Author
C. Kiesling
Bio: C. Kiesling is an academic researcher from Stanford University. The author has contributed to research in topics: Computer Automated Measurement and Control & Data acquisition. The author has an hindex of 3, co-authored 4 publications receiving 92 citations.
Papers
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TL;DR: In this paper, the authors investigated the four-photon final state produced in γγ colissions and gave an upper bound for f ≈ ηη. But this upper bound was only for the π 0 η channel.
40 citations
TL;DR: In this article, the decay of a photon into two photons was studied and the branching ratio was found to be 2.7-3.0-GeV in the case of the 2.83-approximation.
Abstract: The decay $\frac{J}{\ensuremath{\psi}}$ into $3\ensuremath{\gamma}$ final states has been studied. No evidence is found for the existence of the $X(2.83)$ or any heavy narrow state (e.g., the ${\ensuremath{\eta}}_{c}$) decaying into two photons. Upper limits are given on the branching ratio $\frac{J}{\ensuremath{\psi}}\ensuremath{\rightarrow}{\ensuremath{\eta}}_{c}$, ${\ensuremath{\eta}}_{c}\ensuremath{\rightarrow}2\ensuremath{\gamma}$ for ${\ensuremath{\eta}}_{c}$ masses in the 2.7-3.0-GeV region. In addition, the branching ratios $\frac{J}{\ensuremath{\psi}\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\eta}}$, $\ensuremath{\gamma}{\ensuremath{\eta}}^{\ensuremath{'}}$ are measured. It is found that the ${\ensuremath{\eta}}^{\ensuremath{'}}$ branching ratio is higher than previously reported.
29 citations
TL;DR: The Cluster of 54 detector as mentioned in this paper is the predecessor of the Crystal Ball detector, which is designed for the study of electron-positron collisions at colliding beam facilities, and it has been successfully tested.
Abstract: A prototye NaI(Tl) detector (the Cluster of 54) of spherical geometry subtending a solid angle of 7.5% of 4? at its center, has recently been assembled and tested. This detector consisted of 54 close-packed but optically isolated NaI(Tl) modules and the associated electronic circuitry. The Cluster of 54 is the predecessor of an almost complete spherical detector, the Crystal Ball, which will cover 94% of 4?. The latter detector is now under construction and is especially designed for the study of ?-rays produced in electron-positron collisions at colliding beam facilities. This article will outline the mechanical, optical, and electronic assembly of the prototype system. Cluster of 54 test data will be presented.
21 citations
TL;DR: The data acquisition system for the Crystal Ball project at SLAC is described in this article, where a PDP-11/t55 using RSX-11M connected to the SLAC Triplex is the basis of the system.
Abstract: The data acquisition system for the Crystal Ball project at SLAC is described. A PDP-11/t55 using RSX-11M connected to the SLAC Triplex is the basis of the system. A "physics pipeline" allows physicists to write their own equipment-monitoring or physics tasks which require event sampling. As well, an interactive analysis package (MULTI) is in the pipeline. Histogram collection and display on the PDP are implemented using the Triplex histogramming package. Various interactive event displays are also implemented.
2 citations
Cited by
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Technische Universität München1, Novosibirsk State University2, Cornell University3, Lawrence Livermore National Laboratory4, University of California, Davis5, Argonne National Laboratory6, Fermilab7, Florida State University8, Indiana University9, Brookhaven National Laboratory10, Wayne State University11, University of Paris-Sud12, GSI Helmholtz Centre for Heavy Ion Research13, Ohio State University14, University of Regensburg15, University of Ferrara16, Polish Academy of Sciences17, University of Bari18, Max Planck Society19, Lancaster University20, Peking University21, Thomas Jefferson National Accelerator Facility22, University of Auvergne23, University of Cincinnati24, Stanford University25, University of Alberta26, Forschungszentrum Jülich27, University of Hawaii28, Illinois Institute of Technology29, Lawrence Berkeley National Laboratory30, École Polytechnique31, Budker Institute of Nuclear Physics32, CERN33, Université catholique de Louvain34, Pratt Institute35, University of São Paulo36, Seoul National University37, Tsinghua University38, Stony Brook University39, University of Valencia40, University of Milan41, Tohoku University42, University of Minnesota43
TL;DR: The early years of this period were chronicled in the Quarkonium Working Group (QWG) CERN Yellow Report (YR) in 2004, which presented a comprehensive review of the status of the field at that time and provided specific recommendations for further progress as mentioned in this paper.
Abstract: A golden age for heavy-quarkonium physics dawned a decade ago, initiated by the confluence of exciting advances in quantum chromodynamics (QCD) and an explosion of related experimental activity. The early years of this period were chronicled in the Quarkonium Working Group (QWG) CERN Yellow Report (YR) in 2004, which presented a comprehensive review of the status of the field at that time and provided specific recommendations for further progress. However, the broad spectrum of subsequent breakthroughs, surprises, and continuing puzzles could only be partially anticipated. Since the release of the YR, the BESII program concluded only to give birth to BESIII; the B-factories and CLEO-c flourished; quarkonium production and polarization measurements at HERA and the Tevatron matured; and heavy-ion collisions at RHIC have opened a window on the deconfinement regime. All these experiments leave legacies of quality, precision, and unsolved mysteries for quarkonium physics, and therefore beg for continuing investigations at BESIII, the LHC, RHIC, FAIR, the Super Flavor and/or Tau-Charm factories, JLab, the ILC, and beyond. The list of newly found conventional states expanded to include h(c)(1P), chi(c2)(2P), B-c(+), and eta(b)(1S). In addition, the unexpected and still-fascinating X(3872) has been joined by more than a dozen other charmonium- and bottomonium-like "XYZ" states that appear to lie outside the quark model. Many of these still need experimental confirmation. The plethora of new states unleashed a flood of theoretical investigations into new forms of matter such as quark-gluon hybrids, mesonic molecules, and tetraquarks. Measurements of the spectroscopy, decays, production, and in-medium behavior of c (c) over bar, b (b) over bar, and b (c) over bar bound states have been shown to validate some theoretical approaches to QCD and highlight lack of quantitative success for others. Lattice QCD has grown from a tool with computational possibilities to an industrial-strength effort now dependent more on insight and innovation than pure computational power. New effective field theories for the description of quarkonium in different regimes have been developed and brought to a high degree of sophistication, thus enabling precise and solid theoretical predictions. Many expected decays and transitions have either been measured with precision or for the first time, but the confusing patterns of decays, both above and below open-flavor thresholds, endure and have deepened. The intriguing details of quarkonium suppression in heavy-ion collisions that have emerged from RHIC have elevated the importance of separating hot- and cold-nuclear-matter effects in quark-gluon plasma studies. This review systematically addresses all these matters and concludes by prioritizing directions for ongoing and future efforts.
1,354 citations
TL;DR: In this paper, the mass scale intrinsic to the resonance structures in different channels is not universal; a large mass scale is discovered, for instance, in the 0 −, 0 + gluonic channels.
512 citations
TL;DR: In this article, the effective lagrangian for the U(1) problem is reanalysed on the basis of the color gauge invariance of the underlying QCD, and the decoupling mechanism of the axial-vector ghost from the physical sector is investigated with a particular gauge-fixing condition.
229 citations
TL;DR: The complete results of the experiments carried out with the neutral detector at the e + e − storage ring VEPP-2M in the energy range 2 E = 0.5 − 1.4 GeV are reviewed in this article.
164 citations
Columbia University1, University of California, Berkeley2, University of Oklahoma3, University of Chicago4, Harvard University5, Brookhaven National Laboratory6, Fermilab7, California Institute of Technology8, University of Illinois at Urbana–Champaign9, CERN10, Stanford University11, University of California, Santa Cruz12, University of Pennsylvania13, Carleton University14, University of Florida15, University of Geneva16
TL;DR: A new high-statistics measurement of the cross section for the process and general agreement is found with unitarized models of the {gamma}{gamma}r arrow}{pi}{sup +}{pi},sup {minus}} reaction that include final-state interactions.
Abstract: We present a new high-statistics measurement of the cross section for the process {ital e}{sup +}{ital e}{sup {minus}}{r arrow}{ital e}{sup +}{ital e}{sup {minus}}{pi}{sup +}{pi}{sup {minus}} at a center-of-mass energy of 29 GeV for invariant pion-pair masses {ital M}({pi}{sup +}{pi}{sup {minus}}) between 350 MeV/{ital c}{sup 2} and 1.6 GeV/{ital c}{sup 2}. We observe the {ital f}{sub 2}(1270) and measure its radiative width to be 3.15{plus minus}0.04{plus minus}0.39 keV. We also observe an enhancement in the {pi}{sup +}{pi}{sup {minus}} spectrum near 1 GeV. General agreement is found with unitarized models of the {gamma}{gamma}{r arrow}{pi}{sup +}{pi}{sup {minus}} reaction that include final-state interactions.
161 citations