ЛМНС в 2006 году. Основные научные результаты.

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Presentation transcript:

ЛМНС в 2006 году. Основные научные результаты. ЛМНС в 2006 году. Основные научные результаты. Отчет заведующего лабораторией

Содержание ☻Основные результаты 2006 ☻Финансы ☻Планы

He4 published ЯФ 2006 О Миклухо -new readout-when?? Modification NN-amplitude in nuclear medium О Миклухо He4 published ЯФ 2006 Модернизация Спектрометра -проп камеры для улучшeния углового разрешения -new readout-when?? 2006 Spectrometer upgrade allows for a high resolution P→2P experiment on Ca40 target aimed at clarifying whether the nucler density or Es is the correct parameter for NN –amplitude modification

Hermes spectrometer E_e=27.5 GeV , polarized P_b≈50% (longitudinal) RD Polarized H2,D2 gas target,P_t~90%, longitudinal and transverse, unpolarized A target RD

Команда ПИЯФ в обслуживании эксперимента Команда ПИЯФ в обслуживании эксперимента experts on call: В Вихров RD installation, SiFi Г Гаврилов gas system, TRD А Изотов Slow Control, DAQ А Киселёв Data production Ю Нарышкин LW SD Д Веретенников Mag.Ch.

PNPI analysis topics at HERMES С. Манаенков Vector meson production SMDE Ю. Нарышкин Hyperon production at HERMES А. Жгун Phi_gamma, P_T П. Кравченко DSA, Δq final analysis Ю. Санжиев DSA of Ks s-quark polarization Д.Веретенников KLL DLL in photoproduction

Quark P_T distributions and hadronization (released ). Антон Жгун Contributions to PT: quark motion in nucleon fragmentation rescattering in nuclear medium Conclusion: Swelled nucleons?

How does Λ-hyperon spin structure look like? Hyperon physics How does Λ-hyperon spin structure look like? In CQM P(u,d)=0 P(s)=1 In Spin Crisis P(u,d) from 0 to -0.2 P(s)~0.6 R.L.Jaffe: to measure spin transfer u to Λ

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

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

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

P_T dependence Юрий Нарышкин, С.Б. + Aaron ,N.Makins Final→PRD

Diquark polarization in nucleon(!) Денис Веретенников KLL (from target) preliminary DLL (from beam) very preliminary

Quark polarization in nucleon (spin crisis) Полина Кравченко MC tune New data: K+,K-, P,Pbar

Publications&Talks A.Airapetian et al.,HERMES collaboration “Longitudinal spin transfer to the lambda Hyperon in Semi-inclusive Deep-inelastic Scattering” Phys.Rev.D 74 (2006) 072004 A.Airapetian et al.,HERMES collaboration “Double-hadron leptoproduction in nuclear medium” Phys.Rev.Lett.96 (2006)162301 A.Airapetian et al.,HERMES collaboration ”Precision determination of structure function g1 of proton, deuteron and neutron” Phys.Rev D (2006) (in press) O.V.Miklukho “Polarization in quasi-elastic (p.2p) scattering from 4 He at 1 GeV” Physics of Atomic Nucleus 69,n3,2006 474

Publications&Talks S.Belostotski “Topical aspects of hyperon physics” in ‘Hadron Physics’ 97-120 (2006) edition of Uni.Glasgow, Scotland, U K Conference talks for HERMES Collaboration: Ю. Нарышкин “Study of Lambda polarization at HERMES” 7-th International Conference on Hyperons, Charm and Beauty Hadrons; Beach 2006 Lancaster Uni, Lancaster U K С. Манаенков “Study of Spin Density Matrix Elements in exclusive ρ0 production at HERMES” 13 International QCD Conference” Montpellier, France, July 2006

Финансы Влияние ядерной среды 800 т. р. Контракт (япон.) 12.5 KUSD Влияние ядерной среды 800 т. р. Контракт (япон.) 12.5 KUSD Визиты росс фонд 55 KUSD Визиты DESY 105 KEU

Where to go? Continue 2-arm spectrometer experiments; HERMES after HERA shutdown. Finalize analysis topics; PANDA. TOF prototyping, test station. Participation in STT, magnet design…. WASA experiment at COSY; PAX ?

Состав лаборатории С Белостоцкий зав. проф. д. ф.-м. н. С Белостоцкий зав. проф. д. ф.-м. н. Г Амальский н. с. В Вихров с. н. с. к. ф.-м. н. З Гадицкая ст. лаб. А Жгун с. н. с. к. ф.-м. н. А Жданов с. н. с. к. ф.-м. н. А Изотов с. н. с. к. ф.-м. н. А Киселев н. с. П Кравченко н. с 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. А Прокофьев с. н. с. к. ф.-м. н. Л Обрант инж. Прогр. 2 кат. Ю Санжиев н. с м. н. с. В Федулов слес. 6р. Д Веретенников стаж. В Плотников ст. лаб.-иссл.

С Новым Годом !!!

The HERMES Recoil Detector

Longitudinal Spin Transfer to the Λ Hyperon DLL Phys.Rev.D

Transverse Λ polarization in photoproduction, pz/pbeam<0.25, remnant fragmentation Юрий Н

Transverse Λ polarization in photoproduction, pz/pbeam>0.25, Υ→SS _ Юрий Н

Transverse motion of quarks in nuclei Антон Ж

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

Finally, for hadron-hyperon (not VM difractive /exlusive) photon beam Photon structure q Finally, for hadron-hyperon (not VM difractive /exlusive) production vertex q dominates

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