123588442
A search for structure in charged meson spectra from proton-antiproton annihilations at rest
The charged meson momentum spectra from pp annihilation at rest have been measured with high statistics. A search is made for structures between 150 and 300 MeV/c which indicate narrow baryonium states. We find four narrow lines which are identified with the absorption and decay processes of kaons stopping in the target. No other narrow structures are seen, giving limits of 2−6×10−4 p (90% CL) for the yield of a narrow state in the mass range 1510–1660 MeV.
118019702
Search for resonance structures in inclusive charged pion spectra from p̄p annihilation at rest
The charged pion momentum spectra from pp annihilation at rest have been measured with high statistics. A search for structures finds four narrow lines which are identified with the absorption and decay processes of kaons stopping in the target. Limits of 1‐6×10−4/p (90% C.L.) are placed on the yield of a narrow state in the mass range 1000–1660 MeV.
39950378
Measurement of the gamma gamma partial width of the chi 2 charmonium resonance.
The E760 Collaboration has studied the reaction [ital [bar p]p][r arrow][chi][sub 2][r arrow][gamma][gamma] using a hydrogen gas jet target in the Fermilab antiproton acumulator ring. The following values are obtained for the branching ratio and partial width to two photons; [ital B]([chi][sub 2][r arrow][gamma][gamma])=(1.60[plus minus]0.45)[times]10[sup [minus]4] and [Gamma]([chi][sub 2][r arrow][gamma][gamma])=321[plus minus]95 eV.
125360362
A program to measure the direct CP violating decay K(L) --> pi0 nu anti-nu and other rare decays at Fermilab using the main injector
126084521
Measurements of the widths of charmonium states at the Fermilab anti-p accumulator ring
116924174
Search for new strange resonances in inclusive charged kaon spectra from p̄p annihilation at rest
Charged spectra from pp annihilations at rest have been measured using the PS183 spectrometer at LEAR. From these data, charged kaon spectra are produced using time‐of‐flight separation. The spectra show structures corresponding to annihilation into the K±K−+ and K*±K−+ channels. A search for structures indicating other resonances is discussed.
119152850
Wakes in a collisional quark-gluon plasma
Wakes created by a parton moving through a static and infinitely extended quark?gluon plasma are considered. In contrast to former investigations, collisions within the quark?gluon plasma are taken into account using a transport theoretical approach (Boltzmann equation) with a Bhatnagar?Gross?Krook collision term. Within this model, it is shown that the wake structure changes significantly compared to the collisionless case.
116271100
Correlation between conserved charges in PNJL Model with multi-quark interactions
We present a study of correlations among conserved charges like baryon number, electric charge and strangeness in the framework of 2+1 flavor Polyakov loop extended Nambu-Jona-Lasinio model at vanishing chemical potentials, up to fourth order. Correlations up to second order have been measured in Lattice QCD which compares well with our estimates given the inherent difference in the pion masses in the two systems. Possible physical implications of these correlations and their importance in understanding the matter obtained in heavy-ion collisions are discussed. We also present comparison of the results with the commonly used unbound effective potential in the quark sector of this model.
119295507
Heavy lepton pair production in nucleus–nucleus collisions at LHC energy – a case study
Abstract We present a study of τ + τ − lepton pair production in Pb + Pb collisions at s NN = 5.5 TeV . The larger τ ± mass (∼1.77 GeV) compared to e ± and μ ± leads to considerably small hadronic contribution to the τ + τ − pair invariant mass ( M ) distribution relative to the production from thermal partonic sources. The quark–anti-quark annihilation processes via intermediary virtual photon, Z and Higgs bosons have been considered for the production of τ + τ − . We observe that the contribution from Drell–Yan process dominates over thermal yield for τ + τ − pair mass from 4 to 20 GeV at the LHC energy. We also present the ratio of τ lepton pair yields for nucleus–nucleus collisions relative to yields from p + p collisions scaled by number of binary collisions at LHC energies as a function τ pair mass. The ratio is found to be significantly above unity for the mass range 4 to 6 GeV. This indicates the possibility of detecting τ + τ − pair from quark–gluon plasma (QGP) in the mass window 4 ⩽ M (GeV) ⩽ 6 .
15200778
Measuring cosmic defect correlations in liquid crystals
From the theory of topological defect formation proposed for the early universe, the so called Kibble mechanism, it follows that the density correlation functions of defects and anti-defects in a given system should be completely determined in terms of a single length scale $\xi$, the relevant domain size. Thus, when lengths are expressed in units of $\xi$, these distributions should show universal behavior, depending only on the symmetry of the order parameter, and space dimensions. We have verified this prediction by analyzing the distributions of defects/anti-defects formed in the isotropic-nematic phase transition in a thin layer of nematic liquid crystals. Our experimental results confirm this prediction and are in reasonable agreement with the results of numerical simulations.
41160767
Chiral dynamics in QCD at finite chemical potential
We present the renormalized Taylor expansion of the chiral condensate with chemical potential. The relation with the Taylor coefficients of meson susceptibilities and the quark mass dependence of the quark number susceptibilities are obtained through chiral Ward identities and Maxwell relations. The continuum limit is obtained in quenched and two flavor QCD. In N{sub f}=2 QCD, the quadratic response coefficients of the chiral condensate to chemical potential indicate that pion fluctuations decrease at finite chemical potential toward the critical end point. We discuss how these observables can be used to test other features of the QCD phase diagram.