System size, energy, and centrality dependence of pseudorapidity distributions of charged particles in relativistic heavy-ion collisions.
نویسندگان
چکیده
We present the first measurements of the pseudorapidity distribution of primary charged particles in Cu+Cu collisions as a function of collision centrality and energy, sqrt[s_{NN}]=22.4, 62.4, and 200 GeV, over a wide range of pseudorapidity, using the PHOBOS detector. A comparison of Cu+Cu and Au+Au results shows that the total number of produced charged particles and the rough shape (height and width) of the pseudorapidity distributions are determined by the number of nucleon participants. More detailed studies reveal that a more precise matching of the shape of the Cu+Cu and Au+Au pseudorapidity distributions over the full range of pseudorapidity occurs for the same N{part}/2A rather than the same N_{part}. In other words, it is the collision geometry rather than just the number of nucleon participants that drives the detailed shape of the pseudorapidity distribution and its centrality dependence at RHIC energies.
منابع مشابه
Hadron production in heavy relativistic systems
We investigate particle production in heavy-ion collisions at RHIC energies as function of incident energy, and centrality in a three-sources Relativistic Diffusion Model. Pseudorapidity distributions of produced charged hadrons in Au + Au and Cu + Cu collisions at √ sNN = 19.6 GeV, 62.4 GeV, 130 GeV and 200 GeV show an almost equilibrated midrapidity source that tends to increase in size towar...
متن کاملX iv : n uc l - ex / 0 41 10 12 v 2 2 9 N ov 2 00 4 Studies of multiplicity in relativistic heavy - ion collisions
In this talk I'll review the present status of charged particle multiplicity measurements from heavy-ion collisions. The characteristic features of multiplicity distributions obtained in Au+Au collisions will be discussed in terms of collision centrality and energy and compared to those of p+p collisions. Multiplicity measurements of d+Au collisions at 200 GeV nucleon-nucleon center-of-mass ene...
متن کاملar X iv : n uc l - ex / 0 41 10 12 v 1 8 N ov 2 00 4 Studies of multiplicity in relativistic heavy - ion collisions
In this talk I'll review the present status of charged particle multiplicity measurements from heavy-ion collisions. The characteristic features of multiplicity distributions obtained in Au+Au collisions will be discussed in terms of collision centrality and energy and compared to those of p+p collisions. Multiplicity measurements of d+Au collisions at 200 GeV nucleon-nucleon center-of-mass ene...
متن کامل1 2 Ju n 20 09 Center of mass energy and system - size dependence of photon production at forward rapidity at RHIC
We present the multiplicity and pseudorapidity distributions of photons produced in Au+Au and Cu+Cu collisions at √ sNN = 62.4 and 200 GeV. The photons are measured in the region −3.7 < η < −2.3 using the photon multiplicity detector in the STAR experiment at RHIC. The number of photons produced per average number of participating nucleon pairs increases with the beam energy and is independent ...
متن کاملQuark participants and global observables
One of the challenges in relativistic heavy ion collisions is to measure and study the large number of particles produced in such reactions. Measurement of particle density and transverse energy density in rapidity is a convenient way to describe particle production in heavy ion collisions. The pseudorapidity density (dN/dη) and transverse energy pseudorapidity density (dET /dη) at mid-rapidity...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Physical review letters
دوره 102 14 شماره
صفحات -
تاریخ انتشار 2009