Zobrazeno 1 - 10
of 67
pro vyhledávání: '"Golz, Marcel"'
We perform a model-independent analysis of $|\Delta b|=|\Delta d|=1$ processes to test the standard model and probe flavor patterns of new physics. Constraints on Wilson coefficients are obtained from global fits to $B^+ \to \pi^+ \,\mu^+\mu^-$, $B^0
Externí odkaz:
http://arxiv.org/abs/2209.04457
Rare $\vert \Delta c \vert=\vert \Delta u \vert=1$ processes uniquely probe flavor in the Standard Model and beyond from the up-type quark sector. Opportunities to search for BSM physics in charm arise from the severe GIM suppression which kills SM c
Externí odkaz:
http://arxiv.org/abs/2203.01965
We study the full angular distribution of semileptonic rare charm baryon decays in which the secondary baryon undergoes weak decay with sizable polarization parameter, $\Xi_c^+\to\Sigma^+\,(\to p\pi^0)\ell^+\ell^-$, $\Xi_c^0\to\Lambda^0\,(\to p \pi^-
Externí odkaz:
http://arxiv.org/abs/2202.02331
$SU(2)_L$-invariance links charged dilepton $\bar q\,q^\prime\,\ell^+\,\ell^-$ and dineutrino $\bar q\, q^\prime\, \bar\nu\,\nu$ couplings. This connection can be established using the Standard Model Effective Field Theory framework, and allows to pe
Externí odkaz:
http://arxiv.org/abs/2110.08795
Autor:
Golz, Marcel
Semileptonic Flavor Changing Neutral Current decays of charmed hadrons uniquely probe the up-sector of the Standard Model. Clean null test observables, such as CP-asymmetries, lepton-universality ratios, missing energy modes, lepton flavor violating
Externí odkaz:
http://arxiv.org/abs/2109.07155
Publikováno v:
JHEP 12 (2021) 061
We present a systematic global analysis of dineutrino modes $b \to q \,\nu \bar \nu$, $q=d,s$, and charged dilepton $b \to q \,\ell^+ \ell^-$ transitions. We derive improved or even entirely new limits on dineutrino branching ratios including decays
Externí odkaz:
http://arxiv.org/abs/2109.01675
We analyze rare charm baryon decays within the standard model and beyond. We identify all null test observables in unpolarized $\Lambda_c \to p \ell^+ \ell^-$, $\ell=e, \mu$ decays, and study the new physics sensitivities. We find that the longitudin
Externí odkaz:
http://arxiv.org/abs/2107.13010
Autor:
Golz, Marcel
We discuss possibilities to test physics beyond the Standard Model in $\vert\Delta c\vert=\vert\Delta u\vert= 1$ semileptonic, hadronic and missing energy decay modes. Clean null test observables such as angular observables, CP-asymmetries and lepton
Externí odkaz:
http://arxiv.org/abs/2105.03453
Autor:
Golz, Marcel
In dieser Dissertation geht es um Schwinger-parametrische Feynmanintegrale in der Quantenelektrodynamik. Mittels einer Vielzahl von Methoden aus der Kombinatorik und Graphentheorie wird eine signifikante Vereinfachung des Integranden erreicht. Nach e
Externí odkaz:
http://edoc.hu-berlin.de/18452/20572
Publikováno v:
Mod. Phys. Lett. A 36 (2021) 2130002
Rare charm decays offer the unique possibility to explore flavour-changing neutral-currents in the up-sector within the Standard Model and beyond. Due to the lack of effective methods to reliably describe its low energy dynamics, rare charm decays ha
Externí odkaz:
http://arxiv.org/abs/2011.09478