0000000000601824

AUTHOR

Seungwon Baek

showing 4 related works from this author

Measurements of new physics in B -> pi pi decays

2005

If new physics (NP) is present in B -> pi pi decays, it can affect the isospin I=2 or I=0 channels. In this paper, we discuss various methods for detecting and measuring this NP. The techniques have increasing amounts of theoretical hadronic input. If NP is eventually detected in B -> pi pi -- there is no evidence for it at present -- one will be able to distinguish I=2 and I=0, and measure its parameters, using these methods.

High Energy Physics - PhenomenologyFísica
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Measurements of new physics inB→ππdecays

2005

If new physics (NP) is present in B{yields}{pi}{pi} decays, it can affect the isospin I=2 or I=0 channels. In this paper, we discuss various methods for detecting and measuring this NP. The techniques have increasing amounts of theoretical hadronic input. If NP is eventually detected in B{yields}{pi}{pi}--there is no evidence for it at present--one will be able to distinguish I=2 and I=0, and measure its parameters, using these methods.

PhysicsNuclear and High Energy PhysicsParticle physics010308 nuclear & particles physicsPhysics beyond the Standard ModelHadronMeasure (physics)01 natural sciencesNuclear physicsPionIsospin0103 physical sciencesB meson010306 general physicsPhysical Review D
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Beyond the dark matter effective field theory and a simplified model approach at colliders

2016

Direct detection of and LHC search for the singlet fermion dark matter (SFDM) model with Higgs portal interaction are considered in a renormalizable model where the full Standard Model (SM) gauge symmetry is imposed by introducing a singlet scalar messenger. In this model, direct detection is described by an effective operator m_q \bar{q} q \bar{\chi} \chi as usual, but the full amplitude for monojet + \not E_T involves two intermediate scalar propagators, which cannot be seen within the effective field theory (EFT) or in the simplified model without the full SM gauge symmetry. We derive the collider bounds from the ATLAS monojet + \not E_T as well as the CMS t\bar{t} + \not E_T data, findi…

PhysicsNuclear and High Energy PhysicsParticle physicsUnitarity010308 nuclear & particles physicsPhysics beyond the Standard ModelHigh Energy Physics::LatticeScalar (mathematics)High Energy Physics::PhenomenologyPropagatorFOS: Physical sciences01 natural scienceslcsh:QC1-999High Energy Physics - ExperimentHigh Energy Physics - PhenomenologyHigh Energy Physics - Experiment (hep-ex)High Energy Physics - Phenomenology (hep-ph)0103 physical sciencesEffective field theoryHiggs bosonHigh Energy Physics::ExperimentGauge theory010306 general physicslcsh:PhysicsGauge symmetryPhysics Letters B
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Can one detect new physics in I=0 and/or I=2 contributions to the decays B ->pi pi

2005

We study the effects of new-physics contributions to B --> pi pi decays, which can be parametrized as four new complex quantities. A simple analysis is provided by utilizing the reparametrization invariance of the decay amplitudes. We find that six quantities can be reabsorbed into the definitions of Standard Model-like parameters. As a result, the usual isospin analysis provides only two constraints on new physics which are independent of estimates for the Standard Model contributions. In particular, we show that one is not sensitive to new physics affecting the I=0 amplitudes. On the other hand, I=2 new physics can be detected, and its parameters can be measured by using independent deter…

High Energy Physics - PhenomenologyFísicaComputer Science::Databases
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