We present measurements of the charge balance function, from the charged particles, for diverse pseudorapidity and transverse momentum ranges in Au + Au collisions at 200 GeV using the STAR detector ...at RHIC. We observe that the balance function is boost-invariant within the pseudorapidity coverage -1.3, 1.3. The balance function properly scaled by the width of the observed pseudorapidity window does not depend on the position or size of the pseudorapidity window. This scaling property also holds for particles in different transverse momentum ranges. In addition, we find that the width of the balance function decreases monotonically with increasing transverse momentum for all centrality classes.
The COmpact detectoR for the Eic (CORE) Proposal was submitted to the EIC "Call for Collaboration Proposals for Detectors". CORE comprehensively covers the physics scope of the EIC Community White ...Paper and the National Academies of Science 2018 report. The design exploits advances in detector precision and granularity to minimize size. The central detector includes a 3Tesla, 2.5m solenoid. Tracking is primarily silicon. Electromagnetic calorimetry is based on the high performance crystals. Ring-imaging Cherenkov detectors provide hadronic particle identification.
The Heavy Photon Search experiment (HPS) at the Thomas Jefferson National
Accelerator Facility searches for electro-produced dark photons. We report
results from the 2016 Engineering Run consisting ...of 10608/nb of data for both
the prompt and displaced vertex searches. A search for a prompt resonance in
the $e^+e^-$ invariant mass distribution between 39 and 179 MeV showed no
evidence of dark photons above the large QED background, limiting the coupling
of {\epsilon}^2 {\geq} 10^-5, in agreement with previous searches. The search
for displaced vertices showed no evidence of excess signal over background in
the masses between 60 and 150 MeV, but had insufficient luminosity to limit
canonical heavy photon production. This is the first displaced vertex search
result published by HPS. HPS has taken high-luminosity data runs in 2019 and
2021 that will explore new dark photon phase space.
Phys.Lett.B632:167-172,2006 We report on the first measurement of the single spin analyzing power (A_N)
at sqrt(s)=200GeV, obtained by the pp2pp experiment using polarized proton
beams at the ...Relativistic Heavy Ion Collider (RHIC). Data points were measured
in the four momentum transfer t range 0.01 < |t| < 0.03 (GeV/c)^2. Our result,
averaged over the whole t-interval is about one standard deviation above the
calculation, which uses interference between electromagnetic spin-flip
amplitude and hadronic non-flip amplitude, the source of A_N. The difference
could be explained by an additional contribution of a hadronic spin-flip
amplitude to A_N.
ATHENA has been designed as a general purpose detector capable of delivering the full scientific scope of the Electron-Ion Collider. Careful technology choices provide fine tracking and momentum ...resolution, high performance electromagnetic and hadronic calorimetry, hadron identification over a wide kinematic range, and near-complete hermeticity. This article describes the detector design and its expected performance in the most relevant physics channels. It includes an evaluation of detector technology choices, the technical challenges to realizing the detector and the R&D required to meet those challenges.
Phys.Lett.B579:245-250,2004 The first result of the pp2pp experiment at RHIC on elastic scattering of
polarized protons at sqrt{s} = 200 GeV is reported here. The exponential slope
parameter b of the ...diffractive peak of the elastic cross section in the t range
0.010 <= |t| <= 0.019 (GeV/c)^2 was measured to be b = 16.3 +- 1.6 (stat.) +-
0.9 (syst.) (GeV/c)^{-2} .
Achillessehnenschaden Hempfling, H.; Meyer-Clement, M.; Bultmann, S. ...
Trauma und Berufskrankheit,
06/2016, Letnik:
18, Številka:
2
Journal Article
Recenzirano
Zusammenfassung
Bei der Entstehung einer Zusammenhangstrennung bzw. Dehiszenz einer Achillessehne sind neben den herkömmlichen medizinischen Überlegungen auch Grundsätze der Physik zu beachten. Für ...die naturwissenschaftliche und rechtliche Bewertung der Kausalität im Bereich der gesetzlichen Unfallversicherung können zusätzlich histopathologische Feststellungen von erheblicher Bedeutung sein. Die Achillessehne ist Teil eines Muskel-Sehnen-Knochen-Komplexes und kann durch direkte und indirekte Kräfte geschädigt werden. Das Ausmaß des Schadens hängt von der Art der von außen einwirkenden Kräfte ab, aber insbesondere auch vom Zustand der Sehne selbst.
Although the proton was discovered about 100 years ago, its spin structure still remains a mystery. Recent studies suggest that the orbital angular momentum of sea quarks could significantly ...contribute to the proton's spin. The SeaQuest experiment, which recently completed data collection, probed the unpolarized light quark sea distributions of the proton using the Drell-Yan process. Its successor, the SpinQuest (E1039), will access the \(\bar{u}\) and \(\bar{d}\) Sivers functions using polarized NH\(_3\) and ND\(_3\) targets. A non-zero Sivers asymmetry, observed in SpinQuest, would be a strong indication of non-zero sea-quark orbital angular momentum. The SpinQuest experiment can also probe the sea quark's transversity distribution, which is relevant for the determination of proton's tensor charge. Recent study suggests that sea-quarks might contribute significantly to deuteron's tensor polarized structure functions. This can be further probed in SpinQuest using tensor polarized ND\(_3\) target. The current status and future plan of the experiment are presented.
The Heavy Photon Search experiment (HPS) at the Thomas Jefferson National Accelerator Facility searches for electro-produced dark photons. We report results from the 2016 Engineering Run consisting ...of 10608/nb of data for both the prompt and displaced vertex searches. A search for a prompt resonance in the \(e^+e^-\) invariant mass distribution between 39 and 179 MeV showed no evidence of dark photons above the large QED background, limiting the coupling of {\epsilon}^2 {\geq} 10^-5, in agreement with previous searches. The search for displaced vertices showed no evidence of excess signal over background in the masses between 60 and 150 MeV, but had insufficient luminosity to limit canonical heavy photon production. This is the first displaced vertex search result published by HPS. HPS has taken high-luminosity data runs in 2019 and 2021 that will explore new dark photon phase space.
A new Radial Time Projection Chamber (RTPC) was developed at the Jefferson
Laboratory to track low-energy nuclear recoils for the purpose of measuring
exclusive nuclear reactions, such as coherent ...Deeply Virtual Compton Scattering
and coherent meson production off $^4$He. In such processes, the $^4$He nucleus
remains intact in the final state, however the CEBAF Large Acceptance
Spectrometer (CLAS) cannot track the low energy $\alpha$ particles. In 2009, we
carried out measurements using the CLAS spectrometer supplemented by the RTPC
positioned directly around a gaseous $^4$He target, allowing a detection
threshold as low as 12$\sim$MeV for $^4$He. This article discusses the design,
principle of operation, calibration methods and the performances of this RTPC.
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