2 -production.  G/G can be measured directly: A LL (x F ) = Â LL * [∆G/G (x 1 )* ∆G/G (x 2 )], where А NN measurements for Drell-Yan pairs to study transverslity h(x). Simultaneously А NN and A N in J/ ,  1 /  2. production will be studied. А NN measurements for Drell-Yan pairs to study transverslity h(x). Simultaneously А NN and A N in J/ ,  1 /  2. production will be studied. Double spin asymmetry measurements at different channels Double spin asymmetry measurements at different channels

SPIN October 2008N. Tyurin, Director's session8 Accelerator development Current IHEP accelerator activity is to accelerate light ions at U70. Current IHEP accelerator activity is to accelerate light ions at U70. 2 D, 12 C nuclei are accelerated in 1.5 GeV booster and transported inside U70 at the injection energy in D, 12 C nuclei are accelerated in 1.5 GeV booster and transported inside U70 at the injection energy in The project to replace current U-70 magnet by Super Ferric 100 GeV accelerator is under discussion. The project to replace current U-70 magnet by Super Ferric 100 GeV accelerator is under discussion. SF machine design will consider the possibility to accelerate polarized protons. SF machine design will consider the possibility to accelerate polarized protons. Polarized beam from Λ-decays: Polarized beam from Λ-decays: FODS-2 experiment uses polarized beam from 1993 (Intensity 10 8 polarized p/cycles) FODS-2 experiment uses polarized beam from 1993 (Intensity 10 8 polarized p/cycles) We are discussing possibility another low intensity polarized beam for SPASCHARM experiment (5  10 6 pol. protons/cycle). We are discussing possibility another low intensity polarized beam for SPASCHARM experiment (5  10 6 pol. protons/cycle).

SPIN October 2008N. Tyurin, Director's session9 Summary IHEP has rich experimental program IHEP has rich experimental program Single spin asymmetry in different channels (PROZA and FODS experiment) Single spin asymmetry in different channels (PROZA and FODS experiment) New polarization program: New polarization program: FODS-2 will measure spin effects and correlations in the charge pair hadron inclusive production to study transversity. FODS-2 will measure spin effects and correlations in the charge pair hadron inclusive production to study transversity. New SPASCHARM experiment will measure asymmetry in miscellaneous exclusive and inclusive channels including charm and DY production. New SPASCHARM experiment will measure asymmetry in miscellaneous exclusive and inclusive channels including charm and DY production. We are working to accelerate polarized protons (together with BINP, Novosibirsk). We are working to accelerate polarized protons (together with BINP, Novosibirsk). Intermediate (40-70 GeV) beam energy is a perfect tool to study polarization effects in miscellaneous reactions Intermediate (40-70 GeV) beam energy is a perfect tool to study polarization effects in miscellaneous reactions

SPIN October 2008N. Tyurin, Director's session10 Backup slides

SPIN October 2008N. Tyurin, Director's session11 Polarization (asymmetry) in the charge exchange reactions (PROZA: ) π - p ↑ →π 0 n, V.D. Apokin et al., Yad.Fiz.45:1355,1987 π-p ↑ →  n, V.D. Apokin et al., Z.Phys.C35:173, 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: ,1988]

SPIN October 2008N. Tyurin, Director's session12 Asymmetry in inclusive π 0 production (PROZA-2: ) pp ↑ → π 0 X, Phys.At.Nucl, 67 (2004) 1487Phys.At.Nucl, 67 (2004) 1487 π - p ↑ →π 0 X, Phys.Lett.B243,461 (1990)Phys.Lett.B243,461 (1990) π - p ↑ →π 0 X, Phys.At.Nucl, 67 (2004) 1495Phys.At.Nucl, 67 (2004) 1495 Preliminary, 2008 result pp ↑ →π 0 X, Presented SPIN2008 first time

SPIN October 2008N. Tyurin, Director's session13 Asymmetry in charge hadron production (FODS: )

SPIN October 2008N. Tyurin, Director's session14 FODS-2 asymmetry measurements in inclusive charge hadron production Experimental setup to measure charge hadrons at different angles Experimental setup to measure charge hadrons at different angles Polarized beam from Λ- decays Polarized beam from Λ- decays Asymmetry measurements for π , K ,p  : Asymmetry measurements for π , K ,p  : |x F |  0.2, 0.5  р T  4 GeV/c,   CM  86 o |x F |  0.2, 0.5  р T  4 GeV/c,   CM  86 o -0.1  x F  0.7; -0.1  x F  0.7; 0.3  р T  2.0 GeV/c,  1CM  48 o ;  2CM  105 o

SPIN October 2008N. Tyurin, Director's session15 FODS-2 main results