Quantum effects on Higgs-strahlung events at linear colliders within the general two-Higgs-doublet model

Journal Article · Tue Jun 01 00:00:00 EDT 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.81.113005· OSTI ID:21407941

Lopez-Val, David; Sola, Joan; Bernal, Nicolas ^[1]

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1. High Energy Physics Group, Departament ECM, and Institut de Ciencies del Cosmos, Universitat de Barcelona, Avinguda Diagonal 647, E-08028 Barcelona, Catalonia (Spain)

The associated production of neutral Higgs bosons with the Z{sup 0} gauge boson (h{sup 0}Z{sup 0}, H{sup 0}Z{sup 0}) is investigated in the context of the future linear colliders, such as the ILC and CLIC, within the general two-Higgs-doublet model (2HDM). We compute the corresponding cross section for the processes e{sup +}e{sup -{yields}}Z{sup 0}h{sup 0}/Z{sup 0}H{sup 0} at one-loop, including the full set of corrections at O({alpha}{sub ew}{sup 3}) together with the leading O({alpha}{sub ew}{sup 4}) terms, in full consistency with the available theoretical and phenomenological constraints. We find that the wave-function corrections to the external Higgs fields are the dominant source of the quantum effects, which turn out to be large and negative (e.g., {delta}{sigma}/{sigma}{approx}-20%/-60%) in all the {radical}(s) range, and located predominantly in the region around tan{beta}{approx}1 and moderate values of the parameter {lambda}{sub 5} (being {lambda}{sub 5}<0). This behavior can be ultimately traced back to the enhancement potential of the triple Higgs-boson self-couplings, a trademark feature of the 2HDM with no counterpart in the Higgs sector of the minimal supersymmetric standard model. Even under this substantial depletion of the one-loop-corrected signal (which is also highly distinctive with respect to the SM expectation for e{sup +}e{sup -{yields}}Z{sup 0}H), the predicted Higgs-strahlung rates comfortably reach a few tens of femtobarn, which means barely {approx}10{sup 3}-10{sup 4} events per 500 fb{sup -1} of integrated luminosity. Because of their great complementarity, we argue that the combined analysis of the Higgs-strahlung events (h{sup 0}Z{sup 0}, H{sup 0}Z{sup 0}) and the previously computed one-loop Higgs-pair production processes (H{sup 0}A{sup 0}) could be instrumental to probe the structure of the Higgs sector at future linac facilities.

• OSTI ID: 21407941
• Journal Information: Physical Review. D, Particles Fields, Vol. 81, Issue 11; Other Information: DOI: 10.1103/PhysRevD.81.113005; (c) 2010 The American Physical Society; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CORRECTIONS
CROSS SECTIONS
ELECTRON-POSITRON COLLISIONS
HIGGS BOSONS
HIGGS MODEL
LINEAR COLLIDERS
LUMINOSITY
PAIR PRODUCTION
POTENTIALS
STANDARD MODEL
SUPERSYMMETRY
WAVE FUNCTIONS
Z NEUTRAL BOSONS
ACCELERATORS
BOSONS
COLLISIONS
ELECTRON COLLISIONS
ELEMENTARY PARTICLES
FIELD THEORIES
FUNCTIONS
GRAND UNIFIED THEORY
INTERACTIONS
INTERMEDIATE BOSONS
INTERMEDIATE VECTOR BOSONS
LINEAR ACCELERATORS
MATHEMATICAL MODELS
OPTICAL PROPERTIES
PARTICLE MODELS
PARTICLE PRODUCTION
PHYSICAL PROPERTIES
POSITRON COLLISIONS
POSTULATED PARTICLES
QUANTUM FIELD THEORY
SYMMETRY
UNIFIED GAUGE MODELS