Mon·Jun 30, 2014Monday·June 30, 2014

1. 01*

   Reaction $\bar{p}p\to {\bar{\Lambda }}_c^{-}{\Lambda }_c^{+}$ within an effective Lagrangian model

   R. Shyam🇮🇳 · H. Lenske🇩🇪

   We study the charmed baryon production reaction $\bar{p}p\to {\bar{\Lambda }}_c^{-}{\Lambda }_c^{+}$ using the $t$-channel $D^0$ and $D^{\ast 0}$ meson exchange diagrams within an effective Lagrangian model involving the physical hadron masses and the coupling constants determined from SU(4) flavor symmetry. The initial and final state distortion effects are accounted for by using a simple eikonal approximation based procedure. The vertex parameters of our model have been checked by employing them to calculate the cross sections for the $\bar{p}p\to \bar{\Lambda }\Lambda$ reaction within a similar model. We predict the ${\bar{\Lambda }}_c^{-}{\Lambda }_c^{+}$ production cross sections in the range of 1-30 $\mu b$ for antiproton beam momenta varying between threshold to 20 GeV/c. The respective roles of $D^0$ and $D^{\ast 0}$ meson exchanges and also those of the vector and tensor components of the $D^{\ast 0}$ coupling have been investigated

   ↳ hep-phhep-exnucl-exnucl-thPRD(2014)·27 citations
2. 02*

   Breakdown of N = 8 magic number near the neutron drip line from parallel momentum distribution analyses

   Shubhchintak · R. Chatterjee🇮🇳

   Using two theoretical models (the post form finite range distorted wave Born approximation and the adiabatic model) we calculate the parallel momentum distribution of the charged core in the Coulomb breakup of Be isotopes on a heavy target at 100 MeV/u. We show that the full width at half maxima of the parallel momentum distribution can be used to study the breakdown of N = 8 magic number away from the valley of stability.

   ↳ nucl-thnucl-exPRC(2014)·5 citations
3. 03*

   Dressed Quark Mass Dependence of Pion and Kaon Form Factors

   Y. Ninomiya🇯🇵 · W. Bentz🇯🇵 · I.C. Cloët🇺🇸

   The structure of hadrons is described well by the Nambu--Jona-Lasinio (NJL) model, which is a chiral effective quark theory of QCD. In this work we explore the electromagnetic structure of the pion and kaon using the three-flavor NJL model, including effects of confinement and a pion cloud at the quark level. In the calculation there is only one free parameter, which we take as the dressed light quark ($u$ and $d$) mass. In the regime where the dressed light quark mass is approximately $0.25$GeV, we find that the calculated values of the kaon decay constant, current quark masses, and quark condensates are consistent with experiment and QCD based analyses. We also investigate the dressed light quark mass dependence of the pion and kaon electromagnetic form factors, where comparison with empirical data and QCD predictions also favors a dressed light quark mass near $0.25$GeV.

   ↳ nucl-thhep-phnucl-exPRC(2015)·28 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.