期刊：
PROCEEDINGS OF THE XXVI INTERNATIONAL SYMPOSIUM ON MULTIPARTICLE DYNAMICS,1997年:343-350
通讯作者：
Liu, LS
作者机构：
[Wu, YF; Liu, LS] Huazhong Normal Univ, Inst Particle Phys, Wuhan, Peoples R China.
通讯机构：
[Liu, LS] H;Huazhong Normal Univ, Inst Particle Phys, Wuhan, Peoples R China.
摘要：
It is argued that the scaling property of higher dimensional normalized factorial moments depends essentially on the different ways of phase space division. The later can be characterized by the log ratio of partition number in different directions of phase space. Two examples are given. Firstly, a self-affine analysis of factorial moments was carried out on the NA22 data for pi(+)p and K(+)p collisions at 250 GeV/c. It turns out that the Hurst exponent is only one half when the longitudinal direction is compared to the transverse ones, providing a first experimental evidence on the anisotropy of dynamical fluctuation in multiparticle production. A discussion on the similar analysis for heavy ion collision data is presented as a second example. The experimentally observed strong upward-bending of the logarithm of factorial moments versus that of the phase space partition number in higher-dimensional phase space of nucleus-nucleus collisions is shown to be due to the superposition of elementary collision processes in these collisions. A trigger condition for the search of QGP is proposed basing on this phenomenon.
摘要：
Taking into account the anisotropy of phase space in multiparticle production, a self-affine analysis of factorial moments was carried out on the NA22 data for pi(+)p and K(+)p collisions at 250 GeV/c. Within the transverse plane, the Hurst exponents measuring the anisotropy are consistent with unit value (i.e, no anisotropy). They are, however, only half that value when the longitudinal direction is compared to the transverse ones. Fractality, indeed, turns out to be self-affine rather than self-similar in multiparticle production. In three-dimensional phase space, power-law scaling is observed to be better realized in self-affine than in self-similar analysis.
作者机构：
Inst. für Theoretische Physik, Universität Regensburg, D-93040 Regensburg, Germany;Institute of Particle Physics, Hua-Zhong Normal University, Wuhan, China
通讯机构：
Inst. für Theoretische Physik, Universität Regensburg, Germany
摘要：
We discuss the Yano-Koonin-Podgoretskii (YKP) parametrization of the two-particle correlation function for azimuthally symmetric expanding sources. We derive model-independent expressions for the YKP fit parameters and discuss their physical interpretation. We use them to evaluate the YKP fit parameters and their momentum dependence for a simple model for the emission function and propose new strategies for extracting the source lifetime. Longitudinal expansion of the source can be seen directly in the rapidity dependence of the Yano-Koonin velocity.
通讯机构：
[WU, YF] H;HUAZHONG NORMAL UNIV,INST PARTICLE PHYS,WUHAN 430070,PEOPLES R CHINA.
关键词：
HIGH ENERGY MULTIPARTICLE PRODUCTION;LONGITUDINAL PHASE SPACE;DYNAMICAL FLUCTUATION;AVERAGE TRANSVERSE MOMENTUM
摘要：
The highly anisotropic phase space (known as longitudinal phase space) of multiparticle final states in high energy hh collisions is studied in detail. It is pointed out that the anisotropy of phase space should manifest itself not only in the dramatic difference in magnitude between the average transverse and longitudinal momenta, but also in the anisotropy of dynamical fluctuations in the two directions. It means that the particle distribution in phase space has the property of selfaffine fractal. A method for experimentally testing the selfaffine fractality and measuring its characteristic parameterHurst exponent is given. In addition, the correlation between the degree of longitudinal fractality and the magnitude of average transverse momentum is discussed. A new characteristic quantity- average transverse momentum per event- for de scribing the dynamical property of an event (hard, soft or ultrasoft) is proposed. A comparison of the results with experimental data is given.
摘要：
The anomalous scaling of factorial moments with continuously diminishing scale is studied using a random cascading model. It is shown that the model currently used have the property of anomalous scaling only for descrete values of elementary cell size. A revised model is proposed which can give good scaling property also for continuously varying scale. It turns out that the strip integral has good scaling property provided the integral regions are chosen correctly, and that this property is insensitive to the concrete way of self-similar subdivision of phase space in the models.
作者机构：
[WU, YF; ZHANG, Y; LIU, LS] Institute of Particle Physics, Hua-Zhong Normal University, Wuhan 430070, China
通讯机构：
[WU, YF] H;HUA ZHONG NORMAL UNIV,INST PARTICLE PHYS,WUHAN 430070,PEOPLES R CHINA.
摘要：
The experimental results on factorial moments (FM’s) in different phase space dimensions are examined in some detail. The general trends of one- and three-dimensional FM’s and the complexity of the two-dimensional ones are pointed out. It is shown that all the complicated patterns of FM’s in different dimensions can be understood comprehensively under the assumption of self-affine fluctuations in 3D, which means that anomalous scaling of FM’s may exist in multiparticle final states provided the shrinkage of phase space is done correctly according to the anisotropic property of multiplicity fluctuations.
作者机构：
[WU, YF; LIU, LS] Institute of Particle Physics, Hua-Zhong Normal Univeristy, Wuhan 430 070, People’s Republic of China
通讯机构：
[WU, YF] H;HUA ZHONG NORMAL UNIV,INST PARTICLE PHYS,WUHAN 430070,PEOPLES R CHINA.
摘要：
It is argued that, accounting for the anisotropy of phase space, the local fluctuations of multiplicity in high energy multiparticle production are self-affine rather than self-similar. Evidence is given confirming self-affinity in phase-space distributions. A method is proposed to extract the characteristic parameter of self-affinity, the Hurst exponent, from the experimental data iteratively.
期刊：
EUROPEAN PHYSICAL JOURNAL C,1992年53(2):273-275 ISSN：1434-6044
通讯作者：
WU, YF
作者机构：
[WU, YF; LIU, LS] Institute of Particle Physics, Hua-Zhong Normal University, Wuhan, People's Republic of China
通讯机构：
[WU, YF] H;HUA ZHONG NORMAL UNIV,INST PARTICLE PHYS,WUHAN 490070,PEOPLES R CHINA.
摘要：
The dependences of intermittency degree on moment-order, multiplicity and transverse momentum are discussed. The different dependences of intermittency degree on moment order at different energies are utilized to show that the dependences of intermittency degree on multiplicity are in opposite directions in low and high energy regimes. It is argued that these different trends imply that intermittency degree depends on other more basic quantity, such as transverse momentum.
作者机构：
[WU, YF; LIU, LS] Institute of Particle Physics, Hua-Zhong Normal University, Wuhan, 430070 China
通讯机构：
[WU, YF] H;HUA ZHONG NORMAL UNIV,INST PARTICLE PHYS,WUHAN 430070,PEOPLES R CHINA.
摘要：
The conditional entropy and mutual information of two neighboring generations of division are proposed as characteristics to use in analyzing the random cascading mechanism in multiparticle production. It is shown that these characteristics are effective in examining the existence and property of self-similar cascading, provided the multiplicities of the events in consideration are high enough.
作者机构：
Institute of Particle Physics, Hua-Zhong Normal University, Wuhan 430070, China
通讯机构：
[WU, YF] H;HUA ZHONG NORMAL UNIV,INST PARTICLE PHYS,WUHAN 430070,PEOPLES R CHINA.
摘要：
The experimentally observed "low p(T) intermittency" is shown to be due to the dependence of the degree of intermittency on average transverse momentum per event. It confirms the importance of (ultra-)soft processes in the appearance of intermittency phenomena and supports the assertion that the degree of the intermittency depends basically on the average transverse momentum rather than on multiplicity.
