TauDecay: a library to simulate polarized tau decays via FeynRules and MadGraph5

Hagiwara, Kaoru; Li, Tong; Mawatari, Kentarou; Nakamura, Junya

doi:10.1140/epjc/s10052-013-2489-4

Cited by 46 publications

(39 citation statements)

References 65 publications

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“…There are mainly four decay modes for di-tau, namely, τ e τ µ (6%), τ e τ h (23%), τ µ τ h (23%), and τ h τ h (42%), where h denotes a hadron. In this analysis, we use the TauDecay package [61] to model the relatively clean leptonic and semi-leptonic decay modes of the taus. The main backgrounds for τ e τ µ are tt, W W , and DY.…”

Section: Case C: τ Final Statesmentioning

confidence: 99%

Nonstandard neutrino interactions at COHERENT, DUNE, T2HK and LHC

Han

Liao

Liu

et al. 2019

J. High Energ. Phys.

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We study how nonstandard neutrino interactions (NSI) may be probed by a combination of coherent elastic neutrino-nucleus scattering, neutrino oscillation and collider data, from COHERENT, DUNE, T2HK and the high-luminosity (HL) LHC. We focus on NSI induced by a new flavored gauge boson Z in a generic anomaly-free ultraviolet-complete model. For Z masses above 10 GeV, the HL-LHC has the best sensitivity regardless of the flavor structure of the model. For masses between 0.01 GeV−10 GeV, current LHCb data and future COHERENT data have the best sensitivity unless the Z couplings to the first and second generation leptons are suppressed, in which case DUNE and T2HK have the best sensitivity. For Z masses between about 5 MeV−20 MeV, DUNE and T2HK have the best sensitivity. We also show how joint analyses of COHERENT and LHC data may constrain such models.

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Section: Case C: τ Final Statesmentioning

confidence: 99%

Nonstandard neutrino interactions at COHERENT, DUNE, T2HK and LHC

Han

Liao

Liu

et al. 2019

J. High Energ. Phys.

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“…Using MadGraph5 aMC@NLO [18] with the TauDecay package [19], we generate parton-level events for the process (charged-conjugated process is also considered),…”

Section: Monte Carlo Event Generation and Selection Cutsmentioning

confidence: 99%

Determining the strong phase of the a1 meson decay amplitude using the W→ντ(→ν
Hagiwara
¹
,
Ishida
²
,
Yamada
³

et al. 2020
Phys. Rev. D
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To measure the helicity of a spin-1 meson from the triple vector product of the threemomenta of its decay products, one needs information about the strong phase of the decay amplitude. In this paper, taking a 1 (1260) meson as an example, we present a method to extract information about the strong phase from the triple vector product of the pion momenta in W → ντ (→ νa 1 (→ π ∓ π ∓ π ± )) process, where the a 1 helicity is known a priori from electroweak theory. This process is advantageous in that highly-boosted a − 1 mesons from τ − L decays have nearly maximal helicity asymmetry and thus most reflect the strong phase. We revisit the theoretical calculation of the a 1 meson helicity in W → ντ (→ νa 1 ) process. We formulate the differential decay rate of polarized a 1 mesons in a manner convenient for the study of the a 1 meson helicity asymmetry. Finally, we present the method for extracting information about the strong phase, and assess its feasibility at the LHC.The helicity of spin-1 mesons can be a probe for physics beyond the Standard Model (SM). For example, in B − → K − π − π + γ process induced by b → sγ, the SM predicts that the K − π − π + system is mostly left-handed because W boson loop gives an amplitude with a left-handed photon, while various extensions of the SM contain an extra amplitude with a right-handed photon. The helicity of the K − π − π + system can be determined from the triple vector product of the three-momenta of K − , π − , π + , and indeed a non-zero polarization of the system has been confirmed experimentally [1]. Nevertheless, the helicity has not been measured. The difficulty lies in the fact that the triple vector product of three-momenta is a naïve T-odd quantity [2] (odd under the reversal of all three-momenta and spins), and in CP-conserving theories like

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“…The predictions for BRðμ → eγÞ and BRðμ → 3eÞ lie in the range where the recent and near future experiment can probe. Our scenario can be precisely illuminated by combining LFV observables and unique collider signals [94][95][96][97][98][99][100]. It should be emphasized that when we consider the [92] not yet observed CLFV.…”

Section: B Predictions For Charged Lfvmentioning

confidence: 99%

Big-bang nucleosynthesis and leptogenesis in the CMSSM

et al. 2018

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We have studied the constrained minimal supersymmetric standard model with three right-handed neutrinos, and investigated whether there still is a parameter region consistent with all experimental data/ limits such as the baryon asymmetry of the Universe, the dark matter abundance and the lithium primordial abundance. Using Casas-Ibarra parametrization, we have found a very narrow parameter space of the complex orthogonal matrix elements where the lightest slepton can have a long lifetime, which is necessary for solving the lithium problem. We have studied three cases of the right-handed neutrino mass ratioWe have obtained the mass range of the lightest right-handed neutrino that lies between 10 9 and 10 11 GeV. The important result is that its upper limit is derived by solving the lithium problem and the lower limit comes from leptogenesis. Lepton flavor violating decays such as μ → eγ in our scenario are in the reach of MEG-II and Mu3e.

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TauDecay: a library to simulate polarized tau decays via FeynRules and MadGraph5

Cited by 46 publications

References 65 publications

Nonstandard neutrino interactions at COHERENT, DUNE, T2HK and LHC

Nonstandard neutrino interactions at COHERENT, DUNE, T2HK and LHC

Determining the strong phase of the a1 meson decay amplitude using the W→ντ(→ν
Hagiwara
¹
,
Ishida
²
,
Yamada
³

et al. 2020
Phys. Rev. D
Self Cite
0
0
0
0
View full text Add to dashboard Cite

Big-bang nucleosynthesis and leptogenesis in the CMSSM

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TauDecay: a library to simulate polarized tau decays via FeynRules and MadGraph5

Cited by 46 publications

References 65 publications

Nonstandard neutrino interactions at COHERENT, DUNE, T2HK and LHC

Nonstandard neutrino interactions at COHERENT, DUNE, T2HK and LHC

Determining the strong phase of the a1 meson decay amplitude using the W→ντ(→νHagiwara1, Ishida2, Yamada3 et al. 2020Phys. Rev. DSelf Cite0000View full textAdd to dashboardCite

Big-bang nucleosynthesis and leptogenesis in the CMSSM

Contact Info

Product

Resources

About

Determining the strong phase of the a1 meson decay amplitude using the W→ντ(→ν
Hagiwara
¹
,
Ishida
²
,
Yamada
³

et al. 2020
Phys. Rev. D
Self Cite
0
0
0
0
View full text Add to dashboard Cite