PIONS in DIS Bogdan Povh Max-Planck-Institut fuer Kernphysik.

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Presentation transcript:

PIONS in DIS Bogdan Povh Max-Planck-Institut fuer Kernphysik

Pion signature in experiment: Gottfried Sum rule Polarized structure function Forward neutrons in DIS

DIS on Proton and Deuteron Gottfried sum rule Spin structure function

Pion signature NMC detector at CERN Deep inelastic scattering of muons off protons and deuterons

Pion signature Gottfried sum rule for flavour symmetric sea

Pion signature

SU(2) chiral model Eichten, Hinchliffe, Quigg Phys.Rev.D 45 1992 Baumgaertner, Pirner, Koenigsmann, P. ZP A 353 1996 Pirner Prog. Part. Nucl. Phys. 36 1996

Pion signature SU(2) chiral model:pion is a short cut for the quark-antiquark pair of the constituent quark From GSR

Spin Structure function “Theoretical predictions using SU(3) Flavor model”:(Cabibbo, Nucl.Phys.B69,1974) F+D=g_A, F-D=-0.34 and the experiment disagree:1/3 of the prediction New value: quark carries 1/3 of the spin of the constituent quark

SU(2) chiral model from g_A

Pion signature SU(2) chiral model

Forward Neutron Calorimeters at H1 and ZEUS at DESY

FNC – design specifications The size and weight of FNC is defined by the space available in HERA tunnel position– 105m from the interaction point, size ~ 70 x 70 x 200cm3 , weight <10t geometrical acceptance is limited by beam-line elements <0.8mrad should work in high radiation environment A.Bunyatyan “Physics with FNC”

Pion signature H1 detector at HERA collider

A.Bunyatyan “Physics with FNC”

Neutron and photon energy spectrum measured in H1 -cluster in Preshower = photon, -cluster in main calorimeter and/or Preshower = neutron A.Bunyatyan “Physics with FNC”

Different pion fluxes used in analysis (different form factors)

Pion signature Estimation of the probability of the p→n+p+ in DIS from the neutron rate in DIS extrapolating to the full energy range (for 2 different pion fluxes} (Bunyatyan, Povh, EPJ A27,2006), Absorption (D’Alesio&Pirner EPJ A7 2000)

Only one U quark contribute

The spin-flavor function symmetric

Conclusions

In the first order the nucleon is composed of three quarks and one quark-antiquark pair. One quarter of the quark-antiquark pair shows up as a pion of the nucleon

Conclusions The constituent quarks are a superposition of the massive quarks and pions

Spontaneous breaking of the chiral symmetry and fossil pions

Microscopic view of the chiral symmetry breaking Conclusions Microscopic view of the chiral symmetry breaking d u The interaction that is responsible for giving the mass to quarks binds quark-antiquark to a pion

Chiral symmetry breaking Peak of valence quarks

Chiral symmetry breaking

Chiral symmetry breaking

Chiral symmetry breaking Nambu-Jona-Lasinio Model

Chiral symmetry breaking

Nambu-Jona-Lasinio Model in Cartoons Chiral symmetry breaking Nambu-Jona-Lasinio Model in Cartoons