Spin Physics with light and heavy neutral mesons

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Spin Physics with light and heavy neutral mesons at Protvino V. Mochalov (IHEP, Protvino)

Spin Physics with light and heavy neutral mesons at Protvino V. Mochalov (IHEP, Protvino) On behalf of the SPASCHARM collaboration 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006

Outline l Current Spin Program at IHEP l PROZA-2 M l experiment Proposal of

Outline l Current Spin Program at IHEP l PROZA-2 M l experiment Proposal of new Spin program at IHEP l Acceleration of polarized proton beam at U-70 l Physics program with polarized proton beam at Protvino (Proposal SPASCHARM) 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 2

PROZA-2 M participants A. M. Davidenko, A. A. Derevschikov, Yu. M. Goncharenko, V. Yu.

PROZA-2 M participants A. M. Davidenko, A. A. Derevschikov, Yu. M. Goncharenko, V. Yu. Khodyrev, V. I. Kravtsov, Yu. A. Matulenko, Yu. M. Melnick, A. P. Meschanin, N. G. Minaev, V. V. Mochalov, D. A. Morozov, L. V. Nogach, S. B. Nurushev, P. A. Semenov, L. F. Soloviev, A. N. Vasiliev, A. E. Yakutin Institute for High Energy Physics, Protvino, Russia N. L. Bazhanov, N. S. Borisov, A. N. Fedorov, A. B. Lazarev, A. B. Neganov, Yu. A. Plis, O. N. Shchevelev, Yu. A. Usov JINR, Dubna, Russia 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 3

PROZA experimental history l Single Spin Asymmetry measurements in miscellaneous reactions: l l l

PROZA experimental history l Single Spin Asymmetry measurements in miscellaneous reactions: l l l 1980 -1985: charge-exchange reactions 1986 -1996: inclusive π0 and η production in central and non-polarized beam fragmentation region 1999 -2006: inclusive π0 production in polarized target fragmentation region 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 4

PROZA-2 M experimental setup l l l EMC from 720 lead glass blocks π-

PROZA-2 M experimental setup l l l EMC from 720 lead glass blocks π- (3∙ 106 /cycle) or proton (up to 7∙ 106 /cycle) beam propane-diol (C 3 H 8 O 2) target – 90% polarization 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 5

PROZA-2 M recent results pp↑→ π0 X, Phys. At. Nucl, 67 (2004) 1487 pp↑→π0

PROZA-2 M recent results pp↑→ π0 X, Phys. At. Nucl, 67 (2004) 1487 pp↑→π0 X, Phys. At. Nucl, 68 (2005)1790 π-p↑→π0 X, Phys. Lett. B 243, 461 (1990) 19 -26, July, 2006 pp↑→π0 X, Phys. At. Nucl, 67 (2004) 1495 V. Mochalov Spin Program at IHEP, Praha-2006 6

PROZA-2 M universal threshold l l l 19 -26, July, 2006 Universal threshold in

PROZA-2 M universal threshold l l l 19 -26, July, 2006 Universal threshold in single -spin asymmetry was observed for fixed target experiments (Phys. At. Nucl, 67 (2004) 2169) More data (also in differenet cinematic regions) are required to check the threshold. Experiments with polarized beam are necessary to check the threshold. V. Mochalov Spin Program at IHEP, Praha-2006 7

PROZA-2 M plans x. F Measured AN in the Expected accuracy in the reaction

PROZA-2 M plans x. F Measured AN in the Expected accuracy in the reaction -+p 0+X reaction pp 0+X (20 day of (60 day of running) running in 2005) – (0. 1 -0. 2) (0. 4± 1. 4) % 1. 4 % – (0. 2 -0. 3) (-3. 3± 2. 4) % 1. 2 % – (0. 3 -0. 4) (-1. 0± 3. 9) % 1. 7 % – (0. 4 -0. 5) (-12. 7± 4. 8) % 3. 3 % – (0. 5 -0. 6) (-14. 4± 7. 2) % 6. 0 % – (0. 6 -0. 8) (-18. 3± 11. 2) % 7. 0 % One more data taking run is planning for 2006 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 8

PROZA-2 M Summary Essential spin effects have been found in inclusive π0 -production. l

PROZA-2 M Summary Essential spin effects have been found in inclusive π0 -production. l Universal threshold in inclusive pion production have been found for fixed target experiments l Polarized beam is required to achieve better accuracy l New physics is achievable with polarized proton beam l 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 9

Polarized beam at IHEP-status l l l l First proposal was prepared at 80’s,

Polarized beam at IHEP-status l l l l First proposal was prepared at 80’s, but was rejected due to technology problem. Success in technology of siberian snakes (helical magnets) gives us new possibilities. Workshop on Polarized beam at U-70 was organized at 2005. Second workshop was held June, 5 -6, 2006 Letter of intent is prepared Physical program is prepared Collaboration of three Labs is created 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 10

Acceleration of polarized proton beam at U-70 l l Polarized source Acceleration in 1.

Acceleration of polarized proton beam at U-70 l l Polarized source Acceleration in 1. 5 Ge. V booster Partial siberian snakes in U 70 main ring Extraction of the beam to experiments Collaboration of IHEP(Protvino), INR (Moscow) and BINP (Novosibirsk) 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 11

Different Polarized ion sources 19 -26, July, 2006 V. Mochalov Spin Program at IHEP,

Different Polarized ion sources 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 12

Polarized source from INR · H- current: 3. 8 m. A l Polarization: 90%

Polarized source from INR · H- current: 3. 8 m. A l Polarization: 90% l Normalized emittance: 1. 7 mm mrad l Pulse duration: 170 μsec l Frequency: 5 Hz (17 Hz required) 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 13

Polarized source - summary INR source with resonant charge-exchange plasma ionizer may be used

Polarized source - summary INR source with resonant charge-exchange plasma ionizer may be used at U-70. Intensity is equal to the intensity of current unpolarized beam l Frequency can be increased up to 17 Hz after few changes in dissociator and vacuum system l Source can be developed in 2009. l INR team: A. S. Belov, V. I. Derbilov, A. I. Drugakov, V. N. Zubets, Yu. Zh. Kalinin, Yu. V. Kiselev, V. S. Klenov, l. V. Kravchuk, V. A. Matveev, A. A. Menshov, V. I. Moiseev, L. P. Nechaeva, E. S. Nikulin, V. P. Potapov, A. V. Feschenko, V. P. Yakushev l 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 14

Dangerous depolarization resonances at booster. l l l 70% of polarization is conserved without

Dangerous depolarization resonances at booster. l l l 70% of polarization is conserved without any improvement There is no space for quads for fast jump Depolarization by imperfection resonances may be decreased using orbit bump correction Depolarization by intrinsic resonance may be decreased by increasing emittance 1 Ge. V injection energy to U-70 helps to preserve polarization (85%) 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 15

Siberian snakes l l l Principles of siberian snakes (Ya. Derbenev, ( A. Kondratenko,

Siberian snakes l l l Principles of siberian snakes (Ya. Derbenev, ( A. Kondratenko, 1974) Siberian snakes at RHIC (V. Ptitsyn, Yu. Shatunov, 1994) BINP team is responsible for acceleration at IHEP: Yu. M. Shatunov, N. V. Gorbovskaya, S. A. Zevakov, E. A. Kuper, G. Ya. Kurkin, B. A. Lazarenko, D. M. Nikolenko, A. V. Otboev, V. A. Polukhin, I. A. Rachek, R. Sh. Sadykov, D. K. Toporkov, P. Yu. Shatunov, Yu. V. Shestakov 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 16

Spin resonances at U-70 νx = 9. 8 νz = 9. 87 νy =

Spin resonances at U-70 νx = 9. 8 νz = 9. 87 νy = 0. 002 (ΔЕ = 523. 342 Me. V) (P = 12) imperfection ν=k Zs ≈ 1 мм intrinsic ν = k ± νz (εz ) norm = 10 mm· mrad S = -(99% S 0 ) δS = 99% S 0 10 19 -26, July, 2006 20 30 40 50 V. Mochalov Spin Program at IHEP, Praha-2006 60 70 γ 17

Place for 3 partial snakes The only possibility is to change acceleration stations by

Place for 3 partial snakes The only possibility is to change acceleration stations by 3 partial siberian snakes 114 84 54 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 18

Partial snakes for U-70 By 19 -26, July, 2006 Bx V. Mochalov Spin Program

Partial snakes for U-70 By 19 -26, July, 2006 Bx V. Mochalov Spin Program at IHEP, Praha-2006 Bz 19

Bx(z) and By(z) on the snake axis corrector Helix 3. 4 m 19 -26,

Bx(z) and By(z) on the snake axis corrector Helix 3. 4 m 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 20

Proton’s trajectory in the snake corrector E=25 Гэ. В Helix 3. 4 m x

Proton’s trajectory in the snake corrector E=25 Гэ. В Helix 3. 4 m x 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 21

Spin rotation at snake 19 -26, July, 2006 V. Mochalov Spin Program at IHEP,

Spin rotation at snake 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 22

Spin tracking: 30 particles (εz=10 π mm mrad; νz=9. 70) 19 -26, July, 2006

Spin tracking: 30 particles (εz=10 π mm mrad; νz=9. 70) 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 23

Spin tracking: 30 particles (εz=10 π mm mrad; νz=9. 94) 19 -26, July, 2006

Spin tracking: 30 particles (εz=10 π mm mrad; νz=9. 94) 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 24

Parameters of p beam near the targets of the experiments Extracted beam Experimental setup

Parameters of p beam near the targets of the experiments Extracted beam Experimental setup Size in horiz. plane, Size in vert. plane, Beam polarization, mm mm SVD FODS SPIN PROZA 1. 09 0. 58 1. 57 0. 22 0. 84 0. 94 1. 42 1. 56 0. 96 1 0. 99 1 Beam depolarization is very low due to: Ø Relatively small p beam emittance (if to compare with secondary beams) Ø Opposite direction of magnetic field components in focusing and defocusing lenses Ø Stochastic method of beam extraction (developed at IHEP) is required for polarization conservation 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 25

Acceleration of polarized proton beam Summary l There is no principal difficulties in acceleration

Acceleration of polarized proton beam Summary l There is no principal difficulties in acceleration of polarized beam l INR source provides required polarization, intensity and emittance. Acceleration of polarized protons at U-70 is possible using three partial helical siberian snakes (|ws| ≈ 0. 18). Spin tracking study approved analytical study and the possibility to accelerate polarized beam at U-70 Final polarization can be >65% (Source- 90%, booster 85%, main ring 85%) What to do: l l l l l design strategy for booster develop helical magnets (λ = 0. 75 м ; L=3. 4 m; B = 4. 5 Т); align U-70 magnets Dz ≤ ± 0. 5 мм ; keep emittance at the level εz = 10 -15 mm mrad; Betatron tunes: νz = 9. 95; νx =9. 8 (at least at 40 Ge. V). Spin rotator (4 helical magnets, λ = 2. 5 м ; B = 4. Т) is required for beam extraction 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 26

SPin ASymmetries in CHARM Production IHEP (Protvino) group: S. I. Alekhin, I. A. Alikhashkin,

SPin ASymmetries in CHARM Production IHEP (Protvino) group: S. I. Alekhin, I. A. Alikhashkin, N. I. Belikov, B. V. Chujko, A. M. Davidenko, A. A. Derevschikov, Yu. M. Goncharenko, V. N. Grishin, V. A. Kachanov, Yu. V. Kharlov, V. Yu. Khodyrev, D. A. Konstantinov, V. A. Kormilitsyn, A. S. Kozhin, V. I. Kravtsov, A. K. Likhoded, Yu. A. Matulenko, V. A. Medvedev, Yu. M. Melnick, A. P. Meschanin, N. G. Minaev, N. E. Mikhalin, V. V. Mochalov, D. A. Morozov, L. V. Nogach, S. B. Nurushev, A. V. Ryazantsev, Yu. I. Salomatin, P. A. Semenov, S. R. Slabospitsky, L. F. Soloviev, A. F. Prudkoglyad, M. N. Ukhanov, A. V. Uzunyan, A. N. Vasiliev, A. S. Vovenko, A. E. Yakutin JINR (Dubna): I. A. Savin and Yu. A. Usov groups 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 27

Spin Crisis and parton distribution functions l Only 1/3 of the longitudinally polarized proton

Spin Crisis and parton distribution functions l Only 1/3 of the longitudinally polarized proton spin is described by quark’s spin. 70% of proton spin may be explained by gluon and/or orbital moment contributions. l Experiments at CERN, HERA, SLAC (polarized lepton beams) measured mainly quark polarization for last 15 years. l COMPASS and HERMES are trying to measure gluon polarization at small х= 0, 1 -0, 15. RHIC experiments (ALL in direct gamma production) begin to measure gluon polarization at very low values of х (~0. 01). l Gluon polarization should be measured in a whole range of х (0 -1). New experiments required to measure gluon polarization at different х. l 3 fundamental parton distribution functions are introduced in QCD: l l l Spin-averaged parton distribution function f(x) - measured Helicity function in longitudinally polarized nucleon g(x) – quark contribution was measured, undirect measurements of gluon contribution using QCD analysis and different models. Transversity function h(x) in transverse polarized nucleons (not measured at all) 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 28

SPASCHARM (Main experimental task) l Main goal of the experiment is to measure double-spin

SPASCHARM (Main experimental task) l Main goal of the experiment is to measure double-spin asymmetry ALL using longitudinally polarized proton beam and target in the reactions p + p 2 + X and p +p J/ +X ↳ J/ + ↳ e + e - (μ + μ - ) ↳ e+ e- (μ+ μ-) J/ (3096): JPC = 1 -- ; 1 (3510) : JPC = 1++; 2 (3555) JPC = 2++ l Double-spin asymmetry ALL is defined as: ALL = [ 1/(PB * PTeff)] * [ I(++) – I(+ –)] / [ I(++) + I(+ –)], where PB – beam polarization, PTeff – effective target polarization, I(++) , I(+–) – normalized number of charmonium events, the helicity states (++) and (+–) correspond to polarization combinations ( ) and ( ), where arrows indicate the beam and target spin direction in laboratory frame. 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 29

Charmonium production in hadron reactions 3 main diagrams contribute to the -states production in

Charmonium production in hadron reactions 3 main diagrams contribute to the -states production in hadron interactions: l Gluon fusion (a); l Quark-anti quark annihilation (b); l Color evaporation (c). l (a) (b) (c) 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 30

∆G/G study l l Quark and gluon polarization may be studied in АLL measurement

∆G/G study l l Quark and gluon polarization may be studied in АLL measurement in inclusive 2, 1 and J/ production. G/G(x) is clearly measured for 2 (JPC = 2++). Gluon-gluon fusion is supposed to be dominant in 2 production. G/G can be measured directly: ALL (x. F) = LL * [∆G/G (x 1)* ∆G/G (x 2)], where l l x 1 , x 2 –part of proton momentum, carried out by gluons, x. F – Feynman variable of 2 -state, (M 2)2 = x 1 * x 2 * S, ∆G / G (x) = (G+(x) – G-(x))/(G+(x)+G_(x) ), LL–ALL( 2) for two fully polarized gluons ( LL =-1 in the model of gluon-gluon fusion) 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 31

 1 and J/ production l l l 1 should not be produced through

1 and J/ production l l l 1 should not be produced through gluon-gluon fusion. 1 (JPC = 1 --) can not be produced by two gluons (Landau theorem). If rates of 1 and 2 are of the same order in pp-interactions, the contribution of other diagrams must be added for G/G calculation. J/ measurements is also additive to 2. Main sources of J/ production are radiative decay of 2 (and possibly 1) and processes with color evaporation gg g+J/. Theoretical models and contribution of different diagrams to the production mechanism can be checked measuring relative cross-section as well as values of АLL in 2, J/ and 1. production using pion and proton beams. 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 32

Other physics goals l l l Cross-section ratio of 1/ 2 production using pion

Other physics goals l l l Cross-section ratio of 1/ 2 production using pion and proton beam will help to determine Charmonium production mechanism (required for gluon polarization study). Production of hadrons with heavy quarks gives us information about their structure and interaction mechanism. АNN measurements in Drell-Yan pair production are required to measure transversity h(x) – quark distribution function in transversely polarized proton. АN and АNN in J/ , 1 and 2. production will be also measured. “Asymmetry spectroscopy”: Single and double-spin effects for different particles. 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 33

Charmonium cross-section in hadron interactions Extremely small cross-section. J/ cross-section in p - interactions

Charmonium cross-section in hadron interactions Extremely small cross-section. J/ cross-section in p - interactions is 10 -32 sm 2 at 40 Ge. V; + - (or е+е-) branching is 6%. l Strong dependence on Energy and particle flavor. Existing of valence anti-quarks is reponsible for quarkantiquark annihilation in p-interactions. J/ production cross-section (x. F >0) is 15 nb for p and 2 nb for ppinteractions at 40 Ge. V. l Gluon-gluon fusion contributes to J/ production. J/ cross-section in pp-interactions at 70 Ge. V is approximately 7 -8 times larger than at 40 Ge. V due to increase of this channel. l Estimates: at 70 Ge. V gluon fusion and quark-antiquark annihilation are equal. l 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 34

Experimental measurements of charmonium in hadron interactions l l 1 and 2 were studied

Experimental measurements of charmonium in hadron interactions l l 1 and 2 were studied at Goliaph (CERN) in -Beinteractions at 185 Ge. V in muon mode (left). Gamma’s were detected by magnet spectrometer using е+еconversion. 44750 J/ -and 150 1/ 2 states were found. (11660 139) J/ were found at E 771 experiment (FNAL) at p. Si interactions at 800 Ge. V (right). 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 35

Experimental study of ( 1)/ ( 2) ratio • Gamma-quanta was reconstructed for J/

Experimental study of ( 1)/ ( 2) ratio • Gamma-quanta was reconstructed for J/ events (E 771 -left) in the decay J/ + using е+е- conversuion (left). (33 9) 1 and (33 10) 2 were found. • E 771 experimend found that ( 1)/ ( 2) ratio is 0, 59 0, 20(stat. ) 0, 05(syst. ). The result is presented in right figure together with two other FNAL data and averaged world value. • Averaged world value of ( 1)/ ( 2) ratio for proton-nuclei interactions is 0, 31 0, 14. Relative error is 45%. 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 36

Theoretical expectations of АLL in charmonium production. l Theoretical predictions of ALL mainly depend

Theoretical expectations of АLL in charmonium production. l Theoretical predictions of ALL mainly depend on two assumptions : l gluon polarization ∆G/G and l charmonium production mechanism which defines LL at the parton level (in parton-parton interaction) l In the proposed experiment х ~0. 3, where ∆G/G predicted in different theoretical models is in the range between 0. 15 and 1. l Different models give different predictions for ALL : l [Doncheski, Robinet] – gluon fusion: ALL = -24% for 2 and -18% for J/ l [Contogoris] – color evaporation: ALL= +(18 -42)% for both 2 and J/ 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 37

Monte-Carlo simulation l MC simulation study was carried out to establish requirements for experimental

Monte-Carlo simulation l MC simulation study was carried out to establish requirements for experimental setup (mainly to separate states): l l l PYTHIA was used as a standard generator. Only gluon-gluon fusion and color evaporation for this process was used for reconstruction study (quark-antiquark annihilation is absent). - states ( 0(3410), 1(3510) and 2(3555)) decay to J/ + was studied. J/ decay was studied only in muon mode. Including quark-antiquark annihilation does not change distributions. l MC was carried out for different momentum resolution of the tracking system and two values of energy resolution of electromagnetic calorimeter (EMC). The accuracy of the primary vertex reconstruction is (z) = 10. Momentum resolution values is presented for 10 Ge. V particle. l The influence of cinematic 1 С-fit for J/ (J/ mass is fixed, 3 momentum components are fitted) to 1/ 2 states mass resolution and improvement of separation was studied. 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 38

MC energy distributions Distribution of +/ - energy from J/ -decay. Average muon energy

MC energy distributions Distribution of +/ - energy from J/ -decay. Average muon energy is 11. 5 Ge. V. 19 -26, July, 2006 -quanta energy distribution from 0 (3410), 1 (3510) and 2 (3555) decays. Average energy 3. 5 Ge. V. Mochalov Spin Program at IHEP, Praha-2006 39

Separation of - states Without 1 C fit. p/p=0. 3%. (E)/E= 12%/√E. With 1

Separation of - states Without 1 C fit. p/p=0. 3%. (E)/E= 12%/√E. With 1 C fit p/p=0. 4%. (E)/E= 2. 5%/√E. 19 -26, July, 2006 Without 1 C fit. p/p=0. 4%. (E)/E=2. 5%/√E. J/ momentum from PHYHIA. p/p=0, 4%. (E)/E= 2. 5%/√E. V. Mochalov Spin Program at IHEP, Praha-2006 40

Influence of 1 C fit for J/ and detector resolution on - states separation

Influence of 1 C fit for J/ and detector resolution on - states separation p /p for + (E)/E for and -quanta 1 С-fit for J/ (М) of J/ , (М) of , Me. V/c 2 Separation of -states 0, 025 table 0, 0 6, 0 Yes 0, 004 0, 025 yes 0, 0 9. 1 Yes 0, 004 0, 025 no 12, 0 13, 2 bad 0, 003 0, 12 no 9, 3 29 no 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 41

J/ registration in hadron modes J/ can be studied also in hadron modes(see table).

J/ registration in hadron modes J/ can be studied also in hadron modes(see table). Geometrical efficiency (with branching) for muon mode is 3. 6%, for three hadron modes 2. 5%. EMC energy resolution (Е)/E = 8%/√E (at least one gamma is out of central EMC region). Statistics may be increased for J/ as well as for 1/ 2 states. Decay mode М (J / ) p / p efficiency, %( геом. ) Branching, %(Br) геом. x Br, % + + - 24 0, 01 60 6 3, 6 13, 4 0, 005 60 6 3, 6 + - 0 2( + -) 0 29 0, 005 50 1, 5 0, 75 29 0, 005 30 3, 37 1 3( + -) 0 25 0, 005 10 -30 2, 9 0, 3– 0, 9 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 42

Experimental setup requirements l l l Possibility to work with 5∙ 106 interaction/cycle (3

Experimental setup requirements l l l Possibility to work with 5∙ 106 interaction/cycle (3 sec table, duty factor is 1/3, beam intensity 5∙ 107 p/cycle) Large acceptance for Charmonium and Drell-Yan processes registration; EMC energy resolution (E)/E=2. 5%/√E, required for 1/ 2 separation (mass difference is 45 Me. V/c 2 at the level of ~3. 5 Ge. V/c 2; Resolution of the tracking system p/p=0. 4% at 10 Ge. V. Good separation of electrons and muons from hadrons, (of charm production is at the level of 10 -7 – 10 -8 per interaction in the target). Very fast DAQ to write information with the rate up to 100 Mb/sec (to study different inclusive processes with large cross-section). 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 43

Experimental setup l l l l Experimental Setup will consist of: Beam detectors (fast

Experimental setup l l l l Experimental Setup will consist of: Beam detectors (fast scintillation counters and fiber hodoscopes); Transversely and longitudinally polarized targets; Magnet spectrometer: (GEM; MWPC or m. DC); Electromagnetic calorimeter (ECal), PWO in central part, lead glass and sandwich in outer part; Pad trigger scintillation hodoscope before ECal; Hadon calorimeter; Muon detector; Fast electronics and DAQ. 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 44

Acceptance of experimental Setup for 2 Geometrical Acceptanc for 2 at x. F>0, -quanta

Acceptance of experimental Setup for 2 Geometrical Acceptanc for 2 at x. F>0, -quanta is detected in central part of ECal 10< <125 mrad, + and - (е+ and е-) from J/ decay are detected in the angle range 10< <250 мрад 19 -26, July, 2006 Cinematic region of 2 state. V. Mochalov Spin Program at IHEP, Praha-2006 45

Experiment Stages l Stage 1 (with “old” polarized target and without polarized beam): l

Experiment Stages l Stage 1 (with “old” polarized target and without polarized beam): l l Single-spin asymmetry АN in J/ and 1/ 2 inclusive production using pion and unpolarized proton beam. Expected statistics (conservative) for 40 days of data taking is: l - (40 Ge. V) beam (5 106 -/cycle): 4 000 J/ and 500 1/ 2. l p (70 Ge. V) beam (5 107 р/cycle): 40000 J/ and 5000 1/ 2 states. 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. Stage 2 (with longitudinally polarized beam and target): l l Double-spin asymmetry АLL measurements to study G/G(x). АNN measurements for Drell-Yan pairs to study transverslity h(x). Simultaneously АNN and AN in J/ , 1/ 2. production will be studied. 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 46

Possible stage 0 l l l SPASCHARM experimental setup is universal and will be

Possible stage 0 l l l SPASCHARM experimental setup is universal and will be used to study charmonium production using heavy ion beam. SPASCHARM construction time – 6 years (beginning 2007), but: We are discussing the possibility to start spin studies at 2009 before all experimental detectors will be ready. The possible physics is polarization study of usual (ρ, ω etc. ) and strange (φ and others. ) resonances in inclusive and/or exclusive reactions. l l l Particle identification is required. Existing calorimeters, magnet and cherenkov counters may be used after small modernization. New tracking system (MWPC or m. DC chambers, GEM detectors or similar with resolution 70 μm) and new fast electronis and DAQ required. Existing muon detector may be used after modernization (to decrease read-out time). We invite all to discuss physics program for stage 0. 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 47

Other physics with polarized beam using existing experimental setups l FODS: Systematic investigation of

Other physics with polarized beam using existing experimental setups l FODS: Systematic investigation of reactions: Where h is charged hadron ( ±, К±, р or р ). Measuremens on dependence of х. Т, х. F, A, hh, l l SPIN –elastic pp-scattering SVD – investigation of polarization in Λ production. 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 48

Schedule (most optimistic) l l l TDR - 2007 Polarized ion source - 2009

Schedule (most optimistic) l l l TDR - 2007 Polarized ion source - 2009 Accelerator upgrade - 2009 Siberian snakes development - 2009 Installation of siberian snakes and first polarized beam -2010 SPASCHARM stages l l l Zero - 2009 First - 2011 Second - 2013 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 49

Invitation for collaboration l International collaboration is very important for final approval (scientific importance

Invitation for collaboration l International collaboration is very important for final approval (scientific importance of the experiment) and success of the project: l l l Physic goals and proposal of new experiments; Theoretical predictions; Participation in experiments, manpower and/or equipment, mainly: Polarized targets l Tracking system l Particle identification (stage 0) l Electronics and DAQ l 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 50

Summary l l IHEP has rich history of spin study. We are proposing and

Summary l l IHEP has rich history of spin study. We are proposing and developing interesting physics program with polarized beam The project inside State Program for High Energy Physics is preliminary approved by Russian Ministry of Science and Education Finally, we have very good chance to accelerate polarized beam at U-70 during next 4 -5 years. 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 51

Backup slides 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 52

Backup slides 19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 52

19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 53

19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 53

19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 55

19 -26, July, 2006 V. Mochalov Spin Program at IHEP, Praha-2006 55