Summary Talk Few Body 18 Ivo Šlaus R. Bošković Institute and TUNL, Duke U niversity I. 50 years ago II. Paradigm change in the NN studies III. Paradigm change in 3B theories IV. Technology we develop changes us V. Few-body research - results, questions VI. Is there an end for few-body research?
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Summary Talk Few Body 18 Ivo Šlaus R. Bošković Institute and TUNL, Duke U niversity I. 50 years ago II. Paradigm change in the NN studies III. Paradigm.
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Summary Talk Few Body 18Ivo Šlaus
R. Bošković Institute and TUNL, Duke U niversity
I. 50 years ago
II. Paradigm change in the NN studies
III. Paradigm change in 3B theories
IV. Technology we develop changes us
V. Few-body research - results, questions
VI. Is there an end for few-body research?
VII. Few-body research community
VIII. ChallengesIX. On being a physicist (Acknowledgement)
COSY, Nuclotron, DAΦNEP*ANDA+FAIR+HESR 1011 p* to study c in hadron mediaDETECTORS: 76Ge, KamLAND, IceCube (South P)....SALAD, SCANDAL, WASA, ANKE, Crystal ball.......COMPUTERS: valves/cards → PC (25), supercomputers,
Δfr = 0.0004±0.011, Δsr = 0.032±0.181, Δfc = 0.001±0.005 compatible with unitarity2) CP violationElect. dipole: n<6x10-26ecm; e
= (0.07±0.07)10-26ecmA non-zero value requires both P and T violation.Neutrino vs antineutrino → lepton sector(neutrino have mass, Σi mi ≤ 1eV from WMAP)
3) CPT invariance - equality of masses and τ of particles and antiparticles: (mK*o – mK
V 3. Experimental data “not compatible” with “current theories”
1) Discrepancies between πNN cc from ≠observables2) 3He(γ,p)d and 3He(γ,pp)n at 10.2 and 16 MeV at
TERASCross sections for the reactions 3He(,p)d and 3He(,pp)n
E(MeV) AV18 AV18+UIX Exptl(,p)d (mb) 10.2 1.01 0.96 0.770.05(,p)d (mb) 16.0 0.71 0.72 0.650.05(,pp)n (mb) 10.2 0.55 0.49 0.150.05(,pp)n (mb) 16.0 1.07 1.04 0.910.06Prel. 12.8 MeV linearly polarized from HIS at forward angles n
energy spectra peak at lower En ≠ CDB+Coulomb.
3) pd capture XS, Axx and Ayy at 140 – 200 MeV RCNP ≠ calc with 3NF
4) σ(θ) 108 – 190 MeV 5) Ay puzzle E≤ 25 MeV & at E = 150 – 190 MeV
6) σ(θ), Ay. Kyy’ and Kxx’ at 250 MeV
7) ann
8) σ(θ) and Ayy at 19 MeV H(d,pp)n in SCRE9) Space star pd: 10.3 - 130 MeV; nd: 10.3 - 25 MeV
10) pp and nn QFS (25 MeV nn this conf)
11) Axx, Ayy, Axz in H(d,pp)n at 135 MeV/nucleon12) Lithium problem: 7Li BBN ≈ 2x observational
values
Einc
(MeV)
Type of measurements Analysis ann (fm)
13 θn1=θn2 = 20.5o, 28o, 35o, 43o
ΔΦ= 0o, TOF1, TOF2, Ep Absolute cross sectionShape of FSI peakanp measured simultaneously with θn3= 55.5o,69o and 83.5o corresponding to 43o- 28o, ΔΦ= 180o
η→ πoγγ Γex=0.45±0.09st ± 0.08sy eV test for χPT: Γ=0.42±0.2eV;
4) Hybrids (qq*g) and Glueballs (gg)Smoking guns JPC = 0--, 1-+, 2+-.... Evidence: in pπ-→π-π+π-p at 18 GeV/c 1-+,5) Hadron in media could ≠ from free ?6) Neutron and proton drip-lines, e.g. X(31F,x) pb;Efimov effect, Thomas effect;
QFR and “2 spectators QFS”;Borromean, samba and tango nuclei7) NNγ:”off-shell NN amplitude is as a matter of principle
an unmeasurable quantity in NNγ” (1964→75→2000)(Brayshaw, Noyes, Polyzou and Glöckle: off shell – 3NF)
European FB since 1975, Asian-Pacific since 1999(typically 200-400 participants from 20 – 40 countries)
FewBody Systems 1986 (W. Plessas)
APS FB 330 vs APS NP 2476
VIII CHALLENGES
1) Nuclear interaction at N3LO (with 3NF) even N4LO implying CD and CSB
2) More EFT χPT studies required
3) Rigorous 3B, 4B, GFMC, NCSM using NnLO with n ≥ 3 and CD + CSB
4) Relativity
5) Short range: dibaryon – Moscow/Tübingen; p-e EFT potentials should give the same result for all observables
6) Can all EFT parameters be uniquel determined?
7) Latitude in fine tuning PS and parameters?
8) π-N scattering data should get πNN cc9) “Several” potentials - temporary10) N – hyperon and H – H interaction 11) Mesons, baryons, resonances hybrids,
glueballs, etc – topics of conferences: NSTAR, MENU, ETAMESON, e.g. np→dη relativistic descriptions
and PWA workshops, eg Abilene, Zagreb, Tuzla
12) Symmetries
13) FB systems ideal for “new physics” search - weak charge of p (Jlab) - K*N scatt. length to test χSB in systems with strangenness using DEAR and SIDDHARTA
14) New facilities: Bernal – Polanyi polemics15) “Discrepancies” solved using “proper” “3NF” or ? However, there are other “discrepancies”16) Therefore, several approaches desirable17) Rennaisance of nuclear physics