We point out new ways to search for charmless baryonic B decays: baryon pair production in association with η ′ is very likely as large as or even a bit larger than two body Kπ/ππ modes. We extend our argument, in weaker form, to B → γ + X s and ℓν + X. Although calculations are not reliable, estimates give branching ratios of order 10 −5 –10 −6 , where confidence is gained from recent experime...

We investigate, at both zero and finite temperature, the properties of strangelets versus the electric charge Z and strangeness S. The strangelet radius is not a monotonic function of either charge or strangeness, and a minimum is reached in the (Z, S) plane. However, the thermodynamically stable strangelets do not correspond to the radius minimum. The minimum radius always appears at positive ...

Low-scale supersymmetry breaking in string motivated theories implies the presence of O(100TeV) scale moduli, which generically lead to a significant modification of the history of the universe prior to Big Bang Nucleosynthesis. Such an approach implies a nonthermal origin for dark matter resulting from scalar decay, where the lightest supersymmetric particle can account for the observed dark m...

We report measurements of the ratios of identified hadrons (π,K,p,Λ) in Au+Au collisions at √ s N N = 200 GeV as a function of both collision centrality and transverse momentum (p T). Ratios of anti-baryon to baryon yields are independent of p T within 2<p T <6 GeV/c indicating that, for such a range, our measurements are inconsistent with theoretical pQCD calculations predicting a decrease due...

We investigate whether baryogenesis is possible at a second order electroweak phase transition. We find that under rather general conditions, the departure from thermal equilibrium is suppressed by the expansion rate of the Universe, and hence baryon production is also suppressed by the expansion rate. We conclude that if no additional sources of departure from thermal equilibrium such as topol...

We report the measurement of and ¯ yields and inverse slope parameters in d+Au collisions at √ s NN = 200 GeV at forward and backward rapidities (y = ±2.75), using data from the STAR forward time projection chambers. The contributions of different processes to baryon transport and particle production are probed exploiting the inherent asymmetry of the d+Au system. Comparisons to model calculati...

Netrino oscillation experiments discover that (left-handed) neutrinos have masses much less than charged leptons and quarks in the Standard Model. One solution to the light neutrino mass puzzle is the seesaw model where right-handed neutrinos are introduced with large Majorana masses. The heavy Majorana right-handed neutrinos lead to lepton number violation in the early universe. They decay int...

The amount of baryon stopping in central P b + P b collisions from 20 – 160 A·GeV as well as hyperon rapidity distributions are calculated within the UrQMD model in comparison to experimental data at 40, 80 and 160 A·GeV taken recently from the NA49 collaboration. Furthermore, the amount of baryon stopping at 160 A·GeV for P b+P b collisions is studied as a function of centrality in comparison ...

Antikaon production from heavy ion collisions at energies available from the Alternating Gradient Synchrotron (AGS) at the Brookhaven National Laboratory is studied in a relativistic transport (ART) model. We include contributions from the baryon-baryon, meson-baryon, and meson-meson interactions. The final-state interaction of antikaons via both absorption and elastic scattering by nucleons an...

Within a hadronic transport model we study in detail contributions to kaon yields and momentum spectra from various baryon (resonance)-baryon (resonance) and πN interactions in heavy-ion collisions at beam energies near the free-space kaon production threshold. It is found that the finite lifetime of baryon resonances affects significantly the shape of kaon spectra, and the high energy parts of...