Tue·Sep 13, 2016Tuesday·September 13, 2016

1. 01*

   Measurement of long-range angular correlations and azimuthal anisotropies in high-multiplicity $p$$+$Au collisions at $\sqrt{s_{{}_{NN}}}=200$ GeV

   C. Aidala · Y. Akiba · M. Alfred · V. Andrieux · N. Apadula · H. Asano · B. Azmoun · V. Babintsev · N.S. Bandara · K.N. Barish · S. Bathe · A. Bazilevsky and 262 other authors

   We present the first measurements of long-range angular correlations and the transverse momentum dependence of elliptic flow $v_2$ in high-multiplicity $p$$+$Au collisions at $\sqrt{s_{{}_{NN}}}=200$ GeV. A comparison of these results with previous measurements in high-multiplicity $d$$+$Au and ${}^3\mathrm{He}$$+$Au collisions demonstrates a relation between $v_2$ and the initial collision eccentricity ${\epsilon }_2$, suggesting that the observed momentum-space azimuthal anisotropies in these small systems have a collective origin and reflect the initial geometry. Good agreement is observed between the measured $v_2$ and hydrodynamic calculations for all systems, and an argument disfavoring theoretical explanations based on momentum-space domain correlations is presented. The set of measurements presented here allows us to leverage the distinct intrinsic geometry of each of these systems to distinguish between different theoretical descriptions of the long-range correlations observed in small collision systems.

   nucl-exPRC(2017)·91 citations
2. 02*

   Beta spectrum of unique first-forbidden decays as a novel test for fundamental symmetries

   Ayala Glick-Magid (HUJI)🇮🇱 · Yonatan Mishnayot (HUJI, WIS, SNRC)🇮🇱 · Ish Mukul (WIS)🇮🇱 · Michael Hass (WIS)🇮🇱 · Guy Ron (HUJI)🇮🇱 · Sergey Vaintraub (SNRC)🇮🇱 · Doron Gazit (HUJI)🇮🇱

   Within the Standard Model, the weak interaction of quarks and leptons is characterized by certain symmetry properties, such as maximal breaking of parity and favored helicity. These are related to the $V-A$ structure of the weak interaction. These characteristics were discovered by studying correlations in the directions of the outgoing leptons in nuclear beta decays. These days, correlation measurements in nuclear beta decays are intensively studied to probe for signatures for deviations from these symmetries, which are an indication of Beyond Standard Model physics. We show that the structure of the energy spectrum of emitted electrons in unique first-forbidden $\beta$-decays is sensitive to the symmetries of the weak interaction, and thus can be used as a novel probe of physics beyond the standard model. Furthermore, the energy spectrum gives constraints both in the case of right and left coupling of the new symmetry currents. We show that a measurement with modest energy resolution of about 20 keV is expected to lead to new constraints on beyond the standard model interactions with tensor symmetry.

   nucl-exhep-phnucl-thPLB(2017)·27 citations
3. 03*

   Search for Two-Neutrino Double Electron Capture of ${}^{124}$Xe with XENON100

   The XENON Collaboration: E. Aprile🇺🇸 · J. Aalbers🇳🇱 · F. Agostini🇮🇹 · M. Alfonsi🇩🇪 · F. D. Amaro🇵🇹 · M. Anthony🇺🇸 · F. Arneodo🇦🇪 · P. Barrow🇨🇭 · L. Baudis🇨🇭 · B. Bauermeister🇸🇪 · M. L. Benabderrahmane🇦🇪 · T. Berger🇺🇸 and 104 other authors

   Two-neutrino double electron capture is a rare nuclear decay where two electrons are simultaneously captured from the atomic shell. For ${}^{124}$Xe this process has not yet been observed and its detection would provide a new reference for nuclear matrix element calculations. We have conducted a search for two-neutrino double electron capture from the K-shell of ${}^{124}$Xe using 7636 kg$\cdot$d of data from the XENON100 dark matter detector. Using a Bayesian analysis we observed no significant excess above background, leading to a lower 90 % credibility limit on the half-life $T_{1/2}>6.5\times 10^{20}$ yr. We also evaluated the sensitivity of the XENON1T experiment, which is currently being commissioned, and find a sensitivity of $T_{1/2}>6.1\times 10^{22}$ yr after an exposure of 2 t$\cdot$yr.

   nucl-exphysics.ins-detPRC(2017)·20 citations
4. 04*

   Inclusive $\psi$(2S) production at forward rapidity in pp, p-Pb and Pb-Pb collisions with ALICE at the LHC

   Biswarup Paul (for the ALICE Collaboration)🇮🇳

   The ALICE Collaboration has studied inclusive $\psi$(2S) production in pp, p-Pb and Pb-Pb collisions with the ALICE Muon Spectrometer which covers the rapidity range 2.5 $<$ $y_{\mathrm{lab}}$ $<$ 4. The $\psi$(2S) measurement was performed in the dimuon decay channel. The $\psi$(2S) production cross-section and $\psi$(2S) to J/$\psi$ cross-section ratio in pp collisions will be presented, both integrated and differential in rapidity and in transverse momentum. In p-Pb collisions, $\psi$(2S) results will be compared to the J/$\psi$ ones by means of the production cross-section ratio and the double ratio [$\psi$(2S)/J/$\psi$]${}_{\mathrm{pPb}}$/[$\psi$(2S)/J/$\psi$]${}_{\mathrm{pp}}$ studied as a function of the resonance transverse momentum and event activity of the collision. The $\psi$(2S) nuclear modification factor, $R_{\mathrm{pPb}}$, will also be presented. Theoretical models based on nuclear shadowing, coherent energy loss or both cannot describe our results. Therefore other mechanisms must be invoked in order to describe the $\psi$(2S) production. Finally, results on $\psi$(2S) production in Pb-Pb collisions will be shown in two transverse momentum ranges as a function of centrality.

   nucl-exPoS(2017)·0 citations
5. 05*

   Hydrodynamic Predictions for Pb+Pb Collisions at 5.02 A TeV

   Scott McDonald🇨🇦 · Chun Shen🇨🇦 · Francois Fillion-Gourdeau🇨🇦 · Sangyong Jeon🇨🇦 · Charles Gale🇨🇦

   Predictions and comparisons of hadronic flow observables for Pb+Pb collisions at 2.76 A TeV and 5.02 A TeV are presented using a hydrodynamics + hadronic cascade hybrid approach. Initial conditions are generated via a new formulation of the IP-Glasma model and then evolved using relativistic viscous hydrodynamics and finally fed into transport cascade in the hadronic phase. The results of this work show excellent agreement with the recent charged hadron anisotropic flow measurements from the ALICE collaboration of Pb+Pb collisions at 5.02 A TeV. Event-by-event distributions of charged hadron v n , flow event-plane correlations, and flow factorization breaking ratios are compared with existing measurements at 2.76 A TeV, and are predicted at 5.02 A TeV. Further predictions of identified hadron observables (for both light and multi-strange hadrons), such as p T -spectra and anisotropic flow coefficients, are presented.

   ↳ hep-phnucl-exnucl-thPRC(2017)·142 citations
6. 06*

   Correlating charge radius with quadrupole deformation and $B(E2)$ in atomic nuclei

   Bao-Hua Sun🇨🇳 · Chuan-Ye Liu🇨🇳 · Hao-Xin Wang🇨🇳

   A very good linear correlation is found between the four-point charge radius relation $\delta R_{2p-2n}(Z,N)$ with that of quadrupole deformation data in even-even nuclei. This results in a further improved charge radius relation that holds in a precision of about 5$\times 10^{-3}$ fm. Such correlations are also seen in global nuclear models, their precisions, however, are not enough to be consistent with the experimental data. The new relation between charge radii and deformation of even-even nuclei can be generalized to the reduced electric quadrupole transition probability $B(E2)$ between the first $2^{+}$ state and the $0^{+}$ ground state, and the mean lifetime $\tau$ of the first 2${}^{+}$ state.

   ↳ nucl-thnucl-exPRC(2017)·17 citations
7. 07*

   Possible strange hidden-charm pentaquarks from ${\Sigma }_c^{(\ast )}{\bar{D}}_s^{\ast }$ and ${\Xi }_c^{{(}^{\prime },\ast )}{\bar{D}}^{\ast }$ interactions

   Rui Chen🇨🇳 · Jun He🇨🇳 · Xiang Liu🇨🇳

   Using the one-boson-exchange model, we investigate the ${\Lambda }_c{\bar{D}}_s^{\ast }$, ${\Sigma }_c{\bar{D}}_s^{\ast }$, ${\Sigma }_c^{\ast }{\bar{D}}_s^{\ast }$, ${\Xi }_c{\bar{D}}^{\ast }$, ${\Xi }_c^{\prime }{\bar{D}}^{\ast }$, and ${\Xi }_c^{\ast }{\bar{D}}^{\ast }$ interactions by considering the one-eta-exchange and/or one-pion-exchange contributions. We further predict the existence of hidden-charm molecular pentaquarks. Promising candidates for hidden-charm molecular pentaquarks include a ${\Xi }_c^{\prime }{\bar{D}}^{\ast }$ state with $0({\frac{1}{2}}^{-})$ and the ${\Xi }_c^{\ast }{\bar{D}}^{\ast }$ states with $0({\frac{1}{2}}^{-})$ and $0({\frac{3}{2}}^{-})$. Experimental searches for these predicted hidden-charm molecular pentaquarks are an interesting future research topic for experiments like LHCb.

   ↳ hep-phhep-exhep-latnucl-ex+1CPC(2017)·95 citations
8. 08*

   Elastic scattering, polarization and absorption of relativistic antiprotons on nuclei

   A.B. Larionov🇩🇪 · H. Lenske🇩🇪

   We perform Glauber model calculations of the antiproton-nucleus elastic and quasielastic scattering and absorption in the beam momentum range $\sim 0.5÷10$ GeV/c. A good agreement of our calculations with available LEAR data and with earlier Glauber model studies of the $\bar{p}A$ elastic scattering allows us to make predictions at the beam momenta of $\sim 10$ GeV/c, i.e. at the regime of the PANDA experiment at FAIR. The comparison with the proton-nucleus elastic scattering cross sections shows that the diffractive minima are much deeper in the $\bar{p}A$ case due to smaller absolute value of the ratio of the real-to-imaginary part of the elementary elastic amplitude. Significant polarization signal for $\bar{p}A$ elastic scattering at 10 GeV/c is expected. We have also revealed a strong dependence of the $\bar{p}A$ absorption cross section on the slope parameter of the transverse momentum dependence of the elementary $\bar{p}N$ amplitude. The $\bar{p}A$ optical potential is discussed.

   ↳ nucl-thhep-exhep-phnucl-exNPA(2017)·12 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.