Correlated decays of pair-produced scalar taus

Hagiwara, Kaoru; Mawatari, Kentarou; Rainwater, D.; Stelzer, T.

doi:10.1103/physrevd.73.075010

Cited by 11 publications

(11 citation statements)

References 24 publications

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“…3 A brief description of AMEGIC++ within the SHERPA framework can be found in [54], whereas a full documentation of the (partly obsolete) version 1.0 is given in [3] with some extensions and results discussed in [55][56][57]. An update on the helicity formalism as it is used in the current version is documented in [55].…”

Section: Amplitudesmentioning

confidence: 99%

Automating dipole subtraction for QCD NLO calculations

2007

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Abstract. In this publication the construction of an automatic algorithm to subtract infrared divergences in real QCD corrections through the Catani-Seymour dipole subtraction method [1, 2] is reported. The resulting computer code has been implemented in the matrix element generator AMEGIC++ [3]. This will allow for the automatic generation of dipole subtraction terms and their integrals over the one-parton emission phase space for any given process. If the virtual matrix element is provided as well, this then directly leads to an NLO QCD parton level event generator.

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Section: Amplitudesmentioning

confidence: 99%

Automating dipole subtraction for QCD NLO calculations

2007

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“…Nevertheless, it is expected to be insubstantial quantitatively whether the particle is self-conjugate or not, unless the width of the parent particle P ± is very large and there exist large chirality mixing contributions [77]. So, any interference effects due to the charge self-conjugateness of the invisible particle will be ignored in the present work.…”

Section: Introductionmentioning

confidence: 97%

Spin and chirality effects in antler-topology processes at high energy $$\varvec{e^+e^-}$$ colliders

et al. 2015

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We perform a model-independent investigation of spin and chirality correlation effects in the antler-topology processes e + e − → P + P − → ( + D 0 )( −D0 ) at highenergy e + e − colliders with polarized beams. Generally the production process e + e − → P + P − can occur not only through the s-channel exchange of vector bosons, V 0 , including the neutral Standard Model (SM) gauge bosons, γ and Z , but also through the s-and t-channel exchanges of new neutral states, S 0 and T 0 , and the u-channel exchange of new doubly charged states, U −− . The general set of (nonchiral) three-point couplings of the new particles and leptons allowed in a renormalizable quantum field theory is considered. The general spin and chirality analysis is based on the threshold behavior of the excitation curves for P + P − pair production in e + e − collisions with longitudinal-and transverse-polarized beams, the angular distributions in the production process and also the production-decay angular correlations. In the first step, we present the observables in the helicity formalism. Subsequently, we show how a set of observables can be designed for determining the spins and chiral structures of the new particles without any model assumptions. Finally, taking into account a typical set of approximately chiral invariant scenarios, we demonstrate how the spin and chirality effects can be probed experimentally at a high-energy e + e − collider.

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“…for the ρ resonance in QCD or a corresponding resonance in composite models, (2) if the masses of mother and daughter particle are near-degenerate, m ∼ M (decay threshold), e.g. typically in UED, (3) if the mass of the intermediate is close to the kinematical limit of the experiment, M ∼ √ s (particle threshold), (4) if there are big interferences between different exclusive decay channels (quasi-combinatorial background), and finally (5) if there is a propagator non-separable from the matrix element (e.g. in the case of a non-trivial spectral density of particles or unparticles).…”

Section: Introduction and Finite Width Effectsmentioning

confidence: 99%

“…e.g. [3,4]. Though there have been systematic improvements of the NWA [5,6] up to the order O(Γ/M ), it is always preferrable to use full matrix elements for the processes under investigation.…”

Section: Introduction and Finite Width Effectsmentioning

confidence: 99%

A fat gluino in disguise

Reuter¹,

Wiesler²

2013

Eur. Phys. J. C

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In this paper, we investigate how a sizeable width-to-mass ratio for a gluino, as is for example realized in GMSB scenarios, could affect the discovery potential of gluinos at the LHC. More importantly, the influence of the gluino being "fat" on the standard mass and spin determination methods at the LHC are investigated. For this purpose, we focus on gluino production at the LHC, where we do not factorize the first step in the gluino decay cascade, but treat the following decay cascades step in factorization, including full spin correlations. The effects of sizeable width-to-mass ratios from a few up to 15-20 per cent on the endpoint of several mass determination methods as well as on means for discrimination between BSM spin paradigms like SUSY and UED are studied.

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Correlated decays of pair-produced scalar taus

Cited by 11 publications

References 24 publications

Automating dipole subtraction for QCD NLO calculations

Automating dipole subtraction for QCD NLO calculations

Spin and chirality effects in antler-topology processes at high energy $$\varvec{e^+e^-}$$ colliders

A fat gluino in disguise

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