16 research outputs found
Identifying light charged Higgs boson in the channel in 2HDM Type-III
In this contribution, we discuss the light charged Higgs boson production via
at the Large Hadron Collider (LHC) in the Two-Higgs
Doublet Model (2HDM) Type-III. We explore the prospect of looking the
aforementioned Higgs boson production channel followed by signal.
The latter has the potential to be overwhelmingly stronger than
and signals in Type-III. We show that in both scenarios
standard and inverted hierarchy and after including several theoretical and
experimental constraints, the production process
followed by could represent the most promising experimental
option to search for light charged Higgs boson at the LHC.Comment: 6 pages, 2 figures, Contribution to The Tenth Annual Conference on
Large Hadron Collider Physics-LHCP202
Probing a 96 GeV Higgs Boson in the Di-Photon Channel at the LHC
Recently the CMS collaboration reported a local excess in the
di-photon spectrum at 96 GeV. The same mass range concurs with a
local excess in the invariant mass spectrum in four-jet events
collected at LEP. In this contribution we show that at 1 level the 2HDM
type-III can perfectly fit both excesses simultaneously, while satisfying all
experimental and theoretical constraints.Comment: 6 pages, 2 figures, contribution to the proceedings of the 41st
International Conference on High Energy physics - ICHEP202
The oblique parameters in the 2HDM with Vector-Like Quarks: Confronting CDF-II Anomaly
The CDF collaboration has released a new measurement of the boson mass
using their complete data set with 8.8 fb in collisions. This
result deviates from the Standard Model prediction by around 7. We
explain how the two Higgs doublet model (2HDM) with vector-like quarks is
affected by the recently discovered W boson mass. In our study, we include both
theoretical constraints such as perturbative unitarity and vacuum stability as
well as a number of experimental constraints. We also look into how the
effective mixing angle, measured by the SLD collaboration in addition to the
CDF W-boson mass, is used to determine the and parameters. In the
alignment limit, we investigate the case where the lighter CP-even neutral
Higgs boson of the 2HDM is the one found at the LHC and demonstrate how the
parameter space of the 2HDM type II in the presence of vector-like quarks is
constrained. It is found that in most cases, there is a cancellation between
the 2HDM and vector-like quarks contributions, which enlarges the parameter
space of both models.Comment: 33 pages, 12 figure
Superposition of CP-Even and CP-Odd Higgs resonances: explaining the 95 GeV excesses within a Two-Higgs Doublet Model
We propose an explanation for the observed excesses around 95 GeV in the di-photon and di-tau invariant mass distributions, as reported by the CMS collaboration at the Large Hadron Collider (LHC). These findings are complemented by a long-standing discrepancy in the bb¯ invariant mass at the Large Electron-Positron (LEP) Collider. Additionally, the ATLAS collaboration has reported a corroborative excess in the di-photon final state within the same mass range, albeit with slightly lower significance. Our approach involves the superposition of CP-even and CP-odd Higgs bosons within the Type-III Two-Higgs Doublet Model (2HDM) to simultaneously explain these excesses at 1σ Confidence Level (C.L.), while remaining consistent with current theoretical and experimental constraints
Probing light charged Higgs bosons in the 2-Higgs doublet model Type-II with vector-like quarks
We show how the presence of Vector-Like Quarks (VLQs) with quantum numbers identical to the top-quark ones alongside a Type-II 2-Higgs Doublet Model (2HDM-II) (pseudo)scalar sector can remove the stringent constraint on the mass of the charged Higgs boson H± (of some 580 GeV) emerging in such a scenario from B-physics results. We prove this to be the case for two representations of such VLQs, both a singlet and a doublet one, wherein the the lowest allowed mH± value can be 80 GeV. This is due to cancellations onsetting in b→sγ topologies between VLQ and H± contributions. Furthermore, in order to enable one to probe the regions of, as it were, this `2HDM-II+VLQ' parameter space where this mechanism is most effective, we present several results on production cross sections and decay rates involving a top-quark companion (T) with VLQ nature and the 2HDM-II Higgs bosons, chiefly the H± state, which can then guide the search for both extended Higgs and quark sectors at the Large Hadron Collider (LHC) at CERN. Specifically, we highlight the case of VLQ pair production pp→TT¯ followed by T→H±b decays, where the H± state may in turn decay into τν or tb pairs, depending on whether mH±<mt or mH±>mt, respectively
Explaining the 96 GeV Di-photon anomaly in a generic 2HDM Type-III
Motivated by results recently reported by the CMS Collaboration about an excess in the di-photon spectrum at about 96 GeV, especially when combined with another long-standing anomaly at the same value in the bb¯ invariant mass spectrum in four-jet events collected at LEP, we show that a possible explanation to both phenomena can be found at 1σ level in a generic 2-Higgs Doublet Model (2HDM) of Type-III in presence of a specific Yukawa texture, wherein Lepton Flavour Violating (LFV) (neutral) currents are induced at tree level. Bounds from Higgs data play a major role in limiting the parameter space of this scenario, yet we find solutions with m
H=125 GeV and m
h=96 GeV consistent with current theoretical and experimental bounds.
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Anatomy of Vector-Like Bottom-Quark Models in the alignment limit of the 2-Higgs Doublet Model Type-II
Expanding upon our ongoing investigation of Vector-Like Quark (VLQ) phenomenology within a 2-Higgs Doublet Model (2HDM) framework, in this paper, we complement a previous one dedicated to Vector-Like Top-quarks (VLTs) by studying Vector-Like Bottom-quarks (VLBs), specifically focusing on their behavior in the alignment limit of a Type-II Yukawa structure. We examine the potential for detecting VLBs at the Large Hadron Collider (LHC) and analyze their decay signatures, encompassing both Standard Model (SM) processes and exotic decays. The objective is to differentiate among singlet, doublet, and triplet configurations of VLBs by identifying distinct decay patterns, thereby providing insights into the structure of Beyond the SM (BSM) physics
CEPC Technical Design Report -- Accelerator
International audienceThe Circular Electron Positron Collider (CEPC) is a large scientific project initiated and hosted by China, fostered through extensive collaboration with international partners. The complex comprises four accelerators: a 30 GeV Linac, a 1.1 GeV Damping Ring, a Booster capable of achieving energies up to 180 GeV, and a Collider operating at varying energy modes (Z, W, H, and ttbar). The Linac and Damping Ring are situated on the surface, while the Booster and Collider are housed in a 100 km circumference underground tunnel, strategically accommodating future expansion with provisions for a Super Proton Proton Collider (SPPC). The CEPC primarily serves as a Higgs factory. In its baseline design with synchrotron radiation (SR) power of 30 MW per beam, it can achieve a luminosity of 5e34 /cm^2/s^1, resulting in an integrated luminosity of 13 /ab for two interaction points over a decade, producing 2.6 million Higgs bosons. Increasing the SR power to 50 MW per beam expands the CEPC's capability to generate 4.3 million Higgs bosons, facilitating precise measurements of Higgs coupling at sub-percent levels, exceeding the precision expected from the HL-LHC by an order of magnitude. This Technical Design Report (TDR) follows the Preliminary Conceptual Design Report (Pre-CDR, 2015) and the Conceptual Design Report (CDR, 2018), comprehensively detailing the machine's layout and performance, physical design and analysis, technical systems design, R&D and prototyping efforts, and associated civil engineering aspects. Additionally, it includes a cost estimate and a preliminary construction timeline, establishing a framework for forthcoming engineering design phase and site selection procedures. Construction is anticipated to begin around 2027-2028, pending government approval, with an estimated duration of 8 years. The commencement of experiments could potentially initiate in the mid-2030s
CEPC Technical Design Report -- Accelerator
International audienceThe Circular Electron Positron Collider (CEPC) is a large scientific project initiated and hosted by China, fostered through extensive collaboration with international partners. The complex comprises four accelerators: a 30 GeV Linac, a 1.1 GeV Damping Ring, a Booster capable of achieving energies up to 180 GeV, and a Collider operating at varying energy modes (Z, W, H, and ttbar). The Linac and Damping Ring are situated on the surface, while the Booster and Collider are housed in a 100 km circumference underground tunnel, strategically accommodating future expansion with provisions for a Super Proton Proton Collider (SPPC). The CEPC primarily serves as a Higgs factory. In its baseline design with synchrotron radiation (SR) power of 30 MW per beam, it can achieve a luminosity of 5e34 /cm^2/s^1, resulting in an integrated luminosity of 13 /ab for two interaction points over a decade, producing 2.6 million Higgs bosons. Increasing the SR power to 50 MW per beam expands the CEPC's capability to generate 4.3 million Higgs bosons, facilitating precise measurements of Higgs coupling at sub-percent levels, exceeding the precision expected from the HL-LHC by an order of magnitude. This Technical Design Report (TDR) follows the Preliminary Conceptual Design Report (Pre-CDR, 2015) and the Conceptual Design Report (CDR, 2018), comprehensively detailing the machine's layout and performance, physical design and analysis, technical systems design, R&D and prototyping efforts, and associated civil engineering aspects. Additionally, it includes a cost estimate and a preliminary construction timeline, establishing a framework for forthcoming engineering design phase and site selection procedures. Construction is anticipated to begin around 2027-2028, pending government approval, with an estimated duration of 8 years. The commencement of experiments could potentially initiate in the mid-2030s
CEPC Technical Design Report -- Accelerator
International audienceThe Circular Electron Positron Collider (CEPC) is a large scientific project initiated and hosted by China, fostered through extensive collaboration with international partners. The complex comprises four accelerators: a 30 GeV Linac, a 1.1 GeV Damping Ring, a Booster capable of achieving energies up to 180 GeV, and a Collider operating at varying energy modes (Z, W, H, and ttbar). The Linac and Damping Ring are situated on the surface, while the Booster and Collider are housed in a 100 km circumference underground tunnel, strategically accommodating future expansion with provisions for a Super Proton Proton Collider (SPPC). The CEPC primarily serves as a Higgs factory. In its baseline design with synchrotron radiation (SR) power of 30 MW per beam, it can achieve a luminosity of 5e34 /cm^2/s^1, resulting in an integrated luminosity of 13 /ab for two interaction points over a decade, producing 2.6 million Higgs bosons. Increasing the SR power to 50 MW per beam expands the CEPC's capability to generate 4.3 million Higgs bosons, facilitating precise measurements of Higgs coupling at sub-percent levels, exceeding the precision expected from the HL-LHC by an order of magnitude. This Technical Design Report (TDR) follows the Preliminary Conceptual Design Report (Pre-CDR, 2015) and the Conceptual Design Report (CDR, 2018), comprehensively detailing the machine's layout and performance, physical design and analysis, technical systems design, R&D and prototyping efforts, and associated civil engineering aspects. Additionally, it includes a cost estimate and a preliminary construction timeline, establishing a framework for forthcoming engineering design phase and site selection procedures. Construction is anticipated to begin around 2027-2028, pending government approval, with an estimated duration of 8 years. The commencement of experiments could potentially initiate in the mid-2030s