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Charge Fluctuations in π+ p and + p Collisions at 250GeV/c Yuanfang Wu 1. Introduction

Charge Fluctuations in π+ p and + p Collisions at 250GeV/c Yuanfang Wu 1. Introduction 2. Results • The dependency of charge fluc. on Y • The dependency of charge fluc. on n 3. Summary. Introduction ► Charge fluc. → a new signal of QGP PT ► Measures

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Charge Fluctuations in π+ p and + p Collisions at 250GeV/c Yuanfang Wu 1. Introduction

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  1. Charge Fluctuations in π+pand +p Collisions at 250GeV/c Yuanfang Wu 1. Introduction 2. Results • The dependency of charge fluc. on Y • The dependency of charge fluc. on n 3. Summary

  2. Introduction • ►Charge fluc.→ a new signal of QGP PT • ►Measures • charge ratio fluc.: • net charge fluc.:

  3. Introduction • ► Theoretical predictions for D-measures • Random: D(Q) ~ 4 • HG: D(R) ~ 3 - 4 • QGP : D(R) ~ 0.75 - 1 • ►Corrections • ►Motivations • • Which measure is better and if the corr. are proper? • • Data on h-h collisions is absent.

  4. Introduction • ►Data : • π+ pand + p Collisions at 250GeV/c • ( NA22 Coll. ) • A total of 44 524 NSD events0.001GeV/c < pt < 10 GeV/c full 4π acceptance

  5. 2. Results •The dependency of the fluc. on Y 1) & 2) & 3) &

  6. 2. Results • nch dis. for diff. |y| < ycut 1) |y|<2, even & odd are the same. 2) |y|<2.5, even & odd start to separate. It first happens at large nch. 3) full range, only even left.

  7. 2. Results • The dependency of the fluc. on nchat |y| < 2.5

  8. 2. Results• The dependency of the fluc. on nch at |y|<3

  9. 3. Summary ☺ and both have strong Δy dependence. ☺ in diff. Δy are much smaller than those of random and HG, but pass through the band of QGP . stays between the bands of HG and QGP and show no Δy dependence at large Δy. ☺The and develop a peak with increasing of Δy, lying partly in the bands for a HG and a QGP, respectively, but their corrected versions always above the band for the HG and keep increasing with the size of Δy.

  10. 3. Summary ☺ and both have nch dependence. ☺ has better record in net charge fluc. between even and odd nch than the charge ratio ones. ☺ smear the existent differences between even and odd charged nch, while the make their nch dependence disappear within experimental errors. ☺PYTHIA can reproduce the net charge and charge ratio fluc. in different Ycut and for different nch. However, PYTHIA over-estimates the fluc. of odd nch at |y|<3.

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