Thu·Jul 16, 2009Thursday·July 16, 2009

1. 01*

   e+A physics at a future Electron-Ion Collider

   M. A. C. Lamont🇺🇸

   A future Electron-Ion Colllider (EIC) is the ideal laboratory for studying the gluon distributions in both nucleons and nuclei for $\sqrt{s}$ = 63 - 158 (40 - 110) GeV/A for e+p (e+A) collisions. Whilst gluon distributions have been studied extensively in nucleons at HERA, there is very little information on them for $x<$ 0.1 in nuclei. The rapid increase in the gluon momentum distribution at low-$x$ in nucleons found at HERA, if not tamed, leads to the violation of the Froissart Unitarity Bound at small-$x$. This can be achieved in non-linear QCD by allowing for the recombination of low-$x$ gluons until saturation of gluon densities occurs. Understanding saturation is an important goal not just for QCD in general, but also in understanding the initial conditions of heavy-ion collisions in particular. In this paper, I describe the physics that will be explored by e+A collisions, where saturation is more easily explored in this mode at an EIC than in e+p collisions due to the large nuclear densities achieved.

   nucl-ex0 citations
2. 02*

   Strangeness production in d+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV in STAR

   Xianglei Zhu (for the STAR Collaboration)🇨🇳

   We report on the measurements of strange hadron ($K_S^0$, $\Lambda$, $\Xi$) production in the most central (0-20%) d+Au collisions at \sqrt{s_{NN}} = 200 GeV in STAR. Significant strangeness enhancement is observed in the most central d+Au collisions, especially for multi-strange hyperons ($\Xi$). The nuclear modification factor ($R_{dAu}$) of identified particles shows possible particle type -- baryon (protons, $\Lambda$), meson ($\pi$,$K_S^0$, $\varphi$) -- dependence at intermediate $p_T$ (2 - 3.5 GeV/c), indicating that the final state may have an impact on the Cronin effect.

   nucl-exNPA(2009)·6 citations
3. 03*

   The extraction of $\varphi -N$ total cross section from $d(\gamma ,p{K}^{+}{K}^{-})n$

   X. Qian · W. Chen · H. Gao · et al

   We report on the first measurement of the differential cross section of $\varphi$-meson photoproduction for the $d(\gamma ,p{K}^{+}{K}^{-})n$ exclusive reaction channel. The experiment was performed using a \textcolor{black}{tagged-photon} beam and the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. A combined analysis using data from the $d(\gamma ,p{K}^{+}{K}^{-})n$ channel and those from a previous publication on coherent $\varphi$ production on the deuteron has been carried out to extract the $\varphi -N$ total cross section, ${\sigma }_{\varphi N}$. The extracted $\varphi -N$ total cross section favors a value above 20 mb. This value is larger than the value extracted using vector-meson dominance models for $\varphi$ photoproduction on the proton.

   nucl-exPLB(2009)·35 citations
4. 04*

   Constraining nonstandard neutrino-quark interactions with solar, reactor and accelerator data

   F. J. Escrihuela🇪🇸 · O. G. Miranda🇲🇽 · M. A. Tortola🇩🇪 · J. W. F. Valle🇪🇸

   We present a reanalysis of nonstandard neutrino-down-quark interactions of electron and tau neutrinos using solar, reactor and accelerator data. In addition updating the analysis by including new solar data from SNO phase III and Borexino, as well as new KamLAND data and solar fluxes, a key role is played in our analysis by the combination of these results with the CHARM data. The latter allows us to better constrain the axial and axial-vector electron and tau-neutrino nonstandard interaction parameters characterizing the deviations from the Standard Model predictions.

   ↳ hep-phastro-ph.SRhep-exnucl-exPRD(2009)·103 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.