scholarly journals Energy and angular distributions of the bottom quark in the electron–positron annihilation e+e−→ bW+t̄

2021 ◽  
Vol 36 (02) ◽  
pp. 2150013
Author(s):  
I. V. Truten ◽  
A. Yu. Korchin
Keyword(s):  
Cross Sections ◽  
Linear Collider ◽  
Bottom Quark ◽  
Effective Field ◽  
Beyond The Standard Model ◽  
Electron Positron Annihilation ◽  
Electron Positron ◽  
The Cross ◽  
Energy And Angular Distributions ◽  
Modified Formula

The distributions of the bottom quark in the process [Formula: see text] are considered at the [Formula: see text] energy corresponding to the first construction stage of the Compact Linear Collider. The cross-sections of [Formula: see text], as functions of the [Formula: see text]-quark energy and angle with respect to the direction of the electron beam, are derived and calculated. The effects of physics beyond the Standard Model are included via the modified [Formula: see text] and [Formula: see text] couplings which naturally appear in effective field theories. In addition to the cross-sections, the energy and angular asymmetries are calculated. The dependence of these observables on the [Formula: see text] energy is calculated, and features of this dependence are investigated.

scholarly journals Double Higgs boson production and Higgs self-coupling extraction at CLIC

2020 ◽  
Vol 80 (11) ◽  
Author(s):  
Philipp Roloff ◽  
Ulrike Schnoor ◽  
Rosa Simoniello ◽  
Boruo Xu
Keyword(s):  
Higgs Boson ◽  
Cross Section ◽  
W Boson ◽  
Linear Collider ◽  
Invariant Mass Distribution ◽  
Gauge Coupling ◽  
High Energy ◽  
Electron Positron ◽  
The Cross ◽  
Detector Simulation

AbstractThe Compact Linear Collider (CLIC) is a future electron–positron collider that will allow measurements of the trilinear Higgs self-coupling in double Higgs boson events produced at its high-energy stages with collision energies from $$\sqrt{s}$$ s  = 1.4 to 3 TeV. The sensitivity to the Higgs self-coupling is driven by the measurements of the cross section and the invariant mass distribution of the Higgs-boson pair in the W-boson fusion process, $$\text {e}^{+}\text {e}^{-}\rightarrow {\text {H}\text {H}\nu \bar{\nu }}$$ e + e - → HH ν ν ¯ . It is enhanced by including the cross-section measurement of ZHH production at 1.4 TeV. The expected sensitivity of CLIC for Higgs pair production through W-boson fusion is studied for the decay channels $$\mathrm{b}\bar{\mathrm{b}}\mathrm{b}\bar{\mathrm{b}}$$ b b ¯ b b ¯   and $$\mathrm{b}\bar{\mathrm{b}}\mathrm{W}\mathrm{W}^{*}$$ b b ¯ W W ∗   using full detector simulation including all relevant backgrounds at $$\sqrt{s}$$ s = 1.4 TeV with an integrated luminosity of $$\mathcal {L}$$ L  = 2.5 ab$$^{-1}$$ - 1 and at $$\sqrt{s}$$ s = 3 TeV with $$\mathcal {L}$$ L  = 5 ab$$^{-1}$$ - 1 . Combining $$\text {e}^{+}\text {e}^{-}\rightarrow {\text {H}\text {H}\nu \bar{\nu }}$$ e + e - → HH ν ν ¯ and ZHH  cross-section measurements at 1.4 TeV with differential measurements in $$\text {e}^{+}\text {e}^{-}\rightarrow {\text {H}\text {H}\nu \bar{\nu }}$$ e + e - → HH ν ν ¯ events at 3 TeV, CLIC will be able to measure the trilinear Higgs self-coupling with a relative uncertainty of $$-8\%$$ - 8 % and $$ +11\%$$ + 11 % at 68% C.L., assuming the Standard Model. In addition, prospects for simultaneous constraints on the trilinear Higgs self-coupling and the Higgs-gauge coupling HHWW are derived based on the $${\text {H}\text {H}\nu \bar{\nu }}$$ HH ν ν ¯ measurement.

scholarly journals NLO QCD corrections to exclusive quarkonium-pair production in photon–photon collision

2020 ◽  
Vol 80 (9) ◽  
Author(s):  
Hao Yang ◽  
Zi-Qiang Chen ◽  
Cong-Feng Qiao
Keyword(s):  
Pair Production ◽  
Cross Sections ◽  
Linear Collider ◽  
International Linear Collider ◽  
Leading Order ◽  
Numerical Result ◽  
Electron Positron ◽  
Belle Ii ◽  
Exclusive Processes ◽  
Photon Collision

AbstractWe calculate the next-to-leading order (NLO) quantum chromodynamics (QCD) corrections to the exclusive processes $$\gamma +\gamma \rightarrow {\mathcal {Q}}+{\mathcal {Q}}$$ γ + γ → Q + Q , with $${\mathcal {Q}}=J/\psi ,\ \eta _c,\ \Upsilon $$ Q = J / ψ , η c , Υ , or $$\eta _b$$ η b , in the framework of non-relativistic QCD (NRQCD) factorization formalism. The cross sections at the SuperKEKB electron–positron collider, as well as at the future colliders, like the circular electron positron collider (CEPC) and the international linear collider (ILC), are evaluated. Numerical result indicates that the processes for $$J/\psi $$ J / ψ -pair production and $$\eta _c$$ η c -pair production are hopefully observable at the Belle II detector within the next decade.

ASSOCIATED PRODUCTION OF LIGHT PSEUDOSCALAR BOSON η WITH TOP QUARK PAIRS IN THE SLH MODEL AT THE ILC

2011 ◽  
Vol 26 (21) ◽  
pp. 1577-1586 ◽  
Author(s):  
JINZHONG HAN ◽  
DAPENG YANG ◽  
XUELEI WANG
Keyword(s):  
Standard Model ◽  
Cross Section ◽  
Cross Sections ◽  
Top Quark ◽  
Linear Collider ◽  
International Linear Collider ◽  
Quark Pairs ◽  
Associated Production ◽  
The Standard Model ◽  
The Cross

The light pseudoscalar boson η is the typical particle predicted by the Simplest Little Higgs (SLH) model. In this paper, we investigate some processes of the associated production of a light pseudoscalar boson η with a pair of top quarks in the SLH model at the International Linear Collider (ILC), i.e. [Formula: see text] and [Formula: see text]. We find that the cross-sections of these two processes could reach [Formula: see text] fb in the favorite parameter space in the SLH model, which is consistent with the results of the cross-section of [Formula: see text] in the standard model and the cross-section of [Formula: see text] in the minimal supersymmetric standard model. It should be clear that hundreds to thousands of η can be produced at the ILC per year, these processes of [Formula: see text] are really interesting in testing the standard model and searching the signs of the SLH model.

scholarly journals Exclusion Limits on a Scalar Decaying to Photons and Distinguishing Its Production Mechanisms

2018 ◽  
Vol 2018 ◽  
pp. 1-14 ◽  
Author(s):  
Tanumoy Mandal
Keyword(s):  
Cross Sections ◽  
Effective Field Theory ◽  
Gluon Fusion ◽  
Effective Field ◽  
Beyond The Standard Model ◽  
Theory Approach ◽  
The Standard Model ◽  
Resonance Search ◽  
Model Independent ◽  
Production Mechanisms

LHC run-II has a great potential to search for new resonances in the diphoton channel. Latest 13 TeV data already put stringent limits on the cross sections in the diphoton channel assuming the resonance is produced through the gluon-gluon fusion. Many beyond the Standard Model (SM) theories predict TeV-scale scalars, which copiously decay to diphotons. Apart from the gluon-gluon fusion production, these scalars can also be dominantly produced in other ways too at the LHC, namely, through the quark-quark fusion or the gauge boson fusions like the photon-photon, photon-Z, WW, or ZZ fusions. In this paper we use an effective field theory approach where a heavy scalar can be produced in various ways and recast the latest ATLAS diphoton resonance search to put model-independent limits on its mass and effective couplings to the SM particles. If a new scalar is discovered at the LHC, it would be very important to identify its production mechanism in order to probe the nature of the underlying theory. We show that combining various kinematic variables in a multivariate analysis can be very powerful to distinguish different production mechanisms from one another.

New results of measurement of cross sections for electron-positron annihilation to hadrons with the SND detector at VEPP-2000

2015 ◽  
Vol 78 (4) ◽  
pp. 497-508
Author(s):  
V. M. Aulchenko ◽  
M. N. Achasov ◽  
A. Yu. Barnyakov ◽  
K. I. Beloborodov ◽  
A. V. Berdyugin ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Cross Sections ◽  
Electron Positron Annihilation ◽  
Electron Positron

scholarly journals Double elementary Goldstone Higgs boson production in future linear colliders

2018 ◽  
Vol 33 (08) ◽  
pp. 1850038
Author(s):  
Yu-Chen Guo ◽  
Chong-Xing Yue ◽  
Zhi-Cheng Liu
Keyword(s):  
Higgs Boson ◽  
Cross Sections ◽  
New Physics ◽  
Boson Production ◽  
Linear Electron ◽  
Higgs Boson Production ◽  
Electron Positron ◽  
The Standard Model ◽  
Linear Colliders ◽  
The Cross

The Elementary Goldstone Higgs (EGH) model is a perturbative extension of the Standard Model (SM), which identifies the EGH boson as the observed Higgs boson. In this paper, we study pair production of the EGH boson in future linear electron positron colliders. The cross-sections in the TeV region can be changed to about −27%, 163% and −34% for the [Formula: see text], [Formula: see text] and [Formula: see text] processes with respect to the SM predictions, respectively. According to the expected measurement precisions, such correction effects might be observed in future linear colliders. In addition, we compare the cross-sections of double SM-like Higgs boson production with the predictions in other new physics models.

e+e- HADRON PRODUCTION CROSS SECTIONS AT BELLE

2014 ◽  
Vol 35 ◽  
pp. 1460407
Author(s):  
JASON D. CRNKOVIC ◽  
Keyword(s):  
Cross Sections ◽  
Solid Angle ◽  
Standard Model Prediction ◽  
Production Cross ◽  
General Purpose ◽  
Final State ◽  
Belle Detector ◽  
Electron Positron Annihilation ◽  
Electron Positron ◽  
The Standard Model

A number of production cross sections for electron-positron annihilation to a hadronic final state have been measured using the Belle dataset, which is possible given the general purpose design of the Belle detector and its large solid-angle coverage. The cross section measurements predominantly fall above 3 GeV, which still leaves the opportunity for using the dataset to systematically measure cross sections below 3 GeV. These low-energy cross sections are important for improving the precision of the Standard Model prediction for the muon anomalous magnetic moment.

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