Tue·Jul 19, 2016Tuesday·July 19, 2016

1. 01*

   Frequency Shifts Induced by Field Gradients in Muon $g-2$ Experiments

   N. Nouri🇺🇸 · M.A. Brown🇺🇸 · R. Golub🇺🇸 · B. Plaster🇺🇸

   Two prominent efforts aimed at probing beyond Standard Model physics, searches for a neutron electric dipole moment (EDM) and measurements of the muon $g-2$ anomalous magnetic moment, employ spin precession techniques. In the most recent neutron EDM experiment, frequency shifts induced by magnetic field gradients and $\mathbf{E}\times \mathbf{v}$ motional fields were a significant source of systematic error. We consider the possibility of a similar effect in the most recent muon $g-2$ experiment, and find that such an effect could potentially be as large as $\sim 1$ ppm fractional error, to be compared with the reported $\sim 0.5$ ppm error.

   nucl-exhep-exhep-ph1 citation
2. 02*

   First Model-Independent Measurement of the Spin Triplet $p\Lambda$ Scattering Length from Final State Interaction in the $\vec{p}p\to p{K}^{+}\Lambda$ Reaction

   COSY-TOF Collaboration: F. Hauenstein🇩🇪 · E. Borodina🇩🇪 · H. Clement🇩🇪 · E. Doroshkevich🇩🇪 · R. Dzhygadlo🇩🇪 · K. Ehrhardt🇩🇪 · W. Eyrich🇩🇪 · W. Gast🇩🇪 · A. Gillitzer🇩🇪 · D. Grzonka🇩🇪 · J. Haidenbauer🇩🇪 · C. Hanhart🇩🇪 and 14 other authors

   The $\vec{p}p\to p{K}^{+}\Lambda$ reaction has been measured with the COSY-TOF detector at a beam momentum of $2.7\mathrm{GeV}/c$. The polarized proton beam enables the measurement of the beam analyzing power by the asymmetry of the produced kaon ($A_N^K$). This observable allows the $p\Lambda$ spin triplet scattering length to be extracted for the first time model independently from the final-state interaction in the reaction. The obtained value is $a_t=(-2.55_{-1.39}^{+0.72}{}_{\text{stat.}}\pm 0.6_{\text{syst.}}\pm 0.3_{\text{theo.}})\mathrm{fm}$. This value is compatible with theoretical predictions and results from model-dependent analyses.

   nucl-exPRC(2017)·21 citations
3. 03*

   An experimental review on elliptic flow of strange and multi-strange hadrons in relativistic heavy ion collisions

   Shusu Shi🇨🇳

   Strange hadrons, especially multi-strange hadrons are good probes for the early partonic stage of heavy ion collisions due to their small hadronic cross sections. In this paper, I give a brief review on the elliptic flow measurements of strange and multi-strange hadrons in relativistic heavy ion collisions at Relativistic Heavy Ion Collider (RHIC) and Large Hadron Collider (LHC).

   nucl-exAdv.High Energy Phys.(2016)·8 citations
4. 04*

   Test the chiral magnetic effect with isobaric collisions

   Wei-Tian Deng🇨🇳 · Xu-Guang Huang🇨🇳 · Guo-Liang Ma🇨🇳 · Gang Wang🇺🇸

   The quark-gluon matter produced in relativistic heavy-ion collisions may contain local domains in which P and CP symmetries are not preserved. When coupled with an external magnetic field, such P- and CP-odd domains will generate electric currents along the magnetic field --- a phenomenon called the chiral magnetic effect (CME). Recently, the STAR Collaboration at RHIC and the ALICE Collaboration at the LHC released data of charge-dependent azimuthal-angle correlators with features consistent with the CME expectation. However, the experimental observable is contaminated with significant background contributions from elliptic-flow-driven effects, which makes the interpretation of the data ambiguous. In this Letter, we show that the collisions of isobaric nuclei, ${}_{44}^{96}$Ru + ${}_{44}^{96}$Ru and ${}_{40}^{96}$Zr + ${}_{40}^{96}$Zr, provide an ideal tool to disentangle the CME signal from the background effects. Our simulation demonstrates that the two collision types at $\sqrt{s_{\mathrm{NN}}}=200$ GeV have more than $10\%$ difference in the CME signal and less than $2\%$ difference in the elliptic-flow-driven backgrounds for the centrality range of $20-60\%$.

   ↳ nucl-thhep-phnucl-exPRC(2016)·121 citations
5. 05*

   The Aerogel Cherenkov Detector for the SHMS magnetic spectrometer in Hall C at Jefferson Lab

   T. Horn🇺🇸 · H. Mkrtchyan🇦🇲 · S. Ali🇺🇸 · A. Asaturyan🇦🇲 · M.A.P. Carmignotto🇺🇸 · A. Dittmann🇺🇸 · D. Dutta🇺🇸 · R. Ent🇺🇸 · N. Hlavin🇺🇸 · Y. Illieva🇺🇸 · A. Mkrtchyan🇦🇲 · P. Nadel-Turonski🇺🇸 and 7 other authors

   Hadronic reactions producing strange quarks such as exclusive or semi-inclusive kaon production, play an important role in studies of hadron structure and the dynamics that bind the most basic elements of nuclear physics. The small-angle capability of the new Super High Momentum Spectrometer (SHMS) in Hall C, coupled with its high momentum reach - up to the anticipated 11-GeV beam energy in Hall C - and coincidence capability with the well-understood High Momentum Spectrometer, will allow for probes of such hadron structure involving strangeness down to the smallest distance scales to date. To cleanly select the kaons, a threshold aerogel Cerenkov detector has been constructed for the SHMS. The detector consists of an aerogel tray followed by a diffusion box. Four trays for aerogel of nominal refractive indices of n=1.030, 1.020, 1.015 and 1.011 were constructed. The tray combination will allow for identification of kaons from 1 GeV/c up to 7.2 GeV/c, reaching 10^-2 proton and 10^-3 pion rejection, with kaon detection efficiency better than 95%. The diffusion box of the detector is equipped with 14 five-inch diameter photomultiplier tubes. Its interior walls are covered with Gore diffusive reflector, which is superior to the commonly used Millipore paper and improved the detector performance by 35%. The inner surface of the two aerogel trays with higher refractive index is covered with Millipore paper, however, those two trays with lower aerogel refractive index are again covered with Gore diffusive reflector for higher performance. The measured mean number of photoelectrons in saturation is ~12 for n=1.030, ~sim8 for n=1.020, ~10 for n=1.015, and ~5.5 for n=1.011. The design details, the results of component characterization, and initial performance tests and optimization of the detector are presented.

   ↳ physics.ins-detnucl-exNucl.Instrum.Meth.A(2017)·9 citations
6. 06*

   Rare correlated sequences detection with DSSSD detector in a real-time mode at the Dubna gas-filled recoil separator

   Yury Tsyganov🇷🇺 · Alexandr Polyakov🇷🇺

   Method of active correlations is a key one to suppress radically beam associated backgrounds in heavy ion induced complete fusion nuclear reactions. This property is enhanced significantly when applying DSSSD detector instead of position sensitive resistive strip detector. Example of application in the 240Pu+48Ca->114+3n reaction is presented. An edge effect between neighbor strips is considered too. The value of the mentioned effect is measured as 15.9 percents for ER-alpha correlation chains. C++ Builder GFS2016 program package for spectral analysis is presented. Calibration parameters (totally 352) were obtained from natYb+48Ca nuclear reaction. New ultra intense FLNR DC280 cyclotron that is expected to be put into operation in the nearest future is also discussed from the viewpoint of the described method developments.

   ↳ physics.ins-detnucl-ex0 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.