Bose-Einstein Correlations at fixed multiplicities in the quantum optical approach

1. Bose-Einstein Correlations at fixed multiplicities in the quantum optical approach N. Suzuki, Matsumoto Univ., Japan M. Biyajima, Shinshu Univ., Japan

2. Contents 1.Introduction 2.Momentum distributions at fixed n 3.Formulation in the quantum optical approach 4.Data analysis Multiplicity distribution BEC (q-long, q-side distributions ) 5.Summary

3. 1.Introduction Semi-inclusive events If these distributions are constructed from the same data samples, Parameters on the BEC (cf. source radius, which is estimated from the 2-body BEC) are included in the multiplicity distribution. • 2-particle Bose-Einstein correlation function • Multiplicity distribution • One-particle momentum density • Two-particle momentum density

4. 2.Momentum distributions in the semi-inclusive events

6. 3. Formulation in the quantum-optical approach

7. 3-1.Parametrization

8. 3-2.Multiplicity distribution in the QO approach • KNO scaling function The MD is approximately given by the Glauber-Lachs formula.

9. 4.Data analysis (MD)

10. 4-2. Analysis of BEC ALICE collaboration Phys. ReV. D84,112044(2011) pp 7 TeV, |η|<1.2 • q-long distribution : • q-side distribution :

15. 5. Summary • q-long distribution :