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 Search for pair production of third-generation scalar leptoquarks decaying into a top quark and a τ-lepton in pp collisions at $$ \sqrt{s} $$ = 13 TeV with the ATLAS detector

2021 ◽  
Vol 2021 (6) ◽  
Author(s):  
◽  
G. Aad ◽  
B. Abbott ◽  
D. C. Abbott ◽  
A. Abed Abud ◽  
...  
Keyword(s):  
Pair Production ◽  
Top Quark ◽  
Production Cross ◽  
Branching Fraction ◽  
Hadron Collider ◽  
Atlas Detector ◽  
Third Generation ◽  
Final State ◽  
Generation Scalar ◽  
Scalar Leptoquarks

Abstract A search for pair production of third-generation scalar leptoquarks decaying into a top quark and a τ-lepton is presented. The search is based on a dataset of pp collisions at $$ \sqrt{s} $$ s = 13 TeV recorded with the ATLAS detector during Run 2 of the Large Hadron Collider, corresponding to an integrated luminosity of 139 fb−1. Events are selected if they have one light lepton (electron or muon) and at least one hadronically decaying τ -lepton, or at least two light leptons. In addition, two or more jets, at least one of which must be identified as containing b-hadrons, are required. Six final states, defined by the multiplicity and flavour of lepton candidates, are considered in the analysis. Each of them is split into multiple event categories to simultaneously search for the signal and constrain several leading backgrounds. The signal-rich event categories require at least one hadronically decaying τ-lepton candidate and exploit the presence of energetic final-state objects, which is characteristic of signal events. No significant excess above the Standard Model expectation is observed in any of the considered event categories, and 95% CL upper limits are set on the production cross section as a function of the leptoquark mass, for different assumptions about the branching fractions into tτ and bν. Scalar leptoquarks decaying exclusively into tτ are excluded up to masses of 1.43 TeV while, for a branching fraction of 50% into tτ, the lower mass limit is 1.22 TeV.

scholarly journals Search for first-generation scalar leptoquarks inpp¯collisions ats=1.96  TeV

2005 ◽  
Vol 71 (7) ◽  
Author(s):  
V. M. Abazov ◽  
B. Abbott ◽  
M. Abolins ◽  
B. S. Acharya ◽  
M. Adams ◽  
...  
Keyword(s):  
First Generation ◽  
Generation Scalar ◽  
Scalar Leptoquarks

scholarly journals Search for first generation scalar leptoquarks in pp collisions at s=7 TeV with the ATLAS detector

2012 ◽  
Vol 709 (3) ◽  
pp. 158-176 ◽  
Author(s):  
G. Aad ◽  
B. Abbott ◽  
J. Abdallah ◽  
A.A. Abdelalim ◽  
A. Abdesselam ◽  
...  
Keyword(s):  
First Generation ◽  
Atlas Detector ◽  
Pp Collisions ◽  
Generation Scalar ◽  
Scalar Leptoquarks

scholarly journals Search for first generation scalar leptoquarks in the eνjj channel in pp collisions at s=7 TeV

2011 ◽  
Vol 703 (3) ◽  
pp. 246-266 ◽  
Author(s):  
S. Chatrchyan ◽  
V. Khachatryan ◽  
A.M. Sirunyan ◽  
A. Tumasyan ◽  
W. Adam ◽  
...  
Keyword(s):  
First Generation ◽  
Pp Collisions ◽  
Generation Scalar ◽  
Scalar Leptoquarks

scholarly journals Search for first-generation scalar leptoquarks inpp¯collisions ats=1.96   TeV

2005 ◽  
Vol 72 (5) ◽  
Author(s):  
D. Acosta ◽  
J. Adelman ◽  
T. Affolder ◽  
T. Akimoto ◽  
M. G. Albrow ◽  
...  
Keyword(s):  
First Generation ◽  
Generation Scalar ◽  
Scalar Leptoquarks

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 Rare Isotope Production in peripheral heavy-ion collisions in the energy range 15-25 MeV/nucleon

2019 ◽  
Vol 24 ◽  
pp. 207
Author(s):  
A. Papageorgiou ◽  
G. A. Souliotis ◽  
Y. K. Kwon ◽  
K. Tshoo ◽  
S. C. Jeong ◽  
...  
Keyword(s):  
Cross Sections ◽  
Production Cross ◽  
Mass Range ◽  
Heavy Ion ◽  
Rare Isotope ◽  
Ion Collisions ◽  
Rare Isotopes ◽  
R Process ◽  
Rare Isotope Production ◽  
Near Future

In this contribution we summarize recent efforts to describe the production of rare isotopes with beams of 15–25 MeV/nucleon expected from low-energy facilities. We first present calculated production cross sections of proton-rich nuclides from collisions of stable beams of mass A∼60–80. Our calculations are performed with the phenomenological deep-inelastic transfer (DIT) model and the microscopic con- strained molecular dynamics model (CoMD). De-excitation of the excited quasipro- jectiles from the dynamical stage of the reaction is performed with the statistical multifragmentation model (SMM). In addition to the efforts on proton-rich nuclides, we investigated the possibility of producing neutron-rich rare isotopes in the mass range A∼180–200, i.e. near the third r-process peak of A=195. We performed calcu- lations for a 208Pb (15MeV/nucleon) beam and find that the multinucleon transfer mechanism leads to very neutron-rich nuclides in this mass range. We believe that our continued progress on the study of multinucleon transfer reactions using heavy- ion beams of 15–25 MeV/nucleon, can provide new opportunities in rare isotope research in the near future, as planned at the KOBRA facility of RISP in Korea.

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].

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