Thu·Oct 30, 2014Thursday·October 30, 2014

1. 01*

   High accuracy determination of the ${}^{238}$U/${}^{235}$U fission cross section ratio up to $\sim$1 GeV at n_TOF (CERN)

   C. Paradela🇪🇸 · M. Calviani🇨🇭 · D. Tarrío · E. Leal-Cidoncha🇪🇸 · L.S. Leong🇫🇷 · L. Tassan-Got🇫🇷 · C. Le Naour🇫🇷 · I. Duran🇪🇸 · N. Colonna🇮🇹 · L. Audouin🇫🇷 · M. Mastromarco🇮🇹 · S. Lo Meo🇮🇹 and 95 other authors

   The ${}^{238}$U to ${}^{235}$U fission cross section ratio has been determined at n_TOF up to $\sim$1 GeV, with two different detection systems, in different geometrical configurations. A total of four datasets have been collected and compared. They are all consistent to each other within the relative systematic uncertainty of 3-4%. The data collected at n_TOF have been suitably combined to yield a unique fission cross section ratio as a function of the neutron energy. The result confirms current evaluations up to 200 MeV. A good agreement is also observed with theoretical calculations based on the INCL++/Gemini++ combination up to the highest measured energy. The n_TOF results may help solving a long-standing discrepancy between the two most important experimental dataset available so far above 20 MeV, while extending the neutron energy range for the first time up to $\sim$1 GeV.

   nucl-exPRC(2015)·22 citations
2. 02*

   Search for a $\pi \Lambda N-\pi \Sigma N$ dibaryon in p+p@3.5 GeV

   J.C. Berger-Chen🇩🇪 · L. Fabbietti🇩🇪

   This work is dedicated to the search for a $\pi \Lambda N-\pi \Sigma N$ resonance $\mathcal{Y}$ with the quantum numbers ($Y,I,J^P$) = (1,3/2,$2^{+}$). The double charged $\Sigma (1385)N-\Delta (1232)Y$ quasibound state was looked for in the reaction $pp\to {\mathcal{Y}}^{++}{K}^0$ with its unique decay into ${\Sigma }^{+}$ and proton measured with the HADES setup at a kinetic beam energy of 3.5 GeV. The analysis including background determination and a description of the data with a $K_S^0$ Monte Carlo cocktail are presented.

   nucl-ex6 citations
3. 03*

   Principal component analysis of event-by-event fluctuations

   Rajeev S. Bhalerao🇮🇳 · Jean-Yves Ollitrault🇫🇷 · Subrata Pal🇮🇳 · Derek Teaney🇺🇸

   We apply principal component analysis to the study of event-by-event fluctuations in relativistic heavy-ion collisions. This method brings out all the information contained in two-particle correlations in a physically transparent way. We present a guide to the method, and apply it to multiplicity fluctuations and anisotropic flow, using ALICE data and simulated events. In particular, we study elliptic and triangular flow fluctuations as a function of transverse momentum and rapidity. This method reveals previously unknown subleading modes in both rapidity and transverse momentum for the momentum distribution as well as elliptic and triangular flows.

   ↳ nucl-thhep-phnucl-exPRL(2015)·92 citations
4. 04*

   On Recent Weak Single Pion Production Data

   J. T. Sobczyk🇵🇱 · J. Zmuda🇵🇱

   MiniBooNE [1] and MINERvA [2] charge current {\pi} + production data in the Delta region are discussed. It is argued that despite the differences in neutrino flux they measure the same dynamical mechanism of pion production and should be strongly correlated. The correlation is clearly seen in the Monte Carlo simulations done with NuWro generator but is missing in the data. Both normalization and the shape of the ratio of measured differential cross sections in pion kinetic energy are different from the Monte Carlo results, in the case of normalization a discrepancy is by a factor of 1.49.

   ↳ nucl-thhep-exhep-phnucl-exPRC(2015)·43 citations
5. 05*

   Basic phenomenology for relativistic heavy-ion collisions

   Wojciech Florkowski🇵🇱

   Basic concepts used to interpret the soft-hadronic data collected in relativistic heavy-ion collisions are reviewed at the elementary level.

   ↳ nucl-thhep-phnucl-exActa Phys.Polon.B(2014)·25 citations
6. 06*

   New Results from RENO and The 5 MeV Excess

   Seon-Hee Seo (for the RENO Collaboration)🇰🇷

   One of the main goals of RENO (Reactor Experiment for Neutrino Oscillation) is to measure the smallest neutrino mixing angle {\theta}13 using reactor neutrinos in Korea. RENO is the first reactor experiment taking data with two identical detectors in different locations (Near and Far), which is critical to reduce systematic uncertainty in reactor neutrino flux. Our data taking has been almost continuous since Aug. 2011 and we have collected about 434,000 (54,000) electron anti-neutrinos in the Near (Far) detector by 2013. Using this data (about 800 live days) we present a new result on {\theta}13: sin22{\theta}13 = 0.101 +/- 0.008 (stat.) +/- 0.010 (syst.). We also report the 5 MeV excess present in the prompt signal spectrum in our data, and its correlation with our reactor thermal power.

   ↳ hep-exnucl-exphysics.ins-detAIP Conf.Proc.(2015)·108 citations
7. 07*

   Search for Muonic Atoms at RHIC

   Kefeng Xin (for the STAR Collaboration)🇺🇸

   We present the search results for muonic atoms on $\sqrt{s_{NN}}=200$ GeV Au+Au collisions collected by the STAR experiment at RHIC. With the muon identification at low momentum, the invariant mass spectra were reconstructed. Clear signals are observed at the expected atom masses. Two particle correlations show that the production of the daughter particles happens at the same space-time point, presenting the signature of atom ionization. The fraction of primordial muons is extracted from $\pi$-$\mu$ correlations.

   ↳ hep-exnucl-ex2 citations
8. 08*

   Review of QCD, Quark-Gluon Plasma, Heavy Quark Hybrids, and Heavy Quark State production in p-p and A-A collisions

   Leonard S. Kisslinger🇺🇸 · Debasish Das🇮🇳

   This is a review of the Quantum Chromodynamics Cosmological Phase Transitions, the Quark-Gluon Plasma, the production of heavy quark states via p-p collisions and RHIC (Relativistic Heavy Ion Collisions) using the mixed hybrid theory for the $\Psi (2S)$ and ${\rm Y}(3S)$ states; and the possible detection of the Quark-Gluon Plasma via heavy quark production using RHIC. Recent research on fragmentation for the production of D mesons is reviewed, as is future theoretical and experimental research on the Collins and Sivers fragmentation functions for pions produced in polarized p-p collisions.

   ↳ hep-phnucl-exInt.J.Mod.Phys.A(2016)·11 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.