Study of CEPC performance with different collision energies and geometric layouts

Xiao, Ming; Gao, Jie; Wang, Dou; Su, Feng; Wang, Yiwei; Bai, Sha; Bian, Tianjian

doi:10.1088/1674-1137/40/8/087001

“…In a lepton collider, the initial state of each event is known accurately and high precision of measurements can be achieved. The Future Circular Collider (FCC-ee) [3] at CERN, the Circular Electron-positron Collider (CEPC) [4] in China, and the International Linear Collider (ILC) [5] are designed to produce many Higgs bosons and investigate their properties.…”

Section: Introductionmentioning

confidence: 99%

Probing Triple Higgs Self-Coupling and Effect of Beam Polarization in Lepton Colliders

Ahmed

¹

,

Nawaz

²

,

Khurshid

³

et al. 2022

Advances in High Energy Physics

0

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One of the main objectives of almost all future (lepton) colliders is to measure the self-coupling of triple Higgs in the Standard Model. By elongating the Standard Model’s scalar sector, using incipient Higgs doublet along with a quadratic (Higgs) potential can reveal many incipient features of the model and the possibility of the emergence of additional Higgs self-couplings. The self-coupling of the Higgs boson helps in reconstructing the scalar potential. The main objective of this paper is to extract Higgs self-coupling by numerically analyzing several scattering processes governed by two Higgs doublet models (2HDM). These scattering processes include various possible combinations of final states in the triple Higgs sector. The determination of production cross-section of scattering processes is carried out using two different scenarios, one with and other without polarization of incoming beam, and is extended to a center of mass energy up to s = 3 TeV . The computation is carried out in type-1 2HDM. Here, we consider the case of exact alignment limit ( s β α =1) and masses of extra Higgs states are equal, that is, m H = m H 0 = m A 0 = m H ± . This choice minimizes the oblique parameters. The decays of the final state of each process are investigated to estimate the number of events at an integrated luminosity of 1 a b − 1 and 3 a b − 1 .

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“…In lepton collider, the initial states of each event are known accurately and high precision of measurements is possible to achieve. The future circular collider (FCC-ee) [3] at CERN, the circular electron-positron collider (CEPC) [4] in china and the international linear collider (ILC) [5] is designed to produce many Higgs bosons and investigate their properties.…”

Section: Introductionmentioning

confidence: 99%

Probing triple higgs self coupling and effect of beam polarization in lepton colliders

Ahmed¹,

Nawaz²,

Khurshid³

et al. 2021

Preprint

0

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One of the main objectives of almost all future (lepton) colliders is to measure the self-coupling of triple Higgs in the Standard Model. By elongating the Standard Model's scalar sector, using incipient Higgs doublet along with a quadratic (Higgs) potential should reveal many incipient features of the model and the possibility of the emergence of additional Higgs self-couplings. The self-coupling of the Higgs boson helps in reconstructing the scalar potential. The main objective of this paper is to extract Higgs self-coupling by numerically analyzing several scattering processes governed by two Higgs doublet models (2HDM). These scattering processes include various possible combinations of final states in the triple Higgs sector. The determination of production cross-section of scattering processes is carried out using two different scenarios, with and without polarization of incoming beam and is extended to a center of mass energy up to √ s = 3 T eV . The computation is carried out in Type-1 2HDM. Here we consider the case of exact alignment limit (s βα = 1) and masses of extra Higgs state are equal that is m H = m H 0 = m A 0 = m H ± . This choice is made to minimize the oblique parameters. The decays of the final state of each process are investigated to estimate the number of events at integrated luminosity of 1ab −1 and 3ab −1 .

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“…We can easily find the four momenta from the product that will help in reconstructing the event. There are a variety of lepton colliders around the world: the Circular Electron-Positron Collider (CEPC) based in China, having beam energy of 120 GeV based in china [14][15][16], the proposed Future Circular Collider (FCC-ee) [17] by CERN [18], the International Linear Collider (ILC) with beam energy of 500 GeV extendable to 1TeV, based in Japan [19] and Compact Linear Collider (CLIC) having beam energy of 380 GeV and proposed beam energies of 1.5 and 3 TeV based in CERN [20]. All of these lepton colliders are Higgs factories which makes them the best choice to study Higgs and its properties and they can also interpret LHC results.…”

Section: Introductionmentioning

confidence: 99%

Analysis of trilinear Higgs self coupling in Two Higgs Doublet model at lepton collider

Ahmed¹,

Danish²,

Khurshid³

et al. 2021

Preprint

0

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The deduction of trilinear Higgs coupling is the main incentive behind building of future lepton colliders. The scalar sector of the Standard Model (SM) when modified by inserting another Higgs doublet and quadratic Higgs potential brings many new features into the model and as a result some extra trilinear Higgs self couplings also emerge. Reconstruction of Higgs potential relies on trilinear Higgs self-coupling which further depends upon the Higgs boson masses. In this study, computational analysis of neutral Higgs bosons h, H and A is carried out within the parameter space of Two Higgs Doublet Model (2HDM) type-I in exact alignment limit of sin (β − α) = 1 at compact linear collider. Assuming Compact Linear Collider (CLIC) scenario where the electron-positron beams will be collided at √ s = 1.5 TeV. Two different values of predicted integrated luminosities are used in our calculations, 1000 f b −1 and 2500 f b −1 . Three signal processes e + e − → Zhh → jjb bb b, e + e − → ZHH → jjb bb b and e + e − → Zhh → jjb bb b are selected for analysis. The polarized colliding beams are used to enhance the signal production cross-section. Low tan β and equal Higgs masses regime is chosen in favor of Hadronic decay of Z boson and H → b b. Different signal scenarios are selected and event generation is performed for each process separately. The W , Z bosons, and top quark backgrounds are also analyzed. Signal significance is computed at each Higgs mass hypothesis for three signal processes. After a comprehensive study, we did not find sizeable amount of signal events on top of the background but still, signal significance is found larger than 1 without taking into account the detector effects and systematics. The maximum calculated value of signal significance is observed in the range of 150 ≤ m H ≤ 250 GeV for Zhh while for ZHH the range is 175 ≤ m H ≤ 200 GeV at 1000 f b −1 and 175 ≤ m H ≤ 225 GeV region at 2500 f b −1 . Similarly, for ZAA process, the significance is highest at m A = 175 GeV for both 1000 and 2500 f b −1 .

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Study of CEPC performance with different collision energies and geometric layouts

Cited by 9 publications

References 5 publications

Probing Triple Higgs Self-Coupling and Effect of Beam Polarization in Lepton Colliders

Probing Triple Higgs Self-Coupling and Effect of Beam Polarization in Lepton Colliders

Probing triple higgs self coupling and effect of beam polarization in lepton colliders

Analysis of trilinear Higgs self coupling in Two Higgs Doublet model at lepton collider

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