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A search for new phenomena in pp collisions at [Formula: see text] in final states with missing transverse momentum and at least one jet using the [Formula: see text] variable.
Eur Phys J C Part Fields
May 2017
University of Wisconsin-Madison, Madison, WI USA.
A search for new phenomena is performed in final states containing one or more jets and an imbalance in transverse momentum in pp collisions at a centre-of-mass energy of 13[Formula: see text]. The analysed data sample, recorded with the CMS detector at the CERN LHC, corresponds to an integrated luminosity of 2.3[Formula: see text].
View Article and Find Full Text PDFLikelihood analysis of the minimal AMSB model.
Eur Phys J C Part Fields
April 2017
DESY, Notkestraße 85, 22607 Hamburg, Germany.
We perform a likelihood analysis of the minimal anomaly-mediated supersymmetry-breaking (mAMSB) model using constraints from cosmology and accelerator experiments. We find that either a wino-like or a Higgsino-like neutralino LSP, [Formula: see text], may provide the cold dark matter (DM), both with similar likelihoods. The upper limit on the DM density from Planck and other experiments enforces [Formula: see text] after the inclusion of Sommerfeld enhancement in its annihilations.
View Article and Find Full Text PDFSupersymmetric Explanation of CP Violation in K→ππ Decays.
Phys Rev Lett
August 2016
Institute for Theoretical Particle Physics (TTP), Karlsruhe Institute of Technology, Wolfgang-Gaede-Straße 1, 76128 Karlsruhe, Germany.
Recent progress in the determination of hadronic matrix elements has revealed a tension between the measured value of ε_{K}^{'}/ε_{K}, which quantifies direct CP violation in K→ππ decays, and the standard-model prediction. The well-understood indirect CP violation encoded in the quantity ε_{K} typically precludes large new-physics contributions to ε_{K}^{'}/ε_{K} and challenges such an explanation of the discrepancy. We show that it is possible to cure the ε_{K}^{'}/ε_{K} anomaly in the minimal supersymmetric standard model with squark masses above 3 TeV without overshooting ε_{K}.
View Article and Find Full Text PDFConstraining light colored particles with event shapes.
Phys Rev Lett
July 2008
Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA.
Using recently developed techniques for computing event shapes with soft-collinear effective theory, CERN Large Electron Positron Collider event shape data are used to derive strong model-independent bounds on new colored particles. In the effective field theory computation, colored particles contribute in loops not only to the running of alphas but also to the running of hard, jet, and soft functions. Moreover, the differential distribution in the effective theory explicitly probes many energy scales, so even shapes have a strong sensitivity to new particle thresholds.
View Article and Find Full Text PDFBd-->phi KS CP asymmetries as an important probe of supersymmetry.
Phys Rev Lett
April 2003
Randall Laboratory, University of Michigan, Ann Arbor, Michigan 48109, USA.
The decay B(d)-->phi K(S) is a special probe of physics beyond the standard model (SM), since it has no SM tree level contribution. Motivated by recent data suggesting a deviation from the SM for its time-dependent CP asymmetry, we examine supersymmetric explanations. Chirality preserving contributions are generically small, unless gluino is relatively light.
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