Cosmic‐Ray Antiproton Flux in the Energy Range from 200 to 600 MeV

Моисеев, А. А.; Yoshimura, K.; Ueda, I.; Anraku, K.; Golden, R. L.; Imori, M.; Inaba, S.; Kimbell, B.; Kimura, N.; Makida, Y.; Matsumoto, H.; Matsunaga, H.; Mitchell, J. W.; Motoki, M.; Nishimura, Jun; Nozaki, M.; Orito, S.; Ormes, J. F.; Saeki, T.; Seo, E. S.; Stochaj, S. J.; Streitmatter, R. E.; Suzuki, Jun–ichi; Tanaka, Kenichi; Yajima, N.; Yamagami, T.; Yamamoto, A.; Yoshida, Tetsuya

doi:10.1086/303463

Cited by 75 publications

(27 citation statements)

References 30 publications

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“…A uniquely capable and cost-effective multipurpose experiment could be mounted by adding a magnetic spectrometer to the existing Fermilab E760 lead-glass calorimeter [1079] using an available BESS solenoid [1080], fine-pitch scintillating fibers (SciFi), the DØ SciFi readout system [1081], and hadron ID via fast timing [1082]. If the relevant cross sections are as large as expected, this apparatus could produce world-leading measurements of X(3872) properties, along with those of other charmonium and nearby states, as is now proposed 23 to Fermilab [1083,1084].…”

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

103

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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.

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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

103

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“…Antiproton spectra have been measured by BESS (Balloon-borne Experiment with a Superconducting Spectrometer) in a series of flights from Lynn Lake, Canada providing reasonable statistics above 1 GeV [1,2,3,4,5,6,7]. Below 1 GeV statistics are limited and the effects of solar modulation are greater.…”

Section: Introductionmentioning

confidence: 99%

Measurement of the cosmic-ray low-energy antiproton spectrum with the first BESS-Polar Antarctic flight

et al. 2008

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The BESS-Polar spectrometer had its first successful balloon flight over Antarctica in December 2004. During the 8.5-day long-duration flight, almost 0.9 billion events were recorded and 1,520 antiprotons were detected in the energy range 0.1-4.2 GeV. In this paper, we report the antiproton spectrum obtained, discuss the origin of cosmic-ray antiprotons, and use antiproton data to probe the effect of charge-signdependent drift in the solar modulation.

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“…10). The payload floated for 29.5 days on circulating air stream over Antarctica at an altitude of 2009) ~36km, which corresponds to an atmospheric depth around 5~6 g/cm 2 . The magnetic cutoff rigidity was 0.5GV at most, ~0.2GV in average, which was lower than stopping energy in the spectrometer.…”

Section: Scientific Flightmentioning

confidence: 99%

“…The Baloon-borne Experiment with a Superconducting Spectrometer, BESS, has measured the flux of cosmic-ray anti-protons in an energy range of 0.18 to 4.2 GeV [1][2][3][4][5][6] , and observed a characteristic peak around at 2 GeV in the energy spectrum. This shows that the observed cosmic ray antiprotons are predominantly produced by collisions of primary cosmic rays with interstellar gas.…”

Section: Introductionmentioning

confidence: 99%

The 2007 BESS-Polar Scientific Flight in Antarctica

Hasegawa

Horikoshi

Matsuda

et al. 2009

Trans. JSASS Space Tech. Japan

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The Balloon-born Experiment with a Superconducting Spectrometer (BESS), aiming to search for antiparticles/antimatter in the cosmic radiation, successfully carried out the second scientific flight over Antarctica in 2007/2008, in the solar minimum period. The newly developed BESS Polar-II spectrometer including the solar-cell power supply system worked well during the flight, and more than 4.6 billion cosmic ray events were recorded for 24.5 days. This report describes overview of the scientific flight.

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Cosmic‐Ray Antiproton Flux in the Energy Range from 200 to 600 MeV

Cited by 75 publications

References 30 publications

Heavy quarkonium: progress, puzzles, and opportunities

Heavy quarkonium: progress, puzzles, and opportunities

Measurement of the cosmic-ray low-energy antiproton spectrum with the first BESS-Polar Antarctic flight

The 2007 BESS-Polar Scientific Flight in Antarctica

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