D. M. Asner

Bio: D. M. Asner is an academic researcher from Pacific Northwest National Laboratory. The author has contributed to research in topics: Physics & Large Hadron Collider. The author has an hindex of 40, co-authored 112 publications receiving 31378 citations. Previous affiliations of D. M. Asner include Carleton University & CERN.

Radiative decays of the Υ(1S) to γπ0π0, γηη and γπ0η

Abstract: We report on a study of exclusive radiative decays of the {upsilon}(1S) resonance into the final states {gamma}{pi}{sup 0}{pi}{sup 0}, {gamma}{eta}{eta} and {gamma}{pi}{sup 0}{eta}, using 1.13 fb{sup -1} of e{sup +}e{sup -} annihilation data collected at {radical}(s)=9.46 GeV with the CLEO III detector operating at the Cornell Electron Storage Ring. In the channel {gamma}{pi}{sup 0}{pi}{sup 0}, we measure the branching ratio for the decay mode {upsilon}(1S){yields}{gamma}f{sub 2}(1270) to be (10.5{+-}1.6(stat){sub -1.8}{sup +1.9}(syst))x10{sup -5}. We place upper limits on the product branching ratios for the isoscalar resonances f{sub 0}(1500) and f{sub 0}(1710) for the {pi}{sup 0}{pi}{sup 0} and {eta}{eta} decay channels. We also set an upper limit on the {upsilon}(1S) radiative decay into {pi}{sup 0}{eta}.

Snowmass 2021 White Paper on Upgrading SuperKEKB with a Polarized Electron Beam: Discovery Potential and Proposed Implementation

Abstract: precision sin 2 independent left-right asymmetry measurements of e + e − transitions to pairs of muons, taus, and b-quarks.

Suppressed decays of D(s)(+) mesons to two pseudoscalar mesons.

Abstract: Using data collected near the ${D}_{s}^{*+}{D}_{s}^{\ensuremath{-}}$ peak production energy ${E}_{\mathrm{cm}}=4170\text{ }\text{ }\mathrm{MeV}$ by the CLEO-c detector, we study the decays of ${D}_{s}^{+}$ mesons to two pseudoscalar mesons. We report on searches for the singly Cabibbo-suppressed ${D}_{s}^{+}$ decay modes ${K}^{+}\ensuremath{\eta}$, ${K}^{+}{\ensuremath{\eta}}^{\ensuremath{'}}$, ${\ensuremath{\pi}}^{+}{K}_{S}^{0}$, ${K}^{+}{\ensuremath{\pi}}^{0}$, and the isospin-forbidden decay mode ${D}_{s}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{0}$. We normalize with respect to the Cabibbo-favored ${D}_{s}^{+}$ modes ${\ensuremath{\pi}}^{+}\ensuremath{\eta}$, ${\ensuremath{\pi}}^{+}{\ensuremath{\eta}}^{\ensuremath{'}}$, and ${K}^{+}{K}_{S}^{0}$, and obtain ratios of branching fractions: $\mathcal{B}({D}_{s}^{+}\ensuremath{\rightarrow}{K}^{+}\ensuremath{\eta})/\mathcal{B}({D}_{s}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}\ensuremath{\eta})=(8.9\ifmmode\pm\else\textpm\fi{}1.5\ifmmode\pm\else\textpm\fi{}0.4)%$, $\mathcal{B}({D}_{s}^{+}\ensuremath{\rightarrow}{K}^{+}{\ensuremath{\eta}}^{\ensuremath{'}})/\mathcal{B}({D}_{s}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\eta}}^{\ensuremath{'}})=(4.2\ifmmode\pm\else\textpm\fi{}1.3\ifmmode\pm\else\textpm\fi{}0.3)%$, $\mathcal{B}({D}_{s}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{K}_{S}^{0})/\mathcal{B}({D}_{s}^{+}\ensuremath{\rightarrow}{K}^{+}{K}_{S}^{0})=(8.2\ifmmode\pm\else\textpm\fi{}0.9\ifmmode\pm\else\textpm\fi{}0.2)%$, $\mathcal{B}({D}_{s}^{+}\ensuremath{\rightarrow}{K}^{+}{\ensuremath{\pi}}^{0})/\mathcal{B}({D}_{s}^{+}\ensuremath{\rightarrow}{K}^{+}{K}_{S}^{0})=(5.5\ifmmode\pm\else\textpm\fi{}1.3\ifmmode\pm\else\textpm\fi{}0.7)%$, and $\mathcal{B}({D}_{s}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{0})/\mathcal{B}({D}_{s}^{+}\ensuremath{\rightarrow}{K}^{+}{K}_{S}^{0})l4.1%$ at 90% C.L., where the uncertainties are statistical and systematic, respectively.

Search for the decay Ds+→ωe+ν

Abstract: We present the first search for the decay ${D}_{s}^{+}\ensuremath{\rightarrow}\ensuremath{\omega}{e}^{+}\ensuremath{ u}$ to test the four-quark content of the ${D}_{s}^{+}$ and the $\ensuremath{\omega}\mathrm{\text{\ensuremath{-}}}\ensuremath{\phi}$ mixing model for this decay. We use $586\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ of ${e}^{+}{e}^{\ensuremath{-}}$ collision data collected at a center-of-mass energy of 4170 MeV. We find no evidence of a signal, and set an upper limit on the branching fraction of $\mathcal{B}({D}_{s}^{+}\ensuremath{\rightarrow}\ensuremath{\omega}{e}^{+}\ensuremath{ u})l0.20%$ at the 90% confidence level.

Planck 2015 results - XIII. Cosmological parameters

Abstract: This paper presents cosmological results based on full-mission Planck observations of temperature and polarization anisotropies of the cosmic microwave background (CMB) radiation. Our results are in very good agreement with the 2013 analysis of the Planck nominal-mission temperature data, but with increased precision. The temperature and polarization power spectra are consistent with the standard spatially-flat 6-parameter ΛCDM cosmology with a power-law spectrum of adiabatic scalar perturbations (denoted “base ΛCDM” in this paper). From the Planck temperature data combined with Planck lensing, for this cosmology we find a Hubble constant, H0 = (67.8 ± 0.9) km s-1Mpc-1, a matter density parameter Ωm = 0.308 ± 0.012, and a tilted scalar spectral index with ns = 0.968 ± 0.006, consistent with the 2013 analysis. Note that in this abstract we quote 68% confidence limits on measured parameters and 95% upper limits on other parameters. We present the first results of polarization measurements with the Low Frequency Instrument at large angular scales. Combined with the Planck temperature and lensing data, these measurements give a reionization optical depth of τ = 0.066 ± 0.016, corresponding to a reionization redshift of . These results are consistent with those from WMAP polarization measurements cleaned for dust emission using 353-GHz polarization maps from the High Frequency Instrument. We find no evidence for any departure from base ΛCDM in the neutrino sector of the theory; for example, combining Planck observations with other astrophysical data we find Neff = 3.15 ± 0.23 for the effective number of relativistic degrees of freedom, consistent with the value Neff = 3.046 of the Standard Model of particle physics. The sum of neutrino masses is constrained to ∑ mν < 0.23 eV. The spatial curvature of our Universe is found to be very close to zero, with | ΩK | < 0.005. Adding a tensor component as a single-parameter extension to base ΛCDM we find an upper limit on the tensor-to-scalar ratio of r0.002< 0.11, consistent with the Planck 2013 results and consistent with the B-mode polarization constraints from a joint analysis of BICEP2, Keck Array, and Planck (BKP) data. Adding the BKP B-mode data to our analysis leads to a tighter constraint of r0.002 < 0.09 and disfavours inflationarymodels with a V(φ) ∝ φ2 potential. The addition of Planck polarization data leads to strong constraints on deviations from a purely adiabatic spectrum of fluctuations. We find no evidence for any contribution from isocurvature perturbations or from cosmic defects. Combining Planck data with other astrophysical data, including Type Ia supernovae, the equation of state of dark energy is constrained to w = −1.006 ± 0.045, consistent with the expected value for a cosmological constant. The standard big bang nucleosynthesis predictions for the helium and deuterium abundances for the best-fit Planck base ΛCDM cosmology are in excellent agreement with observations. We also constraints on annihilating dark matter and on possible deviations from the standard recombination history. In neither case do we find no evidence for new physics. The Planck results for base ΛCDM are in good agreement with baryon acoustic oscillation data and with the JLA sample of Type Ia supernovae. However, as in the 2013 analysis, the amplitude of the fluctuation spectrum is found to be higher than inferred from some analyses of rich cluster counts and weak gravitational lensing. We show that these tensions cannot easily be resolved with simple modifications of the base ΛCDM cosmology. Apart from these tensions, the base ΛCDM cosmology provides an excellent description of the Planck CMB observations and many other astrophysical data sets.

Phd by thesis

Abstract: Deposits of clastic carbonate-dominated (calciclastic) sedimentary slope systems in the rock record have been identified mostly as linearly-consistent carbonate apron deposits, even though most ancient clastic carbonate slope deposits fit the submarine fan systems better. Calciclastic submarine fans are consequently rarely described and are poorly understood. Subsequently, very little is known especially in mud-dominated calciclastic submarine fan systems. Presented in this study are a sedimentological core and petrographic characterisation of samples from eleven boreholes from the Lower Carboniferous of Bowland Basin (Northwest England) that reveals a >250 m thick calciturbidite complex deposited in a calciclastic submarine fan setting. Seven facies are recognised from core and thin section characterisation and are grouped into three carbonate turbidite sequences. They include: 1) Calciturbidites, comprising mostly of highto low-density, wavy-laminated bioclast-rich facies; 2) low-density densite mudstones which are characterised by planar laminated and unlaminated muddominated facies; and 3) Calcidebrites which are muddy or hyper-concentrated debrisflow deposits occurring as poorly-sorted, chaotic, mud-supported floatstones. These

The CMS experiment at the CERN LHC

Abstract: The Compact Muon Solenoid (CMS) detector is described. The detector operates at the Large Hadron Collider (LHC) at CERN. It was conceived to study proton-proton (and lead-lead) collisions at a centre-of-mass energy of 14 TeV (5.5 TeV nucleon-nucleon) and at luminosities up to 10(34)cm(-2)s(-1) (10(27)cm(-2)s(-1)). At the core of the CMS detector sits a high-magnetic-field and large-bore superconducting solenoid surrounding an all-silicon pixel and strip tracker, a lead-tungstate scintillating-crystals electromagnetic calorimeter, and a brass-scintillator sampling hadron calorimeter. The iron yoke of the flux-return is instrumented with four stations of muon detectors covering most of the 4 pi solid angle. Forward sampling calorimeters extend the pseudo-rapidity coverage to high values (vertical bar eta vertical bar <= 5) assuring very good hermeticity. The overall dimensions of the CMS detector are a length of 21.6 m, a diameter of 14.6 m and a total weight of 12500 t.