Model-independent measurement of the e$^{{+}}$ e$^{-}$ $\rightarrow $ HZ cross section at a future e$^{{+}}$ e$^{-}$ linear collider using hadronic Z decays - INSPIRE

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Model-independent measurement of the e $^{{+}}$ e $^{-}$ $\rightarrow$ HZ cross section at a future e $^{{+}}$ e $^{-}$ linear collider using hadronic Z decays

Mark Thomson
(
- Cambridge U.
)

Sep 9, 2015

14 pages

Published in:

Eur.Phys.J.C 76 (2016) 2, 72

Published: Feb 13, 2016

e-Print:

1509.02853 [hep-ex]

DOI:

10.1140/epjc/s10052-016-3911-5

Report number:

CH-HEP-2015-07

View in:

ADS Abstract Service

reference search54 citations

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Abstract: (Springer)

A future

\mathrm{e}^{+} \mathrm{e}^{-}

collider, such as the ILC or CLIC, would allow the Higgs sector to be probed with a precision significantly beyond that achievable at the High-Luminosity LHC. A central part of the Higgs programme at an

\mathrm{e}^{+} \mathrm{e}^{-}

collider is the model-independent determination of the absolute Higgs couplings to fermions and to gauge bosons. Here the measurement of the

\mathrm{e}^{+} \mathrm{e}^{-} \rightarrow \mathrm{H} \mathrm{Z}

Higgsstrahlung cross section, using the recoil mass technique, sets the absolute scale for all Higgs coupling measurements. Previous studies have considered \upsigma (\mathrm{e}^{+} \mathrm{e}^{-} \rightarrow \mathrm{H} \mathrm{Z}) with

\mathrm{Z} \rightarrow {\ell } ^{+} {\ell } ^{-}

, where {\ell } = \mathrm{e},\,{\upmu } . In this paper it is shown for the first time that a near model-independent recoil mass technique can be extended to the hadronic decays of the

\mathrm{Z}

boson. Because the branching ratio for

\mathrm{Z} \rightarrow \mathrm{q} {\overline{\mathrm{q}}}

is approximately ten times greater than for

\mathrm{Z} \rightarrow {\ell } ^{+} {\ell } ^{-}

, this method is statistically more powerful than using the leptonic decays. For an integrated luminosity of 500

\text {fb}^{-1}

at a centre-of-mass energy of

\sqrt{s} =350~\text {GeV}

at CLIC, \upsigma (\mathrm{e}^{+} \mathrm{e}^{-} \rightarrow \mathrm{H} \mathrm{Z}) can be measured to

{\pm }1.8~\%

using the hadronic recoil mass technique. A similar precision is found for the ILC operating at

\sqrt{s} =350~\text {GeV}

. The centre-of-mass dependence of this measurement technique is discussed, arguing for the initial operation of a future linear collider at just above the top-pair production threshold.

Note:

14 pages, 10 figures

electron positron: annihilation
Higgs particle: electroproduction
Z0: associated production
mass: recoil
coupling: Higgs
Higgs particle: coupling
coupling: Yukawa
recoil: hadronic
threshold: production
Z0: hadronic decay

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