Stony Brook University

About: Stony Brook University is a education organization based out in Stony Brook, New York, United States. It is known for research contribution in the topics: Population & Poison control. The organization has 32534 authors who have published 68218 publications receiving 3035131 citations. The organization is also known as: State University of New York at Stony Brook & SUNY Stony Brook.

QCD corrections to heavy-quark production in p p ¯ collisions

Abstract: We investigate QCD corrections to the cross section and differential distributions for $p+\overline{p}\ensuremath{\rightarrow}Q+\overline{Q}+X$, where $Q$ and $\overline{Q}$ are heavy quarks. We calculate the order-${\ensuremath{\alpha}}_{s}$ corrections to the parton reaction $g+g\ensuremath{\rightarrow}Q+\overline{Q}$. At the quark level this involves the computation of the virtualgluon contributions to the reactions $g+g\ensuremath{\rightarrow}Q+\overline{Q}$, and the soft and hard contributions from the reaction $g+g\ensuremath{\rightarrow}Q+\overline{Q}+g$. Results are given for the cross section and differential distributions for the range of $p\overline{p}$ collision energies available at CERN and Fermilab. A comparison is made with the recent data from the UA1 Collaboration.

The Effect of Sterol Structure on Membrane Lipid Domains Reveals How Cholesterol Can Induce Lipid Domain Formation

Abstract: Detergent-insoluble membrane domains, enriched in saturated lipids and cholesterol, have been implicated in numerous biological functions. To understand how cholesterol promotes domain formation, the effect of various sterols and sterol derivatives on domain formation in mixtures of the saturated lipid dipalmitoylphosphatidylcholine (DPPC) and a fluorescence quenching analogue of an unsaturated lipid was compared. Quenching measurements demonstrated that several sterols (cholesterol, dihydrocholesterol, epicholesterol, and 25-hydroxycholesterol) promote formation of DPPC-enriched domains. Other sterols and sterol derivatives had little effect on domain formation (cholestane and lanosterol) or, surprisingly, strongly inhibit it (coprostanol, androstenol, cholesterol sulfate, and 4-cholestenone). The effect of sterols on domain formation was closely correlated with their effects on DPPC insolubility. Those sterols that promoted domain formation increased DPPC insolubility, whereas those sterols that inhibit...

Quantum Spin Chain, Toeplitz Determinants and the Fisher—Hartwig Conjecture

Abstract: We consider the one-dimensional quantum spin chain, which is called the XX model (XX0 model or isotropic XY model) in a transverse magnetic field. We are mainly interested in the entropy of a block of Lneighboring spins at zero temperature and of an infinite system. We represent the entropy in terms of a Toeplitz determinant and calculate the asymptotic analytically. We derive the first two terms of the asymptotic decomposition. Interestingly, these two terms of decomposition clearly show a length scale related to the field h.

Performance of the ATLAS trigger system in 2015

Abstract: During 2015 the ATLAS experiment recorded 3.8 fb(-1) of proton-proton collision data at a centre-of-mass energy of 13 TeV. The ATLAS trigger system is a crucial component of the experiment, respons ...