Zobrazeno 1 - 10
of 57
pro vyhledávání: '"Oliver Witzel"'
Publikováno v:
Sensors, Vol 14, Iss 11, Pp 21497-21513 (2014)
We present a tunable diode laser spectrometer with a novel, rapid time multiplexed direct absorption- and wavelength modulation-spectroscopy operation mode. The new technique allows enhancing the precision and dynamic range of a tunable diode laser a
Externí odkaz:
https://doaj.org/article/50445378fa3a4057827205b4cb54096c
Publikováno v:
Physical Review
Nonperturbative determinations of the renormalization group (RG) $\beta$ function are crucial to understand properties of gauge-fermion systems at strong coupling and connect lattice simulations and the perturbative ultraviolet regime. Choosing well-
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::26648b789a4bf84a84714494a289196b
http://arxiv.org/abs/2209.14224
http://arxiv.org/abs/2209.14224
Autor:
Michael Marshall, Peter Boyle, Luigi Del Debbio, Felix Erben, Jonathan Flynn, Andreas Juttner, Antonin Portelli, J Tobias Tsang, Oliver Witzel
Publikováno v:
Proceedings of The 38th International Symposium on Lattice Field Theory — PoS(LATTICE2021)
We present the status of our project to calculate $D \to \pi \ell \nu$, $D \to K \ell \nu$ and $D_s \to K \ell \nu$ semileptonic form factors using domain wall fermions for both heavy and light quarks. Our computations are performed using RBC/UKQCD's
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::217024607bbbb750d6c362d48fa9ecab
http://arxiv.org/abs/2201.02680
http://arxiv.org/abs/2201.02680
Autor:
Oliver Witzel, Anna Hasenfratz, Xiao-Yong Jin, Andrew D. Gasbarro, Ethan T. Neil, Richard C. Brower, Pavlos Vranas, Enrico Rinaldi, David Schaich, James C. Osborn, G. T. Fleming, Kimmy K. Cushman, Claudio Rebbi, Graham D. Kribs
Publikováno v:
Brower, R. C.; Cushman, K.; Fleming, G. T.; Gasbarro, A.; Hasenfratz, A.; Jin, X. Y.; Kribs, G. D.; Neil, E. T.; Osborn, J. C.; Rebbi, C.; Rinaldi, E.; Schaich, D.; Vranas, P.; Witzel, O. (2021). Stealth dark matter confinement transition and gravitational waves. Physical review. D-particles, fields, gravitation, and cosmology, 103(1), 014505. American Physical Society 10.1103/PhysRevD.103.014505
PHYSICAL REVIEW D
Physical Review
PHYSICAL REVIEW D
Physical Review
We use non-perturbative lattice calculations to investigate the finite-temperature confinement transition of stealth dark matter, focusing on the regime in which this early-universe transition is first order and would generate a stochastic background
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::879740eee8e6a7660a260830355fbefa
https://boris.unibe.ch/151873/1/PhysRevD.103.014505.pdf
https://boris.unibe.ch/151873/1/PhysRevD.103.014505.pdf
Autor:
Andreas Jüttner, Jonathan M. Flynn, J. Tobias Tsang, Amarjit Soni, Oliver Witzel, Ryan C. Hill
Publikováno v:
Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020)
Flynn, J M, Hill, R C, Jüttner, A, Soni, A, Tsang, J T & Witzel, O 2021, ' Nonperturbative calculations of form factors for exclusive semileptonic B ( s ) decays ', Proceedings of Science, vol. 390, 436 . https://doi.org/10.22323/1.390.0436
Flynn, J M, Hill, R C, Jüttner, A, Soni, A, Tsang, J T & Witzel, O 2021, ' Nonperturbative calculations of form factors for exclusive semileptonic B ( s ) decays ', Proceedings of Science, vol. 390, 436 . https://doi.org/10.22323/1.390.0436
Precise theoretical predictions derived from the Standard Model are a key ingredient in searches for new physics in the flavor sector. The large mass and long lifetime of the $b$ quark make processes involving $b$ quarks of particular interest. We us
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1f5594c26938a11f85f0b7fe6a450ca5
http://arxiv.org/abs/2012.04323
http://arxiv.org/abs/2012.04323
Publikováno v:
Physical Review
We calculate the step scaling function, the lattice analog of the renormalization group $\beta$-function, for an SU(3) gauge theory with ten fundamental flavors. We present a detailed analysis including the study of systematic effects of our extensiv
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e976e11dca8815c9daf329dda1acbe72
http://arxiv.org/abs/2004.00754
http://arxiv.org/abs/2004.00754
Autor:
Oliver Witzel, Anna Hasenfratz
Publikováno v:
Physical Review
We present a real-space renormalization group transformation with continuous scale change to calculate the continuous renormalization group $\beta$ function in non-perturbative lattice simulations. Our method is motivated by the connection between Wi
Autor:
Jonathan M. Flynn, Oliver Witzel, Ryan C. Hill, Andreas Jüttner, Justus Tobias Tsang, Amarjit Soni
Publikováno v:
Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019).
We present updates for our nonperturbative lattice QCD calculations to determine semileptonic form factors for exclusive $B\to \pi\ell\nu$, $B\to D \ell\nu$, $B_s\to K\ell \nu$, and $B_s\to D_s\ell\nu$ decays. Our calculation is based on RBC-UKQCD's
Autor:
Oliver Witzel, Anna Hasenfratz
Publikováno v:
Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019).
Experimentally the existence of a light 125 GeV Higgs boson is well established but so far no other heavier resonances have been observed. Viable models to describe the Higgs boson as composite particle require hence to exhibit a large separation of
Autor:
Oliver Witzel
We present an overview of state of the art lattice quantum chromodynamcis calculations for heavy-light quantities. Special focus is given to the calculation of form factors for semi-leptonic decays of $B_{(s)}$ and $D$ mesons, the extraction of the C
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0102ba1a28fcd38f77ed9c85ecd2ec48