242 research outputs found
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Recent SLAC measurements of the spin dependent structure functions for the proton and neutron
No full textThe authors present results from SLAC experiments E142 and E143 for the spin dependent structure functions of the proton g{sub 1}{sup p}(x, Q{sup 2}) and neutron g{sub 1}{sup n}(x,Q{sup 2}) measured in deep inelastic scattering of polarized electrons from a polarized target. Experiment E142 measures {integral}{sub 0}{sup 1} g{sub 1}{sup n}(x)dx = {minus}0.022 {+-} 0.011 at = 2 (GeV/c){sup 2} using a polarized {sup 3}He target. Experiment E143 measures {integral}{sub 0}{sup 1} g{sub 1}{sup p}(x)dx = 0.129 {+-} 0.011 at = 3 (GeV/c){sup 2} using a polarized NH{sub 3} target. These results are combined at Q{sup 2} = 3 (GeV/c){sup 2} to yield {integral}{sub 0}{sup 1} [g{sub 1}{sup p}(x) {minus} g{sub 1}{sup n}(x)]dx = 0.151 {+-} 0.015. The Bjorken sum rule predicts 0.171 {+-} 0.008
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Status of PEP and TPC/2/gamma/
No full textThe TPC/2/gamma/ program at PEP has been upgraded by increasing the PEP luminosity and by the adding of a vertex chamber to the TPC detector. These improvements will allow a strong program in B and /tau/ physics, and will contribute to ongoing studies in two-photon physics and hadronization. 10 refs., 3 figs
Simulation of a dc electron beam strongly influenced by self-fields
No full textA method is presented to simulate the transport of a dc charged particle beam strongly influenced by its self-fields. If the initial phase space of the beam is chosen to be a Kapchinskij-Vladimirskij distribution, the simulation is in agreement with the Kapchinskij-Vladimirskij envelope equations. The simulation was initialized with a Gaussian transverse momentum distribution to investigate the origin of current profiles measured in a 130 keV, 635 mA plasma-focused electron beam
Recent SLAC measurements of the spin dependent structure functions for the proton and neutron
No full text
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Highlights of SLD physics
No full textThe SLAC polarized electron beam allows the SLD experiment a high-precision measurement of sin{sup 2}{theta}{sub W}{sup eff} using the parity violating cross section asymmetry A{sub LR} at the e{sup +}e{sup {minus}} {yields} Z{sup o} vertex. The SLD also uses the small luminous e{sup +}e{sup {minus}} collision region and CCD vertex detector to tag heavy quark final states for probing the Z{sup o} {yields} q{bar q} vertex. Results are presented on the following selected topics: A{sub LR}, the Z{sup o} {yields} the Z{sup o} {yields} b{bar b} branching fraction R{sub b}, and the parity violating cross section asymmetries A{sub b} and A{sub b} and A{sub c} for the Z{sup o} {yields} b{bar b} and Z{sup o} {yields} b{bar b} and Z{sup o} {yields} c{bar c} final states
Assessment of Leadership Traits Required for the Intercollegiate Athletic Director Position
No full textThe purpose of this study was to a) examine leadership traits of effective Athletic Directors and b) determine the differences and similarities between NCAA Division I, II,III, and NAIA University Presidents’ and Athletic Directors’ assessments of the methods of leadership required for the position of Director of Intercollegiate Athletics, with particular regards to Autocratic, Democratic, Positive Feedback, Training and Instruction, Social Support, and Situational Consideration Behaviors, which are concepts drawn from Zhang et al.’s (1997) Revised Leadership Scale for Sports (RLSS), an instrument specifically designed to measure research on sports-specific leadership behavior. A purposive sampling design was implemented. Fourteen participants with extensive experience in NCAA Division I, II, III, and NAIA intercollegiate athletics were recruited to secure expert insight. Participants included four University Presidents and four Athletic Directors, one each from NCAA Division I, II, III, and NAIA institutions. Remaining participants included two Conference Commissioners, two Head Coaches, and two Senior Athletic Administrators, all from NCAA Division I institutions. Semistructured interviews were implemented (Krueger & Casey, 2000). A listing of traits required for the Athletic Director role were collected through an inductive approach. Answers to series of follow-up questions provided the in-depth details of each behavior mentioned in the initial response. A series of structured questions—with each intended to be representative of each of the six RLSS constructs to confirm the construct validity for the current research—were implemented utilizing a deductive approach. A classical content analysis was applied to address the research question. A holistic coding approach was taken in reviewing the participants’ initial descriptions to identify types of traits associated with the Athletic Director role. A descriptive open-coding process was utilized to carefully code the data line-by-line to capture the overall meaning intended. A constant comparison analysis was conducted to systematically condense data into codes and then to develop themes. As a result, the following themes emerged as the leadership traits required for the intercollegiate Athletic Director position: (a) communicator, (b) driven, (c) personable, (d) poised, (e) principled, (f) self-aware, (g) skilled, and (h) visionary. Recommendations for future research and practical implications are offered
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