Multiplicity dependence of the transverse-momentum spectrum for centrally produced hadrons in antiproton-proton collisions at√s =1.8TeV

Abstract

The transverse momentum of charged particles produced within the pseudorapidity range g = -0.36 to +1. 0 has been measured in pp collisions at Js 1.8 TeV. The charged-particle multiplicity of each event was measured with a 240-element cylindrical hodoscope system covering the range -3.25 ( g (3.25. The average transverse momentum as a function of the average charged-particle density per unit of pseudorapidity is presented. Events are observed with average charged-particle density as high as 32 per unit of pseudorapidity.PACS numbers: 13.85.HdIn this Letter, we report the first results of an experiment performed at the CO intersection region of the Fermilab Pp collider at a center-of-mass energy Js =1.8TeV. The experiment was designed to search for evidence of a phase transition of hadronic matter to a deconfined quark-gluon state. During the first running period, 5x10 triggers were collected from a total integrated luminosity of = 3 nb We report measurements of the correlation between the average transverse momentum (p, ) and the chargedparticle multiplicity in the central rapidity region. The (p, ) may be interpreted as a measure of the temperature of the hadronic matter formed in the collisions, while the particle density in rapidity is proportional to its entropy density.Structure in the distribution of (p, ) versus multiplicity, in particular, a rise in (p, ) followed by a plateau and a second rise after the plateau, could be interpreted as one of the signatures of a phase transition in hadronic matter. Similar measurements at lower center-of-mass energies have previously been made in a cosmic-ray experiment, at the CERN ISR, and at the CERN SppS collider.There are also high-energy, heavy-ion programs now underway at CERN and Brookhaven with fixed targets.Our detector consists of a 240-element multiplicity hodoscope surrounding the interaction region, a trigger system, and a magnetic spectrometer at 90 which samples the charged-particle spectrum with a solid angle of 0.5 sr.

Transverse-momentum and pseudorapidity distributions of charged hadrons in pp collisions at $\sqrt{s} = 0.9 $ and 2.36 TeV

“…Data of other experiments are taken from refs. [22,[31][32][33]. The curve shows the fit to the data points of the form p T = 0.425−0.0197 ln(s)+ 0.00156 ln 2 (s) with p T in GeV/c and s in GeV 2 .…”

Global properties of proton-proton collisions at s = 100 $$ \sqrt{\mathrm{s}}=100 $$ TeV

“…Right: evolution of p T at midrapidity as a function of c.m. energy √ s. Data points show existing collider results [63,66,67,70,76,77], and the vertical line indicates the FCC-hh/SppC energy.…”

Analysis of Methods and Practical Application of Hash Functions

“…In accordance with the principle of isotopic invariance, the number of neutral pions should be equal to the number of charged pions. The event, which was recorded by Japanese physicists, contained only charged peonies with no neutral [1]. This event was named "Centaur".…”

“…This event was named "Centaur". Further experiments with a similar technique performed in different collaborations (collaboration "Pamir" [2], Japanese-Brazilian collaboration [1], etc. ), were aimed at finding such events.…”

“…Statistics of Centaur events accumulated in different experiments [1][2][3] Laboratories Height m (g/cm 2 ) The table shows that the number of Centaur events is small. Thus, the discovery of this phenomenon remains questionable due to poor statistical availability.…”