ЛМНС в 2007 году. Основные научные результаты. Отчет заведующего лабораторией

Nucleon spin structure. Status of experiments SLAC GeV Spin physics at RHIC GeV COMPASS (EMC,SMC) 160 ( ) GeV HERMES 27.3 GeV ΔΣ inclusive, BSR,JSR ΔG, transverse spin ΔΣ, ΔG,transverse spin ΔΣ, ΔG, quark helicity distributions, L q, transverse spin u,d,sSU(3) f

summary: HERMES view at the nucleon spin structure helicity distributions ??? transversity DF and Collins FF Sivers DF transverse Λ-polarization VM production

summary: HERMES view at the nucleon spin structure helicity distributions ??? transversity DF and Collins FF Sivers DF transverse Λ-polarization VM production

saturates Contribution from small X

strange sea content ΔS valence quark content Δu, Δd total contribution ΔΣ Polarization of quarks in nucleon quarks

quark helicity distributions. theory: QCD fit to inclusive DIS, SU(3), BJSR required. Agreement looks fine evaluated Δs compatible with zero NLO +all corrections in progress Polina K

Vector Meson (VM) production at HERMES Exclusive VM production provides access to GPDs: HERMES obtained first POLARIZED data for Φ-meson production gluon exchange Experimental information (polarized beam&target) sufficient to go from SDME analysis to direct reconstruction of spin-dependent amplitudes in progress Sergey M new

Lambda polarization observables First solid observation in lepto/photoproduction !! Phys Rev. D 2007 Yuri N+Denis V Polarization of Ξ hyperons Spin transfers KNN, KLL, DLL A-dependence of P Λ is under study In progress approved by collaboration

Modification NN-amplitude in nuclear medium Оleg М New polarization parameter Cnn in p2p on 4 He This year: tests of new readout new hydrogen/ helium target reference measurements on H Next year: Collect statistics on 4He

Existing and Future Facility of GSI Existing facility: UNILAC < 20 MeV/u SIS < 1-2 GeV/u ESR < 0.8 GeV/u HESR 2013

Top view of PANDA detector TOF wall TOF in the dipole magnet TOF wall Final request 989 KEU PID for hadrons with momenta < 4 gev/c ps

Mile stones for TOF wall Design, MC simulations and test of the prototype module Procurement of scintillation materials and PMs for mass production Design and fabrication of mechanical structure Mass-production of all TOF modules Assembly and tests of the TOF equipment in place Alignment of the TOF wall Incorporation of TOF in PANDA DAQ system

В этом году МС light propogation Mинимальный вариант тест станции c использованием Hamamatsu R2083, R4998, BC mm*100mm*15mm, BC mm* 50mm*15mm, BC mm*100mm*15mm Тест с имеющейся электроникой Прототип CFD 2008 Комплектация тест станции и разработка прототипа

Publications&Talks С.Белостоцкий Recent results from HERMES overview talk 12th Workshop on High Energy Spin Physics (DSPIN-07) 12th Workshop on High Energy Spin Physics (DSPIN-07) Sep 3 - 7, Dubna, Russia Д.Веретенников Lambda and Lambdabar polarization and spin transfer in photoproduction at HERMES 12th Workshop on High Energy Spin Physics (DSPIN-07) 12th Workshop on High Energy Spin Physics (DSPIN-07) Sep 3 - 7, Dubna, Russia С. Манаенков Exclusive diffractive electroproduction of rho and phi mesons at HERMES 7th European Research Conference on Electromagnetic interactions with nucleons and nuclei September, Milos Greece Ю.Нарышкин Measurement of transverse Lambda polarization in quasi-real photoproduction at HERMES 15th International Workshop on Deep Inelastic Scattering and Related Subjects April 16-20, 2007, Munich, Germany П.Кравченко Measurement of the spin structure functions and latest results on quark helicity distributions from Deep-Inelastic Scattering at HERMES 11th International Conference on Meson-Nucleon Physics and the Structure of Nucleon, MENU2007. September 10-14,2007, Juelich,Germany

Финансы 2007 p2p 500 т. руб. ОФН РАН PANDA 500 т. руб. ОФН РАН PANDA help 15 KEU KFI Juelich Визиты DESY 35 KEU МИН. НАУКИ Визиты DESY 90 KEU DESY

Состав лаборатории С. Белостоцкий зав. проф. д. ф.-м. н. Г. Амальский н. с. Д. Веретенников м.н. с В. Вихров с. н. с. к. ф.-м. н. З. Гадицкая ст. лаб. А. Жданов с. н. с. к. ф.-м. н. А. Изотов с. н. с. к. ф.-м. н. А. Киселев н. с П.Кравченко м.н. с С. Манаенков с. н. с. к. ф.-м. н. + О. Миклухо с. н. с. к. ф.-м. н. + Ю.Нарышкин с. н. с. к. ф.-м. н. + Л. Обрант инж. прогр. 2 кат. А.Прокофьев с. н. с. к. ф.-м. н. В. Федулов слес. 6р.

С Новым Годом !!!

PNPI in HERMES analysis П. Кравченко Δq(x) helicity distributions final analysis; Ю. Нарышкин Hyperon production at HERMES, transverse hyperon polarization; Д.Веретенников KLL DLL in Λ-photoproduction С. Манаенков polarized vector ρ, φ meson production ; С.Белостоцкий Sivers function from photoproduction (A UT for pion and kaon ) А. Киселев Data production (alignment, HRC)

HERMES COMPASS ΔΣ festival !!! COMPASSHERMES

CQMJaffe SRHERMES experiment D.De Florian et al Phys.Rev.D 2005 Recent fit Inclusive +semi-inclusive data without SU(3) gives 0.284

Quark helicity distributions from semi-inclusive DIS semi-inclusive case FF q to hadron Phys. Rev. D 2005 new variable

Quark polarizations, first moments and ΔΣ Quark polarization Contribution to proton (hadron) spin from a given quark flavor is given by first moments of Δq(x) Polarized PDF Unpolarized PDF Full quark contribution to proton (hadron) spin

DIS kinematics in Lab frame Phys. Rev. D 2007 ΔΣ from inclusive DIS Only scattered electron (muon) detected Measured in DIS are structure functions LO

Double-spin asymmetry

Transverse Λ polarization First solid obsevation in lepto/photoproduction !! Phys Rev. D 2007 Yuri N+Denis V Polarization of Ξ hyperons Spin transfers KNN, KLL, DLL A-dependence of P Λ is under study In progress

Test stand scheme 1 Gev proton beam

Scintillators and accessories: BC mm*100mm*15mm, edges DTF - one plate USD BC mm* 50mm*15mm, edges DTF - one plate USD BC mm*100mm*15mm, edges DTF - one plate USD BC-600 optical cement, 250 ml - one ~ 100 USD BC-630 Silicon Optical Grease, 60 ml, - one ~ 100 USD total ~2228 USD (~1790Euro) The prices for the Scintillators are from the BICRON offer The prices for the accessories - by estimation PMT with (divider, housing...) Hamamatsu H6533 (1") - 4 PMT 4*1848=7392 Euro Hamamatsu H (2") - 2 PMT 2*2278=4556 Euro PMT total Euro Available in April Available

Cost estimation - Materials: Bicron BC408 scintillator bar 140*10*1.5 cm 3 ~ 670 Bicron BC408 scintillator bar 140*5*1.5 cm 3 ~ 550 Bicron BC408 scintillator bar 100*10*1.5 cm 3 ~ 480 optical cement, etc. ~ PMT: Hamamatsu R2083, diameter -2, 2 pmt ~ 7400 Hamamatsu R4998, diameter -1, 4 pmt ~ Electronics: TDC, Phillips 7186, CAMAC, 1 module ~ 4000 ADC, Phillips 7166, CAMAC, 1 module ~ 4000 NIM to CAMAC, Phillips 433, 5 module ~ 1000 Preamplifier, ORTEG 9306, 2 module ~ 2000 CDF, ORTEG 935,NIM, 1 module ~ 3000 TAC, ORTEG 567, NIM, 2 module ~ 6000 Quard 8k ADC AD 4BA, CAMAC, 1module ~ Oscilloscope: Tektronics TDS5104B, 1GHz ~ Total: ~ 52160

To summarize, TOF needs for identification of forward going charged particles detected by FS with momenta below 4-5 GeV/c. TOF resolution ~50 ps. consist of - scintillation wall (1.4*5.6 m 2, 66 strips, 132 PMT) - side-TOF, inside the dipole magnet -two (1*1 m 2, 5 strips 10 PMT) Cost estimation (not final) - materials (scintillators, light-guides, optical cement..) – PMT (PMT, housings, dividers, µ-metal shielding,…) – electronics (TDC, CFD, VME crates, …..) – HV power supply, cabling – Support structure – Test stand – total – Final request 989 KEU

High Energy Storage Ring Electron cooler E

E_e=27.5 GeV, polarized P_b50% (longitudinal) Polarized H2,D2 gas target,P_t~90%, longitudinal and transverse, unpolarized A target RD Hermes spectrometer

Spin-transfer in DIS, published in PRD 2006 DLL(Λ)=0.11± 0.10± 0.03 Theory:between 0 and -0.2 u (d)-quark polarization in Λ hyperon PNPI/China groups

Summary of HERMES data-taking with polarized targets year type target polar. % He H H D D D HERMES test RUN HERMES RUN I Beam pol. =51% Lumi H,D pol.=259 pb-1 Lumi unpol. = 593 pb-1 (H,D, 3 He, 4 He, 14 N, 20 Ne and 84 Kr) HERA lumi upgrade HERMES RUN II Longitudinal polarization Transverse polarization years type polar.% H unpol. (RD) Beam pol. =36% Lumi H pol.=161 pb-1 Lumi unpol. ~ 530 pb-1

EMC (1988) experiment and spin crisis DIS of polarized muons on polarized target Jaffe sum rule based on SU(3) f.s. and assumption Δs=0 quarks gluons orbital motion to date sum rule Hyperon ß-decay

Transverse Λ polarization, P T dependence Transverse L polarization is larger at low Λ momenta indication of diquark fragmentation mechanism DM model Phys Rev. D 2007 (accepted) First solid observation in lepto/photoproduction !!

The HERMES Recoil Detector

transverse Λ polarization Polarized Λ decay (Λ rest frame) decay plane position Λ production plane position

Влияние ядерной среды на PN амплитуду Олег М+Noro 0.61 Published in ЯФ 2006

typical PITHIA mechanism dominates Hyperon polarization in hadron collision is well-known phenomenon: 30 years ago in Fermilab P+BeΛ()+X studied. Then K+ P Λ()+X, +P Λ()+X, etc. But no data in lepto/photoproduction(!) Transverse Λ polarization -

polarization Λ to Λ yield ¯ 0.25 Юрий Нарышкин, С.Б. + A.Andrus, Makin final