Tue·Feb 28, 2017Tuesday·February 28, 2017

1. 01*

   Fully coupled-channel complex scaling method for the $K^{-}pp$ system

   Akinobu Doté🇯🇵 · Takashi Inoue🇯🇵 · Takayuki Myo🇯🇵

   We have developed a fully coupled-channel complex scaling method (ccCSM) for the study of the most essential kaonic nucleus, $‘‘K^{-}pp,"$ which is a resonant state of a $\bar{K}NN$-$\pi \Sigma N$-$\pi \Lambda N$ coupled-channel system based on a theoretical viewpoint. By employing the ccCSM and imposing the correct boundary condition of resonance, the coupled-channel problem is completely solved using a phenomenological energy-independent potential. As a result of the ccCSM calculation of $‘‘K^{-}pp,"$ in which all three channels are treated explicitly, we have obtained three-body resonance as a Gamow state. The resonance pole indicates that the binding energy of $‘‘K^{-}pp"$ and the half value of its mesonic decay width are 51 MeV and 16 MeV, respectively. In the analysis of the resonant wave function obtained using the ccCSM, we clarify the spatial configuration and channel compositions of $‘‘K^{-}pp."$ Compared with past studies of single-channel calculations based on effective $\bar{K}N$ potentials, the current study provides a guideline for the determination of the $\bar{K}N$ energy to be used in effective potentials.

   ↳ nucl-thnucl-exPRC(2017)·28 citations
2. 02*

   Short-baseline electron antineutrino disappearance study by using neutrino sources from ${}^{13}$C + ${}^9$Be reaction

   Jae Won Shin🇰🇷 · Myung-Ki Cheoun🇰🇷 · Toshitaka Kajino🇯🇵 · Takehito Hayakawa🇯🇵

   To investigate the existence of sterile neutrino, we propose a new neutrino production method using ${}^{13}$C beams and a ${}^9$Be target for short-baseline electron antineutrino (${\bar{\nu }}_e$) disappearance study. The production of secondary unstable isotopes which can emit neutrinos from the ${}^{13}$C + ${}^9$Be reaction is calculated with three different nucleus-nucleus (AA) reaction models. Different isotope yields are obtained using these models, but the results of the neutrino flux are found to have unanimous similarities. This feature gives an opportunity to study neutrino oscillation through shape analysis. In this work, expected neutrino flux and event rates are discussed in detail through intensive simulation of the light ion collision reaction and the neutrino flux from the beta decay of unstable isotopes followed by this collision. Together with the reactor and accelerator anomalies, the present proposed ${\bar{\nu }}_e$ source is shown to be a practically alternative test of the existence of the $\Delta m^2$ $\sim$ 1 eV${}^2$ scale sterile neutrino.

   ↳ physics.ins-detastro-ph.IMnucl-exJCAP(2017)·1 citation
3. 03*

   Suppression of maximal linear gluon polarization in angular asymmetries

   Daniel Boer🇳🇱 · Piet J. Mulders🇳🇱 · Jian Zhou🇨🇳 · Ya-jin Zhou🇨🇳

   We perform a phenomenological analysis of the $\cos 2\varphi$ azimuthal asymmetry in virtual photon plus jet production induced by the linear polarization of gluons in unpolarized $pA$ collisions. Although the linearly polarized gluon distribution becomes maximal at small $x$, TMD evolutionleads to a Sudakov suppression of the asymmetry with increasing invariant mass of the ${\gamma }^{\ast }$-jet pair. Employing a small-$x$ model input distribution, the asymmetry is found to be strongly suppressed under TMD evolution, but still remains sufficiently large to be measurable in the typical kinematical region accessible at RHIC or LHC at moderate photon virtuality, whereas it is expected to be negligible in $Z/W$-jet pair production at LHC. We point out the optimal kinematics for RHIC and LHC studies, in order to expedite the first experimental studies of the linearly polarized gluon distribution through this process. We further argue that this is a particularly clean process to test the $k_t$-resummation formalism in the small-$x$ regime.

   ↳ hep-phhep-exnucl-exJHEP(2017)·50 citations
4. 04*

   Amplitude reconstruction from complete electroproduction experiments and truncated partial-wave expansions

   L. Tiator🇩🇪 · R. L. Workman🇺🇸 · Y. Wunderlich🇩🇪 · H. Haberzettl🇺🇸

   We compare the methods of amplitude reconstruction, for a complete experiment and a truncated partial-wave analysis, applied to the electroproduction of pseudoscalar mesons. We give examples which show, in detail, how the amplitude reconstruction (observables measured at a single energy and angle) is related to a truncated partial-wave analysis (observables measured at a single energy and a number of angles). A connection is made to existing data.

   ↳ nucl-thnucl-exPRC(2017)·22 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.