1,523 research outputs found
Kaon and Pion Ratio Probes of Jet Quenching in Nuclear Collisions
Non-abelian energy loss in quark gluon plasmas is shown to lead to novel
hadron ratio suppression patterns in ultrarelativistic nuclear collisions. We
apply GLV estimates for the gluon radiative energy loss. The K^-/K^+ and
K^+/\pi^+ ratios are found to be most sensitive to the initial density of the
plasma.Comment: 10 pages in Latex, 6 EPS figure
K+/pi+ probes of jet quenching in AA collisions
Non-abelian energy loss in quark gluon plasma is shown to lead to novel
hadron ratio suppression patterns in ultrarelativistic nuclear collisions. We
apply recent (GLV) estimates for the gluon radiative energy loss, which
increases linearly with the jet energy up to E<20 GeV and depends quadratically
on the nuclear radius, R. The K+/\pi+ ratio is found to be most sensitive to
the initial density of the plasma.Comment: Presented at 6th International Conference on Strange Quarks in
Matter: 2001: A Flavourspace Odyssey (SQM2001), Frankfurt, Germany, 25-29 Sep
200
Non-Abelian Bremsstrahlung and Azimuthal Asymmetries in High Energy p+A Reactions
We apply the GLV reaction operator solution to the Vitev-Gunion-Bertsch (VGB)
boundary conditions to compute the all-order in nuclear opacity non-abelian
gluon bremsstrahlung of event-by-event fluctuating beam jets in nuclear
collisions. We evaluate analytically azimuthal Fourier moments of single gluon,
, and even number gluon, inclusive
distributions in high energy p+A reactions as a function of harmonic ,
%independent target recoil cluster number, , and gluon number, , at
RHIC and LHC. Multiple resolved clusters of recoiling target beam jets together
with the projectile beam jet form Color Scintillation Antenna (CSA) arrays that
lead to characteristic boost non-invariant trapezoidal rapidity distributions
in asymmetric nuclear collisions. The scaling of intrinsically
azimuthally anisotropic and long range in nature of the non-abelian \br
leads to moments that are similar to results from hydrodynamic models,
but due entirely to non-abelian wave interference phenomena sourced by the
fluctuating CSA. Our analytic non-flow solutions are similar to recent
numerical saturation model predictions but differ by predicting a simple
power-law hierarchy of both even and odd without invoking
factorization. A test of CSA mechanism is the predicted nearly linear
rapidity dependence of the . Non-abelian beam jet \br may thus
provide a simple analytic solution to Beam Energy Scan (BES) puzzle of the near
independence of moments observed down to 10 AGeV where
large valence quark beam jets dominate inelastic dynamics. Recoil \br from
multiple independent CSA clusters could also provide a partial explanation for
the unexpected similarity of in and non-central at same
multiplicity as observed at RHIC and LHC.Comment: 16 pages, 10 figure
Charge Particle Angular Correlations from Leading Photons at RHIC
We report on the observation of jet-like azimuthal and pseudorapidity
correlations between the highest photon (leading photon) and charged
hadrons produced in both p+p and Au+Au collisions at GeV.Comment: 4 pages, 3 figures. Talk given at Quark Matter 2002 (QM 2002),
Nantes, Bretagne, France, 18-24 Jul 200
Jet Tomography of Au+Au Reactions Including Multi-gluon Fluctuations
Jet tomography is the analysis of the attenuation pattern of high transverse
momentum hadrons to determine certain line integral transforms of the density
profile of the QCD matter produced in ultra-relativistic nuclear collisions. In
this letter, we calculate the distortion of jet tomography due to multi-gluon
fluctuations within the GLV radiative energy loss formalism. We find that
fluctuations of the average gluon number, ~ 3 for RHIC initial
conditions, reduce the attenuation of pions by approximately a factor Z ~
0.4-0.5. Therefore the plasma density inferred from jet tomography without
fluctuations must be enhanced by a factor 1/Z ~ 2.Comment: 6 pages, 4 .eps figures, uses REVTEX and bbox.st
Jet Tomography Studies in AuAu Collision at RHIC Energies
Recent RHIC results on pion production in AuAu collision at sqrt(s)=130 and
200 AGeV display a strong suppression effect at high p_T. This suppression can
be connected to final state effects, namely jet energy loss induced by the
produced dense colored matter. Applying our pQCD-based parton model we perform
a quantitative analysis of the measured suppression pattern and determine the
opacity of the produced deconfined matter.Comment: Talk given at European Physical Society International Europhysics
Conference on High Energy Physics HEP2003, July 17-23. 2003, in Aachen,
Germany 3 pages in LaTeX, 2 EPS figure. (Accepted for publication in European
Physical Journal C direct
New features of scattering from a one-dimensional non-Hermitian (complex) potential
For complex one-dimensional potentials, we propose the asymmetry of both
reflectivity and transmitivity under time-reversal: and , unless the potentials are real or PT-symmetric. For complex
PT-symmetric scattering potentials, we propose that
and . So far, the spectral singularities (SS) of a one-dimensional
non-Hermitian scattering potential are witnessed/conjectured to be at most one.
We present a new non-Hermitian parametrization of Scarf II potential to reveal
its four new features. Firstly, it displays the just acclaimed (in)variances.
Secondly, it can support two spectral singularities at two pre-assigned real
energies () either in or in , when
. Thirdly, when it possesses one SS in
and the other in . Fourthly, when the potential becomes PT-symmetric
, we get , it possesses a unique SS at
in both and . Lastly, for completeness, when
and , there are no SS, instead we get two
negative energies and of the complex PT-symmetric Scarf
II belonging to the two well-known branches of discrete bound state eigenvalues
and no spectral singularity exists in this case. We find them as
and ; with
.
{PACS: 03.65.Nk,11.30.Er,42.25.Bs}Comment: 10 pages, one Table, one Figure, important changes, appeared as an
FTC (J. Phys. A: Math. Theor. 45(2012) 032004
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