S. S. Adler
A5103182412- High-Energy Particle Collisions Research
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Nuclear reactor physics and engineering
- Dark Matter and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Particle Detector Development and Performance
- Stochastic processes and statistical mechanics
- Radiation Detection and Scintillator Technologies
- Nuclear physics research studies
- X-ray Spectroscopy and Fluorescence Analysis
- Theoretical and Computational Physics
- Neutrino Physics Research
- Computational Physics and Python Applications
- Markov Chains and Monte Carlo Methods
- Physics of Superconductivity and Magnetism
- Particle accelerators and beam dynamics
- Advanced Thermodynamics and Statistical Mechanics
- CCD and CMOS Imaging Sensors
- Quantum many-body systems
- Advanced Physical and Chemical Molecular Interactions
- Cold Atom Physics and Bose-Einstein Condensates
- Particle Accelerators and Free-Electron Lasers
- Prostate Cancer Diagnosis and Treatment
- Spectral Theory in Mathematical Physics
Brookhaven National Laboratory
2001-2013
The University of Tokyo
2005
University of Bonn
2001
The anisotropy parameter (v(2)), the second harmonic of azimuthal particle distribution, has been measured with PHENIX detector in Au+Au collisions at sqrt[s(NN)]=200 GeV for identified and inclusive charged production central rapidities (|eta|<0.35) respect to reaction plane defined high (|eta|=3-4 ). We observe that v(2) mesons falls below (anti)baryons p(T)>2 GeV/c, marked contrast predictions a hydrodynamical model. A quark-coalescence model is also investigated.
The PHENIX experiment at RHIC has measured charged hadron yields mid-rapidity over a wide range of transverse momentum (0.5 < p_T 10 GeV/c) in Au+Au collisions sqrt(s_NN)=200 GeV. data are compared to pi^zero measurements from the same experiment. For both hadrons and neutral pions, per nucleon-nucleon collision significantly suppressed central peripheral collisions. suppression sets gradually increases with increasing centrality Above 4-5 GeV/c p_T, constant almost identical pi^zeroes is...
Identified ${\ensuremath{\pi}}^{+/\ensuremath{-}}$, ${K}^{+/\ensuremath{-}}$, $p$, and $\overline{p}$ transverse momentum spectra at midrapidity in $\sqrt{{s}_{\mathrm{NN}}}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}130\phantom{\rule{0ex}{0ex}}\mathrm{GeV}\phantom{\rule{0ex}{0ex}}\mathrm{Au}+\mathrm{Au}$ collisions were measured by the PHENIX experiment RHIC as a function of collision centrality. Average momenta increase with number participating nucleons similar way for all particle...
The first measurement of direct photons in Au + collisions at (square root)S(NN) = 200 GeV is presented. photon signal extracted as a function the collision centrality and compared to next-to-leading order perturbative quantum chromodynamics calculations. yield shown scale with number nucleon-nucleon for all centralities.
The dependence of transverse momentum spectra neutral pions and $\ensuremath{\eta}$ mesons with ${p}_{T}<16\text{ }\text{ }\mathrm{GeV}/c$ ${p}_{T}<12\text{ }\mathrm{GeV}/c$, respectively, on the centrality collision has been measured at midrapidity by PHENIX experiment BNL Relativistic Heavy Ion Collider (RHIC) in $d+\mathrm{Au}$ collisions $\sqrt{{s}_{NN}}=200\text{ }\mathrm{GeV}$. yields are compared to those $p+p$ same $\sqrt{{s}_{NN}}$ scaled number underlying nucleon-nucleon...
Transverse momentum spectra of electrons from Au+Au collisions at square root[s(NN)] = 130 GeV have been measured midrapidity by the PHENIX experiment Relativistic Heavy Ion Collider. The show an excess above background photon conversions and light hadron decays. electron signal is consistent with that expected semileptonic decays charm. yield dN(e)/dy for p(T) > 0.8 GeV/c 0.025+/-0.004(stat)+/-0.010(syst) in central collisions, corresponding charm cross section 380+/-60(stat)+/-200(syst)...
We present results for the charged-particle multiplicity distribution at mid-rapidity in Au - collisions sqrt(s_NN)=130 GeV measured with PHENIX detector RHIC. For 5% most central we find $dN_{ch}/d\eta_{|\eta=0} = 622 \pm 1 (stat) 41 (syst)$. The results, analyzed as a function of centrality, show steady rise particle density per participating nucleon centrality.
Additional evidence for the rare kaon decay K+-->pi+nu(nu) has been found in a new data set with comparable sensitivity to previously reported result. One event was observed pion momentum region examined, 211<P<229 MeV/c, bringing total combined two. Including all taken, backgrounds were estimated contribute 0.15+/-0.05 events. The branching ratio is B(K+-->pi+nu(nu)) = 1.57(+1.75)(-0.82)x10(-10).
Measurements of neutral pion (π0) production at midrapidity in √sNN=200 GeV Au+Au collisions as a function transverse momentum, pT, collision centrality, and angle with respect to reaction plane are presented. The data represent the final π0 results from PHENIX experiment for first RHIC run design center-of-mass energy. They include additional obtained using Level-2 trigger more than factor 3 increase statistics over previously published pT>6 GeV/c. We evaluate suppression yield high-pT π0's...
An event consistent with the signature expected for rare kaon decay ${K}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}\ensuremath{\nu}\overline{\ensuremath{\nu}}$ has been observed. In pion momentum region examined, $211<P<230\mathrm{MeV}/c$, backgrounds are estimated to contribute $0.08\ifmmode\pm\else\textpm\fi{}0.03$ events. If is due ${K}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}\ensuremath{\nu}\overline{\ensuremath{\nu}}$, branching ratio...
Inclusive transverse momentum spectra of \ensuremath{\eta} mesons in the range ${p}_{T}\ensuremath{\approx}2$--12 GeV/$c$ have been measured at midrapidity ($|\ensuremath{\eta}|<0.35$) by PHENIX experiment RHIC $p+p,d$+Au, and Au+Au collisions $\sqrt{{s}_{\mathit{NN}}}=200$ GeV. The are reconstructed through their $\ensuremath{\eta}\ensuremath{\rightarrow}\ensuremath{\gamma} \ensuremath{\gamma}$ channel for three colliding systems as well...
Experiment E949 at Brookhaven National Laboratory studied the rare decay \$K^+\to\pi^+\nu\bar{\nu}$ and other processes with an exposure of $1.77\times 10^{12}$ $K^+$'s. The data were analyzed using a blind analysis technique yielding one candidate event estimated background $0.30\pm0.03$ events. Combining this result observation two events by predecessor experiment E787 gave branching ratio ${\calB}(K^+\to\pi^+\nu\bar{\nu})=(1.47^{+1.30}_{-0.89})\times 10^{-10}$, consistent Standard Model...
The properties of jets produced in $p+p$ collisions at $\sqrt{s}=200\text{ }\text{ }\mathrm{GeV}$ are measured using the method two-particle correlations. trigger particle is a leading from large transverse momentum jet while associated comes either same or away-side jet. Analysis angular width near-side peak correlation function determines jet-fragmentation ${j}_{\mathrm{T}}$. extracted value,...
A comprehensive survey of event-by-event fluctuations charged hadron multiplicity in relativistic heavy ions is presented. The covers Au+Au collisions at sqrt(s_NN) = 62.4 and 200 GeV, Cu+Cu 22.5, 62.4, GeV. Fluctuations are measured as a function collision centrality, transverse momentum range, charge sign. After correcting for non-dynamical due to the geometry within centrality bin, remaining dynamical expressed variance normalized by mean tend decrease with increasing centrality....
Direct photons have been measured in sqrt(s_NN)=200 GeV d+Au collisions at midrapidity. A wide p_T range is covered by measurements of nearly-real virtual (1<p_T<6 GeV/c) and real (5<p_T<16 GeV/c). The invariant yield the direct over scaled p+p cross section consistent with unity. Theoretical calculations assuming standard cold nuclear matter effects describe data well for entire range. This indicates that large enhancement observed Au+Au 1.0<p_T<2.5 GeV/c due to a source other than...
We consider the XXZ spin chain in scaling limit Matsubara direction. The main result of this paper is new representations for functions $\Psi(l, \kappa)$ and $\Theta(l, m; \kappa, \alpha)$ associated with function $\omega(\zeta, \xi; found expression correlation generators fermionic basis chain. final incorporates case particle-hole excitations which needed relation to Virasoro CFT descendants.
We report the results of a search for decay ${K}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}\ensuremath{\nu}\overline{\ensuremath{\nu}}$ in kinematic region with ${\ensuremath{\pi}}^{+}$ momentum $140<P<195\mathrm{MeV}/c$ using data collected by E787 experiment at BNL. No events were observed. When combined our previous this region, one candidate event an expected background $1.22\ifmmode\pm\else\textpm\fi{}0.24$ 90% C.L. upper limit...
The PHENIX experiment at RHIC has measured transverse energy and charged particle multiplicity mid-rapidity in Au+Au collisions sqrt(s_NN) = 19.6, 130 200 GeV as a function of centrality. presented results are compared to measurements from other experiments, experiments lower energies. dependence dE_T/deta dN_ch/deta per pair participants is consistent with logarithmic scaling for the most central events. centrality similar all incident At energies ratio was found independent growing slowly...
A search for additional evidence the rare kaon decay K+-->pi(+)nunu; has been made with a new data set comparable in sensitivity to previous exposure that produced single event. No events were found pion momentum region examined, 211<P<229 MeV/c. Including reanalysis of original set, backgrounds estimated contribute 0.08+/-0.02 events. Based on one observed event, branching ratio is B(K+-->pi(+)nunu;) = 1.5(+3.4)(-1.2)x10(-10).
The transverse momentum dependence of the azimuthal anisotropy parameter v2, second harmonic distribution, for electrons at midrapidity (|η|<0.35) has been measured with PHENIX detector in Au+Au collisions sNN=200 GeV. measurement was made respect to reaction plane defined high rapidities (|η|=3.1−3.9). From result we have v2 from heavy flavor decay after subtraction other sources such as photon conversions and Dalitz light neutral mesons. We observe a nonzero single electron 90% confidence...
J/psi production has been measured in proton-proton collisions at square root of s=200 GeV over a wide rapidity and transverse momentum range by the PHENIX experiment Relativistic Heavy Ion Collider. Distributions momentum, along with measurements mean total cross section are presented compared to available theoretical calculations. The is 4.0+/-0.6(stat)+/-0.6(syst)+/-0.4(abs) mu b. 1.80+/-0.23(stat)+/-0.16(syst) GeV/c.
We present azimuthal angle correlations of intermediate transverse momentum () hadrons from dijets in and collisions at 200 GeV. The away-side dijet induced correlation is broadened, non-Gaussian, peaked away central semicentral all the systems. broadening peak location are found to depend upon number participants collision, but not on collision energy or beam nuclei. These results consistent with sound shock wave models, pose challenges Cherenkov gluon radiation models.
New measurements are presented for charged hadron azimuthal correlations at midrapidity in Au+Au collisions (square root)s(NN) = 62.4 and 200 GeV. They compared to earlier obtained 130 GeV Pb + 17.2 Sizeable anisotropies observed with centrality transverse momentum (pT) dependence characteristic of elliptic flow (upsilon2). For a broad range centralities, the magnitudes trends differential anisotropy, upsilon2(pT), change very little over collision energy 62-200 GeV, indicating saturation...
The invariant differential cross section for inclusive electron production in $p+p$ collisions at $\sqrt{s}=200\text{ }\text{ }\mathrm{GeV}$ has been measured by the PHENIX experiment BNL Relativistic Heavy Ion Collider over transverse momentum range $0.4\ensuremath{\le}{p}_{T}\ensuremath{\le}5.0\text{ }\mathrm{GeV}/c$ central rapidity region ($|\ensuremath{\eta}|\ensuremath{\le}0.35$). contribution to spectrum from semileptonic decays of hadrons carrying heavy flavor, i.e., charm quarks or,...
A measurement of direct photons in $p+p$ collisions at $\sqrt{s}=200\text{ }\text{ }\mathrm{GeV}$ is presented. photon excess above background from ${\ensuremath{\pi}}^{0}\ensuremath{\rightarrow}\ensuremath{\gamma}+\ensuremath{\gamma}$, $\ensuremath{\eta}\ensuremath{\rightarrow}\ensuremath{\gamma}+\ensuremath{\gamma}$ and other decays observed the transverse momentum range $5.5<{p}_{\mathrm{T}}<7\text{ }\mathrm{GeV}/c$. The result compared to a next-to-leading-order perturbative QCD...