scholarly journals Single production of the excited electrons in the future FCC-based lepton–hadron colliders

2018 ◽  
Vol 33 (24) ◽  
pp. 1850141 ◽  
Author(s):  
A. Caliskan ◽  
S. O. Kara
Keyword(s):  
Cross Sections ◽  
Production Cross ◽  
Center Of Mass ◽  
Hadron Colliders ◽  
Mass Limit ◽  
Final State ◽  
Signal Process ◽  
Electron Production ◽  
Single Production ◽  
Electron And Photon

We study the composite electron production at the FCC-based three electron–proton colliders with the center-of-mass energies of 3.46, 10 and 31.6 TeV. For the signal process of [Formula: see text], the production cross-sections and decay widths of the excited electrons have been calculated. The differences of some kinematical quantities of the final state particles between the signal and background have been analyzed. For this purpose, transverse momentum and pseudorapidity distributions of electron and photon have been obtained and the kinematical cuts for discovery of the excited electrons have been assigned. We have finally determined the mass limits of excited electrons for observation and discovery by applying these cuts. It is shown that the mass limit for discovery obtained from the collider with [Formula: see text] TeV (called PWFA-LC[Formula: see text]⊗[Formula: see text]FCC) is 22.3 TeV for the integrated luminosity [Formula: see text].

scholarly journals Single production of composite electrons at future SPPC-based lepton–hadron colliders

2020 ◽  
Vol 98 (4) ◽  
pp. 349-356
Author(s):  
A. Caliskan
Keyword(s):  
Cross Sections ◽  
Decay Channel ◽  
Production Cross ◽  
Statistical Significance ◽  
Center Of Mass ◽  
Final State ◽  
Exotic Particles ◽  
Composite Models ◽  
Contour Plots ◽  
Single Production

We consider the production of excited electrons with spin-1/2 at future SPPC-based electron–proton colliders with center-of-mass energies of 8.4, 11.6, 26.6, and 36.8 TeV. These exotic particles are predicted in the composite models. We calculate the production cross sections and concentrate on the photon decay channel of the excited electrons with the process of ep → e∗X → eγX. The pseudo rapidity and transverse momentum distributions of the electrons and photons in the final state have been plotted to determine the kinematical cutoffs best suited for discovery of the excited electrons. By applying these cutoffs we compute 2σ, 3σ, and 5σ contour plots of the statistical significance of the expected signal in the parameter space (L, m∗), where L denotes the integrated luminosity of the collider and m∗ is the mass of the composite electrons.

scholarly journals Search for a heavy Higgs boson decaying into two lighter Higgs bosons in the ττbb final state at 13 TeV

2021 ◽  
Vol 2021 (11) ◽  
Author(s):  
◽  
A. Tumasyan ◽  
W. Adam ◽  
J. W. Andrejkovic ◽  
T. Bergauer ◽  
...  
Keyword(s):  
Higgs Boson ◽  
Cross Section ◽  
Production Cross Section ◽  
Production Cross ◽  
Branching Fractions ◽  
Center Of Mass ◽  
Final State ◽  
Signal Process ◽  
Center Of Mass Energy ◽  
Heavy Higgs Boson

Abstract A search for a heavy Higgs boson H decaying into the observed Higgs boson h with a mass of 125 GeV and another Higgs boson hS is presented. The h and hS bosons are required to decay into a pair of tau leptons and a pair of b quarks, respectively. The search uses a sample of proton-proton collisions collected with the CMS detector at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 137 fb−1. Mass ranges of 240–3000 GeV for mH and 60–2800 GeV for $$ {m}_{{\mathrm{h}}_{\mathrm{S}}} $$ m h S are explored in the search. No signal has been observed. Model independent 95% confidence level upper limits on the product of the production cross section and the branching fractions of the signal process are set with a sensitivity ranging from 125 fb (for mH = 240 GeV) to 2.7 fb (for mH = 1000 GeV). These limits are compared to maximally allowed products of the production cross section and the branching fractions of the signal process in the next-to-minimal supersymmetric extension of the standard model.

scholarly journals Excited Muon Searches at the FCC-Based Muon-Hadron Colliders

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
A. Caliskan ◽  
S. O. Kara ◽  
A. Ozansoy
Keyword(s):  
Transverse Momentum ◽  
Cross Sections ◽  
Production Cross ◽  
Muon Decay ◽  
Hadron Colliders ◽  
Final State ◽  
Decay Widths ◽  
Muon Production ◽  
Pseudorapidity Distributions ◽  
Excited Muons

We study the excited muon production at the FCC-based muon-hadron colliders. We give the excited muon decay widths and production cross-sections. We deal with the μp→μ⋆q→μγq process and plot the transverse momentum and normalized pseudorapidity distributions of final state particles to define the kinematical cuts best suited for discovery. By using these cuts, we get the mass limits for excited muons. It is shown that the discovery limits obtained on the mass of μ⋆ are 2.2, 5.8, and 7.5 TeV for muon energies of 63, 750, and 1500 GeV, respectively.

scholarly journals Excited Neutrino Search Potential of the FCC-Based Electron-Hadron Colliders

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
A. Caliskan
Keyword(s):  
Cross Sections ◽  
Production Cross ◽  
Center Of Mass ◽  
Branching Ratios ◽  
Hadron Colliders ◽  
Production Potential ◽  
Decay Channels ◽  
Decay Widths

The production potential of the excited neutrinos at the FCC-based electron-hadron colliders, namely, the ERL60⊗FCC with s=3.46 TeV, the ILC⊗FCC with s=10 TeV, and the PWFA-LC⊗FCC with s=31.6 TeV, has been analyzed. The branching ratios of the excited neutrinos have been calculated for the different decay channels and shown that the dominant channel is ν⋆→eW+. We have calculated the production cross sections with the process of ep→ν⋆q→eW+q and the decay widths of the excited neutrinos with the process of ν⋆→eW+. The signals and corresponding backgrounds are studied in detail to obtain accessible mass limits. It is shown that the discovery limits obtained on the mass of the excited neutrino are 2452 GeV for Lint=100 fb-1, 5635 GeV for Lint=10 fb-1 (6460 GeV for Lint=100 fb-1), and 10200 GeV for Lint=1 fb-1 (13960 GeV for Lint=10 fb-1), for the center-of-mass energies of 3.46, 10, and 31.6 TeV, respectively.

scholarly journals Doubly Charged Lepton Search Potential of the FCC-Based Energy-Frontier Electron-Proton Colliders

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
A. Ozansoy
Keyword(s):  
Cross Sections ◽  
Charged Lepton ◽  
Production Cross ◽  
Statistical Significance ◽  
Center Of Mass ◽  
Final State ◽  
Composite Models ◽  
Charged Leptons ◽  
Energy Frontier ◽  
Doubly Charged

We search for the doubly charged leptons (L−−) predicted in composite models including extended weak isospin multiplets, namely, IW=1 and IW=3/2, at the Future Circular Collider- (FCC-) based energy-frontier electron-proton colliders with the center-of-mass energies of s=3.46 TeV, s=10 TeV, and s=31.6 TeV, respectively. We deal with the e−p⟶L−−X⟶e−W−X process, calculate the production cross sections, and give the normalized transverse momentum and pseudorapidity distributions of final-state electron to obtain the kinematical cuts for the discovery. We show the statistical significance (SS) of the expected signal yield as a function of doubly charged lepton mass (SS−ML plots) to attain the doubly charged lepton discovery mass limits for both the IW=1 and IW=3/2. It is obtained that discovery mass limits on the mass of doubly charged lepton for IW=1 (IW=3/2) are 2.21 2.73 TeV, 5.46 8.47 TeV, and 12.9 20.0 TeV for s=3.46 TeV, s=10 TeV, and s=31.6 TeV, respectively.

scholarly journals Collinear expansion for color singlet cross sections

2020 ◽  
Vol 2020 (9) ◽  
Author(s):  
Markus A. Ebert ◽  
Bernhard Mistlberger ◽  
Gherardo Vita
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Production Cross ◽  
Gluon Fusion ◽  
Building Blocks ◽  
Color Singlet ◽  
Final State ◽  
Beam Function ◽  
Kinematic Limit ◽  
State Radiation

Abstract We demonstrate how to efficiently expand cross sections for color-singlet production at hadron colliders around the kinematic limit of all final state radiation being collinear to one of the incoming hadrons. This expansion is systematically improvable and applicable to a large class of physical observables. We demonstrate the viability of this technique by obtaining the first two terms in the collinear expansion of the rapidity distribution of the gluon fusion Higgs boson production cross section at next-to-next-to leading order (NNLO) in QCD perturbation theory. Furthermore, we illustrate how this technique is used to extract universal building blocks of scattering cross section like the N-jettiness and transverse momentum beam function at NNLO.

Production cross-section of heavy flavored hadrons in pp collision at s = 7 TeV

2019 ◽  
Vol 34 (19) ◽  
pp. 1950150 ◽  
Author(s):  
Muhammad Ajaz ◽  
Irfan Khan ◽  
M. K. Suleymanov
Keyword(s):  
Experimental Data ◽  
Transverse Momentum ◽  
Differential Cross Section ◽  
Cross Section ◽  
Momentum Distribution ◽  
Cross Sections ◽  
Production Cross ◽  
Center Of Mass ◽  
Transverse Momentum Distribution ◽  
Mass Frame

The transverse momentum distribution of the differential production cross-sections of heavy flavored charm hadrons [Formula: see text], [Formula: see text] in pp collisions at 7 TeV are simulated. Predictions of DPMJETIII.17-1, HIJING1.383 and Sibyll2.3c are compared to the differential cross-section measurements of the LHCb experimental data presented in the region of [Formula: see text] and [Formula: see text], where the pp center of mass frame is used to measure the transverse momentum and rapidity. The models reproduce only some regions of [Formula: see text] and/or bins of [Formula: see text] but none of them predict completely all the [Formula: see text] bins over the entire [Formula: see text] range.

Signals of the first generation scalar leptoquarks at LHeC

2018 ◽  
Vol 33 (06) ◽  
pp. 1850039 ◽  
Author(s):  
Jian Zhang ◽  
Chong-Xing Yue ◽  
Zhi-Cheng Liu
Keyword(s):  
Cross Sections ◽  
First Generation ◽  
Production Cross ◽  
Numerical Results ◽  
Generation Scalar ◽  
Single Production ◽  
Scalar Leptoquarks ◽  
Near Future

We consider single production of the first generation scalar leptoquarks (SLQs) at large hadron electron collider (LHeC) in the context of two simplified SLQ models. Our numerical results show that the production cross-sections are much larger than those at LHC. The possible signals of SLQs might be discovered at LHeC in the near future.

scholarly journals Predictions for the Isolated Prompt Photon Production at the LHC ats= 13 TeV

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Muhammad Goharipour ◽  
Hossein Mehraban
Keyword(s):  
Cross Sections ◽  
Transverse Energy ◽  
Production Cross ◽  
Center Of Mass ◽  
Photon Production ◽  
Prompt Photon ◽  
Center Of Mass Energy ◽  
History Of ◽  
The Impact ◽  
Hadronic Collisions

The prompt photon production in hadronic collisions has a long history of providing information on the substructure of hadrons and testing the perturbative techniques of QCD. Some valuable information about the parton densities in the nucleon and nuclei, especially of the gluon, can also be achieved by analysing the measurements of the prompt photon production cross section whether inclusively or in association with heavy quarks or jets. In this work, we present predictions for the inclusive isolated prompt photon production in pp collisions at center-of-mass energy of 13 TeV using various modern PDF sets. The calculations are presented as a function of both photon transverse energyETγand pseudorapidityηγfor the ATLAS kinematic coverage. We also study in detail the theoretical uncertainty in the cross sections due to the variation of the renormalization, factorization, and fragmentation scales. Moreover, we introduce and calculate the ratios of photon momenta for different rapidity regions and study the impact of various input PDFs on such quantity.

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