OBJECTIVE To explore the associations between semen characteristics and subsequent risk of testicular cancer. DESIGN Cohort study. PARTICIPANTS 32 442 men who had a semen analysis done at the Sperm Analysis Laboratory in Copenhagen during 1963-95. MAIN OUTCOME MEASURE Standardised incidence ratios of testicular cancer compared with total population of… (More)
Views expressed in this paper, however, are those of the authors alone, and do not necessarily represent positions of the Campaign for Educational Equity or of Teachers College. We are grateful for the advice and assistance we have received from scholars and policy experts (None of these are responsible for our failure to follow their advice or heed their… (More)
We present a measurement of time-dependent CP asymmetries and an updated determination of the CP-odd fraction in the decay B 0 → D * + D * −. The measurements are derived from a data sample of 88 × 10 6 B ¯ B pairs collected by the BABAR detector at the PEP-II energy asymmetric B Factory at SLAC. All results are preliminary.
A search for the exclusive radiative decays B → ρ(770)γ and B 0 → ω(782)γ is performed on a sample of 84 million BB events collected by the BABAR detector at the P EP − II asymmetric e + e − collider. No significant signal is seen in any of the channels. We set preliminary upper limits of B[B 0 → ρ 0 γ] < 1.4 × 10 −6 , B[B + → ρ + γ] < 2.3 × 10 −6 and B[B 0… (More)
The D 0 mixing parameter y = ∆Γ/2Γ was determined by measuring the D 0 lifetime separately for the K − π + decay mode and the K − K + decay mode with 12.4 fb −1 of data collected by the BABAR experiment in 2001. Backgrounds were suppressed with the D * → D 0 π + decay and particle identification. The following preliminary result was obtained: y = (−1.0 ±… (More)
_ _ Detector backgrounds at the Stanford Linear Collider are discussed with emphasis on their sources, and methods of controlling them.
Understanding whether the racial and ethnic gaps in political and civic participation have been closed requires a comprehensive view of citizenship, encompassing a range of activities including both civic and political acts. This paper presents such a view by constructing a composite index of engaged citizenship indicators for young adults. When multiple… (More)
The determination of the centre-of-mass energies from the LEP1 data for 1993, 1994 and 1995 is presented. Accurate knowledge of these energies is crucial in the measurement of the Z resonance parameters. The improved understanding of the LEP energy behaviour accumulated during the 1995 energy scan is detailed, while the 1993 and 1994 measurements are… (More)
A lower limit is set on the B 0 s meson oscillation parameter m s using data collected from 1991 to 1994 by the ALEPH detector. Events with a high transverse momentum lepton and a reconstructed secondary vertex are used. The high transverse momentum leptons are produced mainly by b hadron decays, and the sign of the lepton indicates the… (More)