We analyze the uncertainties involved in obtaining the injection spectra of UHECR particles in the top-down scenario of their origin. We show that the DGLAP Q evolution of fragmentation functions (FF) to Q = MX (mass of the X particle) from their initial values at low Q is subject to considerable uncertainties. We therefore argue that, for x <∼ 0.1 (the x region of interest for most large MX va...

To overcome the attenuation due to signal distortion in telex model antenna transmitter, copper and silver coil loading materials for gain have been tested. The parameters include standing wave ratio (SWR) value≈1, impedance (ZL), return loss (RL), reflection coefficient (ρ) which measured bandwidth (BW) quality factor (Q). In this experiment a ground is used, coaxial feeder cable with 50 Ω an ...

A review of neutron form factor measurements is given. We focus on recent measurements of the neutron magnetic form factor G n M , and discuss in detail our measurements of this quantity at momentum transfers Q 2 = 0.1 − 0.6 (GeV/c) 2. In the one photon exchange approximation, the elastic electron – nucleon differential cross section is described by the so-called Rosenbluth formula 1. The expre...

dΓ dq2 (B̄ → πlν̄l) = GF |Vub| 192πmB λ(q)|f+(q)| , (2) where λ(q) = (mB + m 2 π − q) − 4mBmπ is the phase-space factor. The calculation of f+ has been the subject of numerous papers; the current state-ofthe-art methods are unquenched lattice simulations [1, 2] and QCD sum rules on the light-cone (LCSRs) [3, 4]. A particular challenge for any theoretical calculation is the prediction of the shape...

Repeat-biomarker measurement error models accounting for systematic correlated within-person error can be used to estimate the correlation coefficient (q) and deattenuation factor (k), used in measurement error correction. These models account for correlated errors in the food frequency questionnaire (FFQ) and the 24-hour diet recall and random within-person variation in the biomarkers. Failure...