Measurement of the Charged Multiplicities in b, c and Light Quark Events from Z0 Decays

Average charged multiplicities have been measured separately in $b$, $c$ and light quark ($u,d,s$) events from $Z^0$ decays measured in the SLD experiment. Impact parameters of charged tracks were used to select enriched samples of $b$ and light quark events, and reconstructed charmed mesons were used to select $c$ quark events. We measured the charged multiplicities: $\bar{n}_{uds} = 20.21 \pm 0.10 (\rm{stat.})\pm 0.22(\rm{syst.})$, $\bar{n}_{c} = 21.28 \pm 0.46(\rm{stat.}) ^{+0.41}_{-0.36}(\rm{syst.})$ $\bar{n}_{b} = 23.14 \pm 0.10(\rm{stat.}) ^{+0.38}_{-0.37}(\rm{syst.})$, from which we derived the differences between the total average charged multiplicities of $c$ or $b$ quark events and light quark events: $\Delta \bar{n}_c = 1.07 \pm 0.47(\rm{stat.})^{+0.36}_{-0.30}(\rm{syst.})$ and $\Delta \bar{n}_b = 2.93 \pm 0.14(\rm{stat.})^{+0.30}_{-0.29}(\rm{syst.})$. We compared these measurements with those at lower center-of-mass energies and with perturbative QCD predictions. These combined results are in agreement with the QCD expectations and disfavor the hypothesis of flavor-independent fragmentation.Comment: 19 pages LaTex, 4 EPS figures, to appear in Physics Letters

Lost in space? The role of place in the delivery of social welfare law advice over the telephone and face-to-face

Advice that is provided exclusively over the telephone has been promoted by government as more convenient and accessible than face-to-face appointments. The resulting push towards telephone-only provision, as implemented by the Legal Aid, Sentencing and Punishment of Offenders Act 2012, challenges the long history of association between social welfare law advice and local delivery within disadvantaged communities. This article reports on qualitative research comparing telephone and face-to-face advice which uncovers the continuing relevance of place in the dynamics and mechanics of social welfare law provision. Familiarity with the geographical location, knowledge of local policies and procedures, relationships with opponents and allies, and an understanding of the ‘local legal culture’ mean that face-to-face advisers are often able to conduct their legal casework more effectively. Conversely, local knowledge is unlikely to be available to Community Legal Advice telephone advisers. This research suggests that, in addition, telephone-only advisers may be developing a more narrow understanding of the essential qualities of casework. These findings are particularly significant in view of the likely future expansion of remote methods of delivery in legal aid work

Angiotensin-converting enzyme inhibitor use by older adults is associated with greater functional responses to exercise

Objectives To assess the association between angiotensin converting enzyme inhibitors (ACEis) and improvements in the physical function of older adults in response to chronic exercise training. Design Secondary analysis of the Lifestyle Interventions and Independence for Elders Pilot (LIFE-P) study, a multisite randomized clinical trial to evaluate the effects of chronic exercise on the physical function of older adults at risk for mobility disability. Setting Four academic research centers within the United States. Participants Four hundred twenty-four individuals aged 70 to 89 with mild to moderate functional impairments categorized for this analysis as ACEi users, users of other antihypertensive drugs, or antihypertensive nonusers. Intervention A 12-month intervention of structured physical activity (PA) or health education promoting successful aging (SA). Measurements Change in walking speed during a 400-m test and performance on a battery of short-duration mobility tasks (Short Physical Performance Battery (SPPB)). Results Physical activity significantly improved the adjusted walking speed of ACEi users (P <.001) but did not of nonusers. PA improved the adjusted SPPB score of ACEi users (P <.001) and of persons who used other antihypertensive drugs (P =.005) but not of antihypertensive nonusers (P =.91).The percentage of ACEi users deriving clinically significant benefit from exercise training for walking speed (30%) and SPPB score (48%) was dramatically higher than for nonusers (14% and 12%, respectively). Conclusion For older adults at risk for disability, exercise-derived improvements in physical function were greater for ACEi users than users of other antihypertensive drugs and antihypertensive nonusers