Experiment E835 at Fermilab

Garzoglio, Gabriele; Gollwitzer, K.; Hahn, A.; Hu, M.; Marsh, P.; Peoples, J.; Pordes, S.; Streets, J.; Werkema, S.; Ambrogiani, M.; Andreotti, M.; Baldini, W.; Bonsi, Davide; Bombonati, M.; Bettoni, D.; Calabrese, R.; Cibinetto, G.; Dalpiaz, P. F.; Luppi, E.; Martini, M.; Negrini, M.; Savrié, M.; Stancari, G.; Tomassetti, L.; Buzzo, A.; Vetere, M. Lo; Macrı́, M.; Marinelli, M.; Pallavicini, M.; Patrignani, C.; Robutti, E.; Santroni, A.; Lasio, G.; Mandelkern, M.; Roethel, W.; Schultz, J.; Zioulas, G.; Graham, M. T.; Rusack, R.; Seo, S. h.; Vidnovic, T.; Fan, X.; Jin, S.; Joffe, D.; Kasper, J.; Maas, P.; Metreveli, Z.; Pedlar, T. K.; Rosen, J.; Rumerio, P.; Seth, K. K.; Tomaradze, A.; Uman, I.; Zweber, P.; Argirò, S.; Bagnasco, S.; Borreani, G.; Cester, R.; Marchetto, F.; Menichetti, E.; Mussa, R.; Obertino, M. M.; Pastrone, N.

doi:10.1016/j.nima.2003.10.089

Cited by 30 publications

(31 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Antiproton Accumulator experiments E760 and E835 made the world's most precise ( < ∼ 100 keV) measurements of charmonium masses and widths [1085,1086], thanks to the precisely known collision energy of the stochastically cooledp beam (with its ≈ 0.02% energy spread) with a hydrogen cluster-jet target [1087]. Significant charmonium-related questions remain, most notably the nature of the mysterious X(3872) state [32] and improved measurements of the h c (1P ) and η c (2S) [1].…”

Section: Proposedpp Project At Fermilabmentioning

confidence: 99%

Heavy quarkonium: progress, puzzles, and opportunities

Brambilla¹,

Eidelman²,

Heltsley³

et al. 2011

Advances in the Physics of Particles and Nuclei

Self Cite

103

View full text Add to dashboard Cite

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 hc(1P ), χc2(2P ), B + c , and η b (1S). In addition, the unexpected and still-fascinating X(3872) has been joined by * Editors † Section coordinators ‡ Corresponding author: bkh2@cornell.edu more than a dozen other charmonium-and bottomonium-like "XY Z" 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 cc, bb, and bc 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 industrialstrength 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 hotand 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.

show abstract

Section: Proposedpp Project At Fermilabmentioning

confidence: 99%

Heavy quarkonium: progress, puzzles, and opportunities

Brambilla¹,

Eidelman²,

Heltsley³

et al. 2011

Advances in the Physics of Particles and Nuclei

Self Cite

103

View full text Add to dashboard Cite

show abstract

“…hydrogen cluster-jet [37]. This could be a cryogenic, frozen-hydrogen target (already under development, as discussed in Sec.…”

Section: Experimental Approachmentioning

confidence: 99%

“…For running at antiproton kinetic energies below 8 GeV, some time will also be required for deceleration. This is accomplished using an RF cavity operating at the second harmonic of the beam revolution frequency, with a maximum RF voltage of about 3 kV, allowing a deceleration rate of about 20 MeV/s [37]. 12 Depending upon the desired beam energy, we expect the useful beam lifetime to be 10-20 hours.…”

Section: Beammentioning

confidence: 99%

See 1 more Smart Citation

Intensity-Frontier Antiproton Physics with The Antiproton Annihilation Spectrometer (TAPAS) at Fermilab

Apollinari¹,

Asner²,

Baldini³

et al. 2011

View full text Add to dashboard Cite

SummaryThe Fermilab Antiproton Source is the world's most intense source of antimatter. With the Tevatron program now behind us, this unique facility can help make the case for Fermilab's continued accelerator operations. The Antiproton Source can be used for unique, dedicated antimatter studies, including medium-energy p-annihilation experiments.We propose to assemble a powerful, yet cost-effective, solenoidal magnetic spectrometer for antiproton-annihilation events, and to use it at the Fermilab Antiproton Accumulator to measure the charm production cross section, study rare hyperon decays, search for hyperon CP asymmetry, precisely measure the properties of several charmonium and nearby states, and make the first measurements of the Drell-Yan continuum in medium-energy antiproton annihilation. Should the charm production cross section be as large as some have proposed, we will also be able to measure D 0 -D 0 mixing with high precision and discover (or sensitively limit) charm CP violation. The observation of charm or hyperon CP violation would be evidence for physics beyond the Standard Model, with possible implications for the origin of the baryon asymmetry of the universe -the question of what happened to all the antimatter that must have been produced in the Big Bang.The experiment will be carried out by an international collaboration and will require some four years of running time. As possibly the sole hadron experiment in progress at Fermilab during that time, it will play an important role in maintaining a broad particle physics program at Fermilab and in the U.S. It will thus help us to continue attracting creative and capable young people into science and technology, and introducing them to the important technologies of accelerators, detectors, and data acquisition and analysiskey roles in society that accelerator-based particle physics has historically played.i

show abstract

“…The stored and cooled * Now at: Department of Physics, Southern Methodist University, Dallas,Texas 75275 antiprotons circulating in the Fermilab Antiproton Accumulator intersect a hydrogen cluster jet gas target, and the reaction products are detected in a detector system which surrounds the interaction region. Full details of the detector and its performance can be found elsewhere [4]. Photons are detected in the lead glass central detector in the angular range 10.6 o < θ < 70.0 o and 2π in φ, with an energy resolution of σE (E)…”

Section: Data and Event Selectionmentioning

confidence: 99%

Light quark resonances inp¯pannihilations at5.2 GeV/c

et al. 2006

Self Cite

View full text Add to dashboard Cite

Data from the Fermilab E835 experiment have been used to study the reactionpp → ηηπ 0 at 5.2 GeV /c. A sample of 22 million six photons events has been analyzed to construct the Dalitz plot containing ∼ 80k ηηπ 0 events. A partial wave analysis of the data has been done. Six fJ -states decaying into ηη and five aJ -states decaying into ηπ 0 are identified in the mass region ∼ 1.3 and 2.4 GeV , and their masses, widths and spins are determined by maximum likelihood analysis of the data. Two f0 states are identified with the popular candidates for the lightest scalar glueball, f0(1500) and f0(1710).

show abstract

Experiment E835 at Fermilab

Cited by 30 publications

References 27 publications

Heavy quarkonium: progress, puzzles, and opportunities

Heavy quarkonium: progress, puzzles, and opportunities

Intensity-Frontier Antiproton Physics with The Antiproton Annihilation Spectrometer (TAPAS) at Fermilab

Light quark resonances inp¯pannihilations at5.2 GeV/c

Contact Info

Product

Resources

About