Single top production as a probe of heavy resonances

Drueke, Elizabeth; Nutter, Joseph; Schwienhorst, R.; Vignaroli, Natascia; Walker, Devin G. E.; Yu, Jiang-Hao

doi:10.1103/physrevd.91.054020

Cited by 17 publications

(21 citation statements)

References 48 publications

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“…In our calculation, the width of the Higgs boson is necessary only for regulating the integrable singularity of the s-channel Higgs boson that can be present in one-loop diagrams. The value of G µ is set equal to 8) and the CKM matrix is set equal to the 3×3 identity matrix. We renormalise QCD interactions in the MS scheme and, as already mentioned, we use the 5FS.…”

Section: Input Parametersmentioning

confidence: 99%

“…[38] and [39]. These calculations used different input parameters 8 and applied different cuts than those specified in Sec. 3.1.…”

Section: −10%mentioning

confidence: 99%

“…Within the SM the interest in single-top production is mainly motivated by the possibility of directly extracting the value of |V tb | in the CKM matrix element [1][2][3][4][5]. Moreover, in numerous BSM scenarios, single-top production provides a sensitive probe to New Physics effects [6][7][8][9][10][11][12][13][14][15][16], possibly parametrised through dimension-6 operators [14][15][16][17][18]. Indeed, involving the heaviest of the SM particles and EW interactions, this class of processes is of paramount interest for physics beyond-the-SM (BSM).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Precise predictions for single-top production: the impact of EW corrections and QCD shower on the t-channel signature

Frederix

Pagani

Tsinikos

2019

J. High Energ. Phys.

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In this work we calculate and provide precise predictions for the signature that is typically exploited at the LHC for the measurement of t-channel single-top production: 1 lepton, 1 light jet, 1 b-jet, / E T and no additional jets or leptons. We apply the cuts that define the fiducial region and we take into account all the contributions to this signature; not only those from resonant t-channel single-top production. On the one hand, we calculate the complete-NLO corrections, i.e., all NLO effects of QCD and EW origin. On the other hand, we study in detail the impact of a QCD parton shower for the fiducial region we consider. We provide predictions in different approximations at the inclusive level and for several differential distributions. Our study demonstrates the relevance of both EW corrections and shower effects for obtaining precise and reliable theoretical predictions for the single-top-production fiducial region.

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Section: Input Parametersmentioning

confidence: 99%

“…[38] and [39]. These calculations used different input parameters 8 and applied different cuts than those specified in Sec. 3.1.…”

Section: −10%mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Precise predictions for single-top production: the impact of EW corrections and QCD shower on the t-channel signature

Frederix

Pagani

Tsinikos

2019

J. High Energ. Phys.

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“…While formally suppressed in SMEFT, the couplings V R and g L are relevant for the study of new charged vector currents (W bosons) or scalars (H ± bosons) [93][94][95] and are strongly constrained experimentally despite their suppression. This is possible due to the strong spin correlations in single-top-quark production, and a large set of observables highly sensitive to SM deviations.…”

Section: Setup and Calculationmentioning

confidence: 99%

Off-shell single-top-quark production in the Standard Model Effective Field Theory

Neumann

Sullivan

2019

J. High Energ. Phys.

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We present a fully differential and spin-dependent t-channel single-top-quark calculation at next-to-leading order (NLO) in QCD including off-shell effects by using the complex mass scheme in the Standard Model (SM) and in the Standard Model Effective Field Theory (SMEFT). We include all relevant SMEFT operators at 1/Λ 2 that contribute at NLO in QCD for a fully consistent comparison to the SM at NLO. In addition, we include chirality flipping operators that do not interfere with the SM amplitude and contribute only at 1/Λ 4 with a massless b-quark. Such higher order effects are usually captured by considering anomalous right-handed W tb and left-handed W tb tensor couplings. Despite their formal suppression in the SMEFT, they describe an important class of models for new physics. Our calculation and analysis framework is publicly available in MCFM.

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“…To explore the effect of topology on HHG, recent works 29,30 have employed the SSH tight-binding model and its analogue in more rigorous time-dependent density functional theory (TDDFT) simulations of atomic chains, predicting improved harmonic yields associated with the topolotical insulator (TI) phases for sub-band-gap photon energies that are robust under distortions, continuous phase transitions, and choice of on-site potentials. 31 In a related study, 32 the transition from atomic-like systems to solid-state bulk materials was analyzed in the context of HHG, emphasizing the evolution in cutoff energy as the chain length increases, and concluding that a chain of six atoms constitutes the optimal length for this transition to occur as a consequence of changes in the state density.…”

Section: Introductionmentioning

confidence: 99%

Strong-field-driven dynamics and high-harmonic generation in interacting 1D systems (Conference Presentation)

Vega¹,

Cox²,

Sols³

et al. 2019

Low-Dimensional Materials and Devices 2019

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The observation of high-order harmonic generation (HHG) from bulk crystals is stimulating substantial efforts to understand the involved mechanisms and their analogue to the intuitive three-step recollision model of gas phase HHG. On the technological side, efficient solid-state HHG is anticipated to enable compact attosecond and ultraviolet light sources that could unveil electron dynamics in chemical reactions and provide sharper tomographic imaging of molecular orbitals. Here we explore the roles of electronic band structure and Coulomb interactions in solid-state HHG by studying the optical response of linear atomic chains and carbon nanotubes to intense ultrashort pulses. Specifically, we simulate electron dynamics by solving the single-particle density matrix equation of motion in the presence of intense ultrafast optical fields, incorporating tight-binding electronic states and a self-consistent electron-electron interaction. While linear atomic chains constitute an idealized system, our realistic 1D model readily provides insight on the temporal evolution of electronic states in reciprocal space, both in the absence or presence of electron interactions, which we demonstrate to play an important role in the HHG yield. This model further predicts that doped semiconductors generate high harmonics more efficiently than their metallic and undoped counterparts. To complement this idealized system we also show results for HHG in more realistic quasi-1D structures such as carbon nanotubes, the behavior of which is found to be in good qualitative agreement with the atomic chains. Our findings apply directly to extreme nonlinear optical phenomena in atoms on surfaces, carbon-based structures, linear arrays of dopant atoms in semiconductors, and linear molecules, such as polycyclic aromatic hydrocarbon chains, and can be straightforwardly extended to optimize existing platforms for HHG or identify new solid-state alternatives in the context of nonlinear plasmonics.

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Single top production as a probe of heavy resonances

Cited by 17 publications

References 48 publications

Precise predictions for single-top production: the impact of EW corrections and QCD shower on the t-channel signature

Precise predictions for single-top production: the impact of EW corrections and QCD shower on the t-channel signature

Off-shell single-top-quark production in the Standard Model Effective Field Theory

Strong-field-driven dynamics and high-harmonic generation in interacting 1D systems (Conference Presentation)

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