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SUSY-QCD corrections in the squark-gluino sector
W. Beenakker,R. Hpker
Physics , 1996, DOI: 10.1016/S0920-5632(96)90034-1
Abstract: A status report is given of the calculations of next-to-leading-order ($N=1$) supersymmetric QCD corrections to the production of squarks and gluinos in $p\bar{p}/pp$ collisions. The implementation of these SUSY-QCD corrections leads to more stable theoretical predictions and to a substantial increase of the production cross-sections. In addition we give a discussion of the use of the $\overline{MS}$ scheme for renormalizing the coupling constants in the QCD sector of ($N=1$) supersymmetric theories.
Cross-sections for squark and gluino production at hadron colliders
R. Hpker,W. Beenakker
Physics , 1996,
Abstract: We present the cross-sections for the hadroproduction of squarks and gluinos in next-to-leading order of supersymmetric QCD. The four possible final states squark-antisquark, squark-squark, gluino-gluino and squark-gluino are analysed for the hadron colliders Tevatron and LHC. The dependence of the cross-sections on the renormalization and factorization scale is reduced significantly. The shape of the transverse-momentum and rapidity distributions remains nearly unchanged when the next-to-leading order SUSY-QCD contributions are included. The size of the corrections at the central scale, given by the average mass of the produced particles, varies between $+5\%$ and $+90\%$.
Stop decays in SUSY-QCD
W. Beenakker,R. Hpker,T. Plehn,P. M. Zerwas
Physics , 1996, DOI: 10.1007/s002880050478
Abstract: The partial widths are determined for stop decays to top quarks and gluinos, and gluino decays to stop particles and top quarks (depending on the masses of the particles involved). The widths are calculated including one-loop SUSY-QCD corrections. The radiative corrections for these strong-interaction decays are compared with the SUSY-QCD corrections for electroweak stop decays to quarks and neutralinos/charginos and top-quark decays to stops and neutralinos.
Gluon Radiation Off Scalar Stop Particles
W. Beenakker,R. Hpker,P. M. Zerwas
Physics , 1995, DOI: 10.1016/0370-2693(95)00255-J
Abstract: We present the distributions for gluon radiation off stop-antistop particles produced in $e^+e^-$ annihilation: $e^+e^- \to \tilde t \bar{\tilde t} g$. For high energies the splitting functions of the fragmentation processes $\tilde t \to \tilde t g$ and $g \to \tilde t \bar{\tilde t}$ are derived; they are universal and apply also to high-energy stop particles produced at hadron colliders.
Squark Production at the Tevatron
W. Beenakker,R. Hpker,M. Spira,P. M. Zerwas
Physics , 1994, DOI: 10.1103/PhysRevLett.74.2905
Abstract: We have determined the QCD corrections to the production of squark-antisquark pairs in $p\bar p$ collisions at the Tevatron. If the next-to-leading order corrections are taken into account, the renormalization/factorization scale dependence of the theoretical prediction for the cross section is reduced considerably. The higher order corrections increase the production cross section at the Tevatron by about a factor two if we compare the next-to-leading order prediction at a scale near the squark mass with the lowest order prediction for which, in the experimental analyses, the scale was identified with the invariant energy of the parton subprocess. This results in a rise of the experimental lower bound on the squark mass from the Tevatron by about $20$ GeV.
Gluino-Pair Production at the Tevatron
W. Beenakker,R. Hpker,M. Spira,P. M. Zerwas
Physics , 1995, DOI: 10.1007/s002880050016
Abstract: The next-to-leading order QCD corrections to the production of gluino pairs at the Tevatron are presented in this paper. Similar to the production of squark-antisquark pairs, the dependence of the cross section on the renormalization/factorization scale is reduced considerably by including the higher-order corrections. The cross section increases with respect to the lowest-order calculation which, in previous experimental analyses, had been evaluated at the scale of the invariant energy of the partonic subprocesses.
SUSY-QCD Decays of Squarks and Gluinos
W. Beenakker,R. Hpker,P. M. Zerwas
Physics , 1996, DOI: 10.1016/0370-2693(96)00379-6
Abstract: The partial widths are determined for squark decays to gluinos and quarks, and gluino decays to squarks and quarks, respectively. The widths are calculated including one-loop SUSY-QCD corrections. The corrections amount to $+$30\% to $+$50\% for squark decays and $-$10\% to $+$10\% for gluino decays. We have derived the results in the \DR ~and \MS ~renormalization schemes, and we have demonstrated explicitly that the one-loop effective $qqg$ and $q\sq\gl$ couplings are equal in the limit of exact supersymmetry.
Ichthyosis follicularis, alopecia and photophobia syndrome (IFAP): report of the first case with ocular and cutaneous manifestations in Brazil with a favorable response to treatment
Hpker, Luisa Moreira;Ribeiro, Christie Graf;Oliveira, Luciane Moreira;Moreira, Ana Tereza Ramos;
Arquivos Brasileiros de Oftalmologia , 2011, DOI: 10.1590/S0004-27492011000100013
Abstract: ichthyosis follicular, alopecia, and photophobia (ifap) syndrome is a rare disease, with possible x-linked mode of inheritance. the patient presented with ocular findings of photophobia, corneal scarring and erosions, superficial and deep corneal vascularization and myopia. he was treated with artificial tears and punctal occlusion with small improvement of photophobia. after three months using systemic retinoid (acitretina) and posterior amniotic membrane transplantation in the left eye, there was a significant improvement of photophobia, corneal erosions and neuropsychomotor development.
The Centrosomal Kinase Plk1 Localizes to the Transition Zone of Primary Cilia and Induces Phosphorylation of Nephrocystin-1
Tamina Seeger-Nukpezah, Max C. Liebau, Katja Hpker, Tobias Lamkemeyer, Thomas Benzing, Erica A. Golemis, Bernhard Schermer
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0038838
Abstract: Polo-like kinase (Plk1) plays a central role in regulating the cell cycle. Plk1-mediated phosphorylation is essential for centrosome maturation, and for numerous mitotic events. Although Plk1 localizes to multiple subcellular sites, a major site of action is the centrosomes, which supports mitotic functions in control of bipolar spindle formation. In G0 or G1 untransformed cells, the centriolar core of the centrosome differentiates into the basal body of the primary cilium. Primary cilia are antenna-like sensory organelles dynamically regulated during the cell cycle. Whether Plk1 has a role in ciliary biology has never been studied. Nephrocystin-1 (NPHP1) is a ciliary protein; loss of NPHP1 in humans causes nephronophthisis (NPH), an autosomal-recessive cystic kidney disease. We here demonstrate that Plk1 colocalizes with nephrocystin-1 to the transition zone of primary cilia in epithelial cells. Plk1 co-immunoprecipitates with NPHP1, suggesting it is part of the nephrocystin protein complex. We identified a candidate Plk1 phosphorylation motif (D/E-X-S/T-φ-X-D/E) in nephrocystin-1, and demonstrated in vitro that Plk1 phosphorylates the nephrocystin N-terminus, which includes the specific PLK1 phosphorylation motif. Further, induced disassembly of primary cilia rapidly evoked Plk1 kinase activity, while small molecule inhibition of Plk1 activity or RNAi-mediated downregulation of Plk1 limited the first and second phase of ciliary disassembly. These data identify Plk1 as a novel transition zone signaling protein, suggest a function of Plk1 in cilia dynamics, and link Plk1 to the pathogenesis of NPH and potentially other cystic kidney diseases.
On Time Reversal of Piecewise Deterministic Markov Processes
Andreas L?pker,Zbigniew Palmowski
Mathematics , 2011,
Abstract: We study the time reversal of a general PDMP. The time reversed process is defined as $X_{(T-t)-}$, where $T$ is some given time and $X_t$ is a stationary PDMP. We obtain the parameters of the reversed process, like the jump intensity and the jump measure.
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