Fri·Oct 5, 2018Friday·October 5, 2018

1. 01*

   Precise branching ratio measurements in ${}^{19}$Ne beta decay and fundamental tests of the weak interaction

   B.M. Rebeiro🇿🇦 · S. Triambak🇿🇦 · P.Z. Mabika🇿🇦 · P. Finlay🇨🇦 · C.S. Sumithrarachchi🇨🇦 · G. Hackman🇨🇦 · G.C. Ball🇨🇦 · P.E. Garrett🇨🇦 · C.E. Svensson🇨🇦 · D.S. Cross🇨🇦 · R. Dunlop🇨🇦 · A.B. Garnsworthy🇨🇦 and 16 other authors

   We used the 8$\pi$ $\gamma$-ray spectrometer at the TRIUMF-ISAC radiocative ion beam facility to obtain high-precision branching ratios for ${}^{19}$Ne ${\beta }^{+}$ decay to excited states in ${}^{19}$F. Together with other previous work, our measurements determine the superallowed $1/2^{+}\to 1/2^{+}$ beta branch to the ground state in ${}^{19}$F to be 99.9878(7)\%, which is three times more precise than known previously. The implications of these measurements for testing a variety of weak interaction symmetries are discussed briefly.

   nucl-exPRC(2019)·10 citations
2. 02*

   Net-baryon multiplicity distribution consistent with lattice QCD

   Adam Bzdak🇵🇱 · Volker Koch🇺🇸

   We determine the net-baryon multiplicity distribution which reproduces all cumulants measured so far by lattice QCD. We present the dependence on the volume and temperature of this distribution. We find that for temperatures and volumes encountered in heavy ion reactions, the multiplicity distribution is very close to the Skellam distribution, making the experimental determination of it rather challenging. We further provide estimates for the statistics required to measure cumulants of the net-baryon and net-proton distributions.

   ↳ nucl-thhep-exhep-phnucl-exPRC(2019)·6 citations
3. 03*

   Measurement of Unpolarized and Polarized Cross Sections for Deeply Virtual Compton Scattering on the Proton at Jefferson Laboratory with CLAS

   N. Hirlinger Saylor · B. Guegan · V.D. Burkert · L. Elouadrhiri · M. Garcon · F.X. Girod · M. Guidal · H.S. Jo · V. Kubarovsky · S. Niccolai · P. Stoler · (CLAS Collaboration)

   This paper reports the measurement of polarized and unpolarized cross sections for the ep -> e'p' reaction, which is comprised of Deeply Virtual Compton Scattering (DVCS) and Bethe-Heitler (BH) processes, at an electron beam energy of 5.88 GeV at the Thomas Jefferson National Accelerator Facility using the Large Acceptance Spectrometer CLAS. The unpolarized cross sections and polarized cross section differences have been measured over broad kinematics, 0.10 < x_B < 0.58, 1.0 < Q^2 < 4.8 GeV^2, and 0.09 < -t < 2.00 GeV^2. The results are found to be consistent with previous CLAS data, and these new data are discussed in the framework of the generalized parton distribution approach. Calculations with two widely used phenomenological models, denoted VGG and KMSC, are approximately compatible with the experimental results over a large portion of the kinematic range of the data.

   ↳ hep-exhep-phnucl-exPRC(2018)·21 citations
4. 04*

   The effect of collisions with the wall on neutron-antineutron transitions

   Boris O. Kerbikov🇷🇺

   We examine what role do collisions with the wall play in neutron-antineutron transitions. The collision time for $n$ and $\bar{n}$ and the phase difference between reflected $n$ and $\bar{n}$ waves are calculated. It is shown that transitions inside the wall are negligible.

   ↳ hep-phnucl-exPLB(2019)·17 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.