Looking for disoriented chiral condensates from pion distributions
- Department of Physics, University of Maryland, College Park, Maryland 20742-4111 (United States)
We suggest two methods for the detection of the formation of disoriented chiral condensates (D{chi}C) in heavy ion collisions. We show that the variance in the number of charged pions (in a suitable range of momentum space) provides a signature for the observation of a disoriented chiral condensate. The signal should be observable even if multiple domains of D{chi}C form provided the average number of pions per domain is significantly larger than unity. The variance of the number of charged pions alone provides a signal which can be used even if the number of neutral pions cannot be measured in a given detector. On the other hand, the probability distribution in {ital R}, the proportion of neutral pions to all pions emitted in heavy ion collisions in certain kinematic regions, has been suggested as a signal of a disoriented chiral condensate. Here we note that the signature can be greatly enhanced by making suitable cuts in the data. In particular, we consider reducing the data set such that the {ital k} pions with lowest p{sub T} are all neutral. We find that, given such cuts, {l_angle}R{r_angle} can be substantially different from 1/3. For example, for a single D{chi}C domain without contamination due to incoherently emitted pions, {l_angle}R{r_angle} is 3/5 given the pion with lowest p{sub T} is neutral, and 5/7 given the two pions with lowest p{sub T} are both neutral, etc. The effects of multidomain D{chi}C formation and noise due to incoherent pion emission can be systematically incorporated. Potential applications to experiments and their limitations are briefly discussed. {copyright} {ital 1999} {ital The American Physical Society}
- OSTI ID:
- 688067
- Journal Information:
- Physical Review, C, Journal Name: Physical Review, C Journal Issue: 5 Vol. 60; ISSN 0556-2813; ISSN PRVCAN
- Country of Publication:
- United States
- Language:
- English
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