76 research outputs found
Measurement of -meson production in CuAu at GeV and UU at GeV
The PHENIX experiment reports systematic measurements at the Relativistic
Heavy Ion Collider of -meson production in asymmetric CuAu collisions
at =200 GeV and in UU collisions at =193
GeV. Measurements were performed via the decay
channel at midrapidity . Features of -meson production
measured in CuCu, CuAu, AuAu, and UU collisions were found to not
depend on the collision geometry, which was expected because the yields are
averaged over the azimuthal angle and follow the expected scaling with
nuclear-overlap size. The elliptic flow of the meson in CuAu,
AuAu, and UU collisions scales with second order participant eccentricity
and the length scale of the nuclear overlap region (estimated with the number
of participating nucleons). At moderate , -meson production measured
in CuAu and UU collisions is consistent with coalescence-model
predictions, whereas at high the production is in agreement with
expectations for in-medium energy loss of parent partons prior to their
fragmentation. The elliptic flow for mesons measured in CuAu and
UU collisions is well described by a (2+1)D viscous-hydrodynamic model with
specific-shear viscosity .Comment: 411 authors from 76 institutions, 16 pages, 12 figures, 9 tables,
2012 data. v1 is version submitted to Physical Review C. Plain text data
tables for the points plotted in figures for this and previous PHENIX
publications are (or will be) publicly available at
http://www.phenix.bnl.gov/papers.htm
Sexual Partnerships, Risk Behaviors, and Condom Use Among Low-Income Heterosexual African Americans: A Qualitative Study
The purpose of the current investigation was to contextualize the sexual relationships and risk behaviors of heterosexually active African Americans. A total of 38 participants (20 females and 18 males) aged 18–44 years were recruited in a large city in the southeastern U.S. to participate in focus group discussions exploring sexual partnerships, general condom perceptions, and condom negotiation. Results indicated that participants distinguished among at least three partner types–one-night stand, “regular” casual partner, and main partner. Partner types were found to shape and influence types of sexual behaviors, perceptions of risk and condom use, and condom negotiation. Participants also shared general perceptions about condoms and elucidated situations in which intentions to use condoms were not realized. Gender differences emerged in many of these areas. Implications of these findings are discussed and directions for future research on sexual partnerships and risk behavior are offered
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