This paper, based on the invited talk at the 20th Lomonosov Conference of Elementary Particle Physics, provides short overview of the Higgs physics program at future linear colliders as Higgs ...factories.
The Compact Linear Collider (CLIC) is an option for a future
e
+
e
-
collider operating at centre-of-mass energies up to
3
TeV
, providing sensitivity to a wide range of new physics phenomena and ...precision physics measurements at the energy frontier. This paper is the first comprehensive presentation of the Higgs physics reach of CLIC operating at three energy stages:
s
=
350
GeV
, 1.4 and
3
TeV
. The initial stage of operation allows the study of Higgs boson production in Higgsstrahlung (
e
+
e
-
→
Z
H
) and
W
W
-fusion (
e
+
e
-
→
H
ν
e
ν
¯
e
), resulting in precise measurements of the production cross sections, the Higgs total decay width
Γ
H
, and model-independent determinations of the Higgs couplings. Operation at
s
>
1
TeV
provides high-statistics samples of Higgs bosons produced through
W
W
-fusion, enabling tight constraints on the Higgs boson couplings. Studies of the rarer processes
e
+
e
-
→
t
t
¯
H
and
e
+
e
-
→
H
H
ν
e
ν
¯
e
allow measurements of the top Yukawa coupling and the Higgs boson self-coupling. This paper presents detailed studies of the precision achievable with Higgs measurements at CLIC and describes the interpretation of these measurements in a global fit.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
CPV in H at 1 TeV ILC Vukašinović, N.; Agatonović-Jovin, T.; Božović-Jelisavc̆ić, I. ...
Moscow University physics bulletin,
2022/4, Letnik:
77, Številka:
2
Journal Article
Recenzirano
CP violation is one of Sakharov’s conditions for the matter-antimatter asymmetry of the Universe. The experimentally observed size of CP violation is insufficient to account for this. Is CP violated ...in the Higgs sector? Could the SM-like Higgs boson be a mixture of CP even and CP odd states of an extended Higgs sector? With what precision could such effects be measured at future electron-positron colliders? These questions will be discussed in the light of the latest studies at ILC.
Abstract
The very forward region is one of the most challenging
regions to instrument at a future
e
+
e
-
collider. At CEPC,
machine-detector interface includes, among others, a calorimeter
dedicated ...for precision measurement of the integrated luminosity at
a per mill level or better. Here we review a feasibility of such
precision, from the point of view of systematic effects arising from
luminometer mechanical precision and positioning, beam-related
requirements and physics background from two-photon processes. The
impact of the beam energy spread and its uncertainty on the
integrated luminosity precision is also discussed, as well as the
achievable beam energy spread precision with the post-CDR CEPC
beams.
Procedures for correcting the beam-beam effects in luminosity measurements at CLIC at 3 TeV center-of-mass energy are described and tested using Monte Carlo simulations. The angular counting loss due ...to the combined Beamstrahlung and initial-state radiation effects is corrected based on the reconstructed velocity of the collision frame of the Bhabha scattering. The distortion of the luminosity spectrum due to the initial-state radiation is corrected by deconvolution. At the end, the counting bias due to the finite calorimeter energy resolution is numerically corrected. To test the procedures, BHLUMI Bhabha event generator, and Guinea-Pig beam-beam simulation were used to generate the outgoing momenta of Bhabha particles in the bunch collisions at CLIC. The systematic effects of the beam-beam interaction on the luminosity measurement are corrected with precision of 1.4 permille in the upper 5% of the energy, and 2.7 permille in the range between 80 and 90% of the nominal center-of-mass energy.
Abstract
The very forward region is one of the most challenging regions to instrument at a future
e
+
e
−
collider. At CEPC, machine-detector interface includes, among others, a calorimeter
dedicated ...for precision measurement of the integrated luminosity at a per mill level or
better. Here we review a feasibility of such precision, from the point of view of systematic
effects arising from luminometer mechanical precision and positioning, beam-related requirements
and physics background from two-photon processes. The impact of the beam energy spread and its
uncertainty on the integrated luminosity precision is also discussed, as well as the achievable
beam energy spread precision with the post-CDR CEPC beams.
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