Fri·Apr 10, 2015Friday·April 10, 2015

1. 01*

   Has a "$pp{K}^{-}$" Signal in p+p Reactions been Observed Yet?

   Eliane Epple🇩🇪 · Laura Fabbietti🇩🇪

   Our answer to the question posed in the title is: probably no. In this work we show that it is rather unlikely that the structure $X(2265)$ reported by the DISTO collaboration corresponds to a kaonic nuclear bound state. The main argumentation is based on the repetition of the DISTO analysis on the HADES data sample, containing p+p reactions at 3.5 GeV. We further discuss many aspects in connection with the $p{K}^{+}\Lambda$ final state and the $\Lambda (1405)$-resonance. The results evidence possible problematics in the interpretation of the DISTO data.

   nucl-exPRC(2015)·18 citations
2. 02*

   Everything Under the Sun: A Review of Solar Neutrinos

   G. D. Orebi Gann🇺🇸

   Solar neutrinos offer a unique opportunity to study the interaction of neutrinos with matter, a sensitive search for potential new physics effects, and a probe of solar structure and solar system formation. This paper describes the broad physics program addressed by solar neutrino studies, presents the current suite of experiments programs, and describes several potential future detectors that could address the open questions in this field. This paper is a summary of a talk presented at the Neutrino 2014 conference in Boston.

   nucl-exastro-ph.SRphysics.ins-det5 citations
3. 03*

   Observation of charge asymmetry dependence of pion elliptic flow and the possible chiral magnetic wave in heavy-ion collisions

   STAR Collaboration: L. Adamczyk · J. K. Adkins · G. Agakishiev · M. M. Aggarwal · Z. Ahammed · I. Alekseev · J. Alford · A. Aparin · D. Arkhipkin · E. C. Aschenauer · G. S. Averichev · Bairathi and 322 other authors

   We present measurements of ${\pi }^{-}$ and ${\pi }^{+}$ elliptic flow, $v_2$, at midrapidity in Au+Au collisions at $\sqrt{s_{{}_{\mathrm{NN}}}}=$ 200, 62.4, 39, 27, 19.6, 11.5 and 7.7 GeV, as a function of event-by-event charge asymmetry, $A_{ch}$, based on data from the STAR experiment at RHIC. We find that ${\pi }^{-}$ (${\pi }^{+}$) elliptic flow linearly increases (decreases) with charge asymmetry for most centrality bins at $\sqrt{s_{{}_{\mathrm{NN}}}}=\text{27 GeV}$ and higher. At $\sqrt{s_{{}_{\mathrm{NN}}}}=\text{200 GeV}$, the slope of the difference of $v_2$ between ${\pi }^{-}$ and ${\pi }^{+}$ as a function of $A_{ch}$ exhibits a centrality dependence, which is qualitatively similar to calculations that incorporate a chiral magnetic wave effect. Similar centrality dependence is also observed at lower energies.

   nucl-exnucl-thPRL(2015)·151 citations
4. 04*

   Measurement of double polarisation asymmetries in $\omega$-photoproduction

   H. Eberhardt🇩🇪 · T. C. Jude🇩🇪 · H. Schmieden🇩🇪 · A.V. Anisovich🇩🇪 · B. Bantes🇩🇪 · D. Bayadilov🇩🇪 · R. Beck🇩🇪 · Yu. Beloglazov🇷🇺 · M. Bichow🇩🇪 · S. Boese · K.-Th. Brinkmann🇩🇪 · Th. Challand🇨🇭 and 63 other authors

   The first measurements of the beam-target-helicity-asymmetries $E$ and $G$ in the photoproduction of $\omega$-mesons off protons at the CBELSA/TAPS experiment are reported. $E$ ($G$) was measured using circularly (linearly) polarised photons and a longitudinally polarised target. $E$ was measured over the photon energy range from close to threshold ($E_{\gamma }=1108$~MeV) to $E_{\gamma }=2300$~MeV and $G$ at a single energy interval of $1108<E_{\gamma }<1300$~MeV. Both measurements cover the full solid angle. The observables $E$ and $G$ are highly sensitive to the contribution of baryon resonances, with $E$ acting as a helicity filter in the $s$-channel. The new results indicate significant $s$-channel resonance contributions together with contributions from $t$-channel exchange processes. A partial wave analysis reveals strong contributions from the partial waves with spin-parity $J^P=3/2^{+},5/2^{+}$, and $3/2^{-}$.

   nucl-exPLB(2015)·18 citations
5. 05*

   Neutron single-particle strength in silicon isotopes: Constraining the driving forces of shell evolution

   S.R. Stroberg🇨🇦 · A. Gade🇺🇸 · J.A. Tostevin🇬🇧 · V.M. Bader🇺🇸 · T. Baugher🇺🇸 · D. Bazin🇺🇸 · J.S. Berryman🇺🇸 · B.A. Brown🇺🇸 · C.M. Campbell🇺🇸 · K.W. Kemper🇺🇸 · C. Langer🇩🇪 · E. Lunderberg🇺🇸 and 7 other authors

   Shell evolution is studied in the neutron-rich silicon isotopes 36,38,40 Si using neutron single-particle strengths deduced from one-neutron knockout reactions. Configurations involving neutron excita- tions across the N = 20 and N = 28 shell gaps are quantified experimentally in these rare isotopes. Comparisons with shell model calculations show that the tensor force, understood to drive the col- lective behavior in 42 Si with N = 28, is already important in determining the structure of 40 Si with N = 26. New data relating to cross-shell excitations provide the first quantitative support for repulsive contributions to the cross-shell T = 1 interaction arising from three-nucleon forces.

   nucl-exnucl-thPRC(2015)·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.