Mon·Aug 31, 2015Monday·August 31, 2015

1. 01*

   Dibaryons at COSY

   M. Bashkanov🇩🇪 · H. Clement🇩🇪 · D. P. Watts🇬🇧

   Experiments at the Juelich Cooler Synchrotron (COSY) have now found compelling evidence for a new resonant state in the two-baryon system with mass 2380 MeV and a width of 70 MeV. The structure, containing six valence quarks, constitutes a so-called dibaryon, either a hexaquark or a hadronic molecule. The present knowledge about the dibaryon as well as other implications and possible future experiments are discussed.

   nucl-exJPS Conf.Proc.(2016)·6 citations
2. 02*

   Measurement of Lifetimes in 23Mg

   O. S. Kirsebom · P. Bender · A. Cheeseman · G. Christian · R. Churchman · D. S. Cross · B. Davids · L. J. Evitts · J. Fallis · N. Galinski · A. B. Garnsworthy · G. Hackman and 13 other authors

   Several lifetimes in 23Mg have been determined for the first time using the Doppler-shift attenuation method. A Monte Carlo simulation code has been written to model the gamma-ray line shape. An upper limit of 12 fs at the 95% C.L. has been obtained for the astrophysically important 7787 keV state.

   nucl-exPRC(2016)·8 citations
3. 03*

   The contribution of NLO and LPM corrections to thermal dilepton emission in heavy ion collisions

   Yannis Burnier🇨🇭 · Chiara Gastaldi🇨🇭

   Recently lots of efforts have been made to obtain the next to leading order and Landau-Pomeranchuk-Migdal corrections to the thermal dilepton emission rate in perturbative QCD. Here we apply these results to the plasma created in heavy ion collisions and see wether these corrections improve the comparison between theoretical calculations and experimental results for the invariant mass dependence of the dilepton emission rate. In particular, we simulate the quark-gluon plasma produced at RHIC and LHC using a 2+1-dimensional viscous hydro model. We compare our results to STAR experiment and comment on the need for a non-perturbative determination of the dilepton rate at low invariant mass.

   ↳ nucl-thhep-phnucl-exPRC(2016)·12 citations
4. 04*

   Interplay between antimagnetic and collective rotation in Fe-58

   J. Peng · P. W. Zhao🇺🇸 · S. Q. Zhang🇨🇳 · J. Meng🇨🇳

   The self-consistent tilted axis cranking covariant density functional theory based on the point- coupling interaction PC-PK1 is applied to investigate the possible existence of antimagnetic ro- tation in the nucleus Fe-58. The observed data for Band 3 and Band 4 are reproduced well with two assigned configurations. It is found that both bands correspond to a rotation of antimagnetic character, but, due to the presence of considerable deformation, the interplay between antimag- netic rotation and collective motion plays an essential role. In particular for Band 4, collective rotation is dominant in the competition with antimagnetic rotation. Moreover, it is shown that the behavior of the ratios between the dynamic moments of inertia and the B(E2) values reflects the interplay between antimagnetic and collective rotation.

   ↳ nucl-thnucl-exIJMPE(2017)·7 citations
5. 05*

   Performance of a Large-area GEM Detector Read Out with Wide Radial Zigzag Strips

   Aiwu Zhang🇺🇸 · Vallary Bhopatkar🇺🇸 · Eric Hansen🇺🇸 · Marcus Hohlmann🇺🇸 · Shreeya Khanal🇺🇸 · Michael Phipps🇺🇸 · Elizabeth Starling🇺🇸 · Jessie Twigger🇺🇸 · Kimberly Walton🇺🇸

   A 1-meter-long trapezoidal Triple-GEM detector with wide readout strips was tested in hadron beams at the Fermilab Test Beam Facility in October 2013. The readout strips have a special zigzag geometry and run along the radial direction with an azimuthal pitch of 1.37 mrad to measure the azimuthal phi-coordinate of incident particles. The zigzag geometry of the readout reduces the required number of electronic channels by a factor of three compared to conventional straight readout strips while preserving good angular resolution. The average crosstalk between zigzag strips is measured to be an acceptable 5.5%. The detection efficiency of the detector is (98.4+-0.2)%. When the non-linearity of the zigzag-strip response is corrected with track information, the angular resolution is measured to be (193+-3) urad, which corresponds to 14% of the angular strip pitch. Multiple Coulomb scattering effects are fully taken into account in the data analysis with the help of a stand-alone Geant4 simulation that estimates interpolated track errors.

   ↳ physics.ins-dethep-exnucl-exNucl.Instrum.Meth.A(2016)·8 citations
6. 06*

   New physics effects on neutrinoless double beta decay from right-handed current

   Shao-Feng Ge🇩🇪 · Manfred Lindner🇩🇪 · Sudhanwa Patra🇮🇳

   We study the impact of new physics contributions to neutrinoless double beta decay arising from right-handed current in comparison with the standard mechanism. If the light neutrinos obtain their masses from Type-II seesaw within left-right symmetric model, where the Type-I contribution is suppressed to negligible extent, the right-handed PMNS matrix is the same as its left-handed counterpart, making it highly predictable and can be tested at next-generation experiments. It is very attractive, especially with recent cosmological constraint favoring the normal hierarchy under which the neutrinoless double beta decay is too small to be observed unless new physics appears as indicated by the recent diboson excess observed at ATLAS. The relative contributions from left- and right-handed currents can be reconstructed with the ratio between lifetimes of two different isotopes as well as the ratio of nuclear matrix elements. In this way, the theoretical uncertainties in the calculation of nuclear matrix elements can be essentially avoided. We also discuss the interplay of neutrinoless double beta decay measurements with cosmology, beta decay, and neutrino oscillation.

   ↳ hep-phhep-exnucl-exnucl-thJHEP(2015)·51 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.