Factorial and cumulant moments in e+e− → hadrons at the Z0 resonance

Adelphi University, Garden City, NY 11530, USA; INFN Sezione di Bologna, I-40126 Bologna, Italy; Boston University, Boston, MA 02215, USA; Brunel University, Uxbridge, Middlesex UB8 3PH, United Kingdom; University of California at Santa Barbara, Santa Barbara, CA 93106, USA; University of California at Santa Cruz, Santa Cruz, CA 95064, USA; University of Cincinnati, Cincinnati, OH 45221, USA; Colorado State University, Fort Collins, CO 80523, USA; University of Colorado, Boulder, CO 80309, USA; Columbia University, New York, NY 10027, USA; INFN Sezione di Ferrara and Università di Ferrara, I-44100 Ferrara, Italy; INFN Lab. Nazionali di Frascati, I-00044 Frascati, Italy; University of Illinois, Urbana, IL 61801, USA; Lawrence Berkeley Laboratory, University of California, Berkeley, CA 94720, USA; Massachusetts Institute of Technology, Cambridge, MA 02139, USA; University of Massachusetts, Amherst, MA 01003, USA; University of Mississippi, University, MS 38677, USA; Nagoya University, Chikusa-ku, Nagoya 464, Japan; University of Oregon, Eugene, OR 97403, USA; INFN Sezione di Padova and Università di Padova, I-35100 Padova, Italy; INFN Sezione di Perugia and Università di Perugia, I-06100 Perugia, Italy; INFN Sezione di Pisa and Università di Pisa, I-56100 Pisa, Italy; Rutgers University, Piscataway, NJ 08855, USA; Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, United Kingdom; Sogang University, Seoul, South Korea; Stanford Linear Accelerator Center, Stanford University, Stanford, CA 94309, USA; University of Tennessee, Knoxville, TN 37996, USA; Tohoku University, Sendai 980, Japan; Vanderbilt University, Nashville, TN 37235, USA; University of Washington, Seattle, WA 98195, USA; University of Wisconsin, Madison, WI 53706, USA; Yale University, New Haven, CT 06511, USA
Physics Letters B DOI: 10.1016/0370-2693(96)00046-9

ABSTRACT We present the first experimental study of the ratio of cumulant to factorial moments of the charged-particle multiplicity distribution in high-energy particle interactions, using hadronic Z0 decays collected by the SLD experiment at SLAC. We find that this ratio, as a function of the moment-rank q, decreases sharply to a negative minimum at q = 5, which is followed by quasi-oscillations. These features are insensitive to experimental systematic effects and are in qualitative agreement with expectations from next-to-next-to-leading-order perturbative QCD.


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May 20, 2014