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**Type of paper**:*Paper in journal*

**Title:**

**Type of paper**:*Paper in journal*

**Title:**Vector mesonic phase and the chiral bag model

**Authors:**- Podobnik, Boris
- HORVAT, DUBRAVKO (98703)
- Tadiæ, Dubravko (48880)

**Journal**: Fizika B

**Number**: 1

**ISSN**: 1330-0016

**Volume**: 2

**Year**: 1993

**Pages**: from 49 to 71

**Number of references**: 11

**Language**: engleski

**Summary**: The mesonic sector of the standard chiral bag model was enlarged to include the vector and axial vector components. New model openly displays the current field identities. It's predictions are close to the older model. This seems to be consequence of the chiral invariance and of the PCAC and CVC constraints. Particle masses, the axial-vector coupling constant, the proton magnetic moment and the charge radius have been calculated.

**Keywords**: vector mesons, chiral symmetry, bag model, PCAC

**Type of paper**:*Paper in journal*

**Title:**A non-hedgehog solutions for the chiral bag

**Authors:**- HORVAT, DUBRAVKO (98703)
- Podobnik, Boris
- Tadiæ, Dubravko (48880)

**Journal**: Fizika B

**Number**: 1

**ISSN**: 1330-0016

**Volume**: 4

**Year**: 1995

**Pages**: from 71 to 91

**Number of references**: 15

**Language**: engleski

**Summary**: The chiral sigma model, embedded in the chiral-bag environment is solved by an ansatz which conserves isospin and spin separably. The chiral ansatz is treated in two ways: i) as a set of operator equations of motion solved between quark states and ii) the Hamiltonian operator is averaged between suitable hadron states and the equations of motion are dervied for these mean fields. The second approach is completely analogous to the usual one which employs hedgehog quarks, which is also reproduced here. It turns out that the energy minimum (i.e. hadron masses) can be found with chiral quarks as well as with hedgehog quarks. Model predictions for the axial-vector coupling constant and for the nucleon magnetic moment obtained with chiral quarks are of the same quality or better than those obtained using the usual hedgehog-based approximation.

**Keywords**: chiral symmetry, linear sigma model, hedgehog , bag model

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