Wed·May 13, 2015Wednesday·May 13, 2015

1. 01*

   Directional detection of dark matter in universal bound states

   Ranjan Laha🇺🇸

   It has been suggested that several small-scale structure anomalies in $\Lambda$CDM cosmology can be solved by strong self-interaction between dark matter particles. It was shown by Braaten and Hammer that the presence of a near threshold S-wave resonance can make the scattering cross section at nonrelativistic speeds come close to saturating the unitarity bound. This can result in the formation of a stable bound state of two asymmetric dark matter particles (we call the bound state as darkonium). Laha and Braaten studied the nuclear recoil energy spectrum in dark matter direct detection experiments due to this incident bound state. Here we study the angular recoil spectrum, and show that it is uniquely determined up to normalization by the S-wave scattering length. Observing this angular recoil spectrum in a dark matter directional detection experiment will uniquely determine many of the low-energy properties of dark matter independent of the underlying dark matter microphysics.

   ↳ hep-phastro-ph.COhep-exnucl-ex+1PRD(2015)·48 citations
2. 02*

   $\Xi (1690)$ as a $\bar{K}\Sigma$ molecular state

   Takayasu Sekihara (RCNP, Osaka U.)🇯🇵

   We show that a ${\Xi }^{\ast }$ pole can be dynamically generated near the $\bar{K}\Sigma$ threshold as an $s$-wave $\bar{K}\Sigma$ molecular state in a coupled-channels unitary approach with the leading-order chiral interaction. This ${\Xi }^{\ast }$ state can be identified with the $\Xi (1690)$ resonance with $J^P=1/2^{-}$. We find that the experimental ${\bar{K}}^0\Lambda$ and $K^{-}{\Sigma }^{+}$ mass spectra are qualitatively reproduced with the ${\Xi }^{\ast }$ state. Moreover we theoretically investigate properties of the dynamically generated ${\Xi }^{\ast }$ state.

   ↳ hep-phhep-exhep-latnucl-ex+1PTEP(2015)·29 citations
3. 03*

   Parton energy loss and particle production at high momenta from ALICE

   Redmer Alexander Bertens (for the ALICE collaboration)🇳🇱

   Partons, produced in the early stages of heavy-ion collisions, lose energy while propagating through the collision medium. This energy loss can be studied by comparing particle yields in different systems (pp, p--Pb, Pb--Pb). In addition, particle yields in different systems can be used to study hadronization mechanisms.

   ↳ hep-exnucl-exProceedings of the 50 th RENCONTRES DE MO…·1 citation

* 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.