SEMI-INCLUSIVE HADRON PAIR PRODUCTION AND POLARIZED GLUONS IN THE PROTON

2003 ◽  
Vol 18 (08) ◽  
pp. 1273-1280
Author(s):  
YU-BING DONG ◽  
T. MORII ◽  
T. YAMANISHI
Keyword(s):  
Pair Production ◽  
Cross Sections ◽  
Gluon Distribution ◽  
Gluon Fusion ◽  
Symmetry Relation ◽  
Signal Process ◽  
Production Processes ◽  
Light Hadron ◽  
Fragmentation Functions ◽  
New Formula

To extract the polarized gluon distribution Δg, we study the large–pTlight hadron pair productions in polarized semi-inclusive reaction, which are dominantly produced via 2 mechanisms: photon–gluon fusion(PGF) and QCD Compton. The PGF gives us a direct information on Δg in the nucleon, whereas QCD Compton is background to the signal process for extracting Δg. By using symmetry relation among fragmentation functions and taking an appropriate combination of light hadron pair production processes, we can remove an effect of QCD Compton from those cross sections. Here we propose a new formula for extracting Δg from those processes.

scholarly journals Top Partner Production at e+e- Collider in the Littlest Higgs Model with T-Parity

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Haiyan Wang ◽  
Bingfang Yang
Keyword(s):  
Pair Production ◽  
Cross Sections ◽  
High Energy ◽  
Higgs Model ◽  
Dilepton Channel ◽  
Associated Production ◽  
Production Processes ◽  
The Future ◽  
Signal Significance ◽  
The Cross

In the framework of the littlest Higgs Model with T-parity, we discuss the top partner production at future e+e- collider. We calculate the cross sections of the top partner production processes and associated production processes of Higgs and top partner under current constraints. Then, we investigate the observability of the T-odd top partner pair production through the process e+e-→T-T¯-→tt¯AHAH in the tt¯ dilepton channel for two T-odd top partner masses mT-=603  (708) GeV at s=1.5 TeV. We analyze the signal significance depending on the integrated luminosity and find that this signal is promising at the future high energy e+e- collider.

scholarly journals Charged Higgs pair production at the LHC as a probe of the top-seesaw assisted technicolor model

2016 ◽  
Vol 31 (20n21) ◽  
pp. 1650119
Author(s):  
Guo-Li Liu ◽  
Ping Zhou ◽  
Xiao-Fei Guo ◽  
Kun Wu ◽  
Ji Jiang
Keyword(s):  
Pair Production ◽  
Cross Sections ◽  
Higgs Mass ◽  
Production Cross ◽  
Gluon Fusion ◽  
Higgs Bosons ◽  
Hadron Colliders ◽  
Technicolor Model ◽  
Charged Higgs ◽  
Tc Model

The top-seesaw assisted technicolor (TC) model, which was proposed recently to accommodate the 126 GeV Higgs mass discovered by the Large Hadron Colliders (LHC), predicts light and heavy charged Higgs bosons in addition to the neutral Higgses. In this paper, we will study the pair productions of the charged Higgs, proceeding through gluon–gluon fusion and quark–antiquark annihilation, at the LHC in the frame of the top-seesaw assisted TC model. We find that in a large part of parameter space the production cross-sections of the light charged Higgs pair at the LHC can be quite large compared with the low standard model backgrounds, while it is impossible for the pair production of the heavy ones to be detected with the strong final mass suppression. Therefore, the light charged Higgs pair production may be served as a probe of this new TC model at the LHC.

scholarly journals Universality-breaking effects in $$e^+e^-$$ hadronic production processes

2021 ◽  
Vol 81 (1) ◽  
Author(s):  
M. Boglione ◽  
A. Simonelli
Keyword(s):  
Transverse Momentum ◽  
Pair Production ◽  
Cross Section ◽  
Cross Sections ◽  
Hadron Production ◽  
Transverse Momentum Dependent ◽  
Production Processes ◽  
Phenomenological Studies ◽  
Hadronic Production ◽  
Soft Factors

AbstractRecent BELLE measurements provide the cross section for single hadron production in $$e^+e^-$$ e + e - annihilations, differential in thrust and in the hadron transverse momentum with respect to the thrust axis. Universality breaking effects due to process-dependent soft factors make it very difficult to relate this cross sections to those corresponding to hadron-pair production in $$e^+e^-$$ e + e - annihilations, where transverse momentum dependent (TMD) factorization can be applied. The correspondence between these two cross sections is examined in the framework of the Collins-Soper-Sterman factorization, in the collinear as well as in the TMD approach. We propose a scheme that allows to relate the TMD parton densities defined in 1-hadron and in 2-hadron processes, neatly separating, within the soft and collinear parts, the non-perturbative terms from the contributions that can be calculated perturbatively. The regularization of rapidity divergences introduces cut-offs, the arbitrariness of which will be properly reabsorbed by means of a mechanism closely reminiscent of a gauge transformation. In this way, we restore the possibility to perform global phenomenological studies of TMD physics, simultaneously analyzing data belonging to different hadron classes.

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.

scholarly journals Fusion cross-sections for inertial fusion energy

2004 ◽  
Vol 22 (4) ◽  
pp. 469-477 ◽  
Author(s):  
XING ZHONG LI ◽  
BIN LIU ◽  
SI CHEN ◽  
QING MING WEI ◽  
HEINRICH HORA
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Light Nucleus ◽  
Resonant Tunneling ◽  
Fusion Energy ◽  
Inertial Fusion ◽  
Inertial Fusion Energy ◽  
Fusion Reactions ◽  
Tunneling Model ◽  
New Formula

The application of selective resonant tunneling model is extended from d + t fusion to other light nucleus fusion reactions, such as d + d fusion and d + 3He. In contrast to traditional formulas, the new formula for the cross-section needs only a few parameters to fit the experimental data in the energy range of interest. The features of the astrophysical S-function are derived in terms of this model. The physics of resonant tunneling is discussed.

Differential and cumulative integral cross sections of electron-field pair production: Experimental study at 2.614 MeV using a streamer chamber

1977 ◽  
Vol 15 (3) ◽  
pp. 1068-1078 ◽  
Author(s):  
J. Augerat ◽  
M. Avan ◽  
M. J. Parizet ◽  
G. Roche ◽  
J. Arnold ◽  
...  
Keyword(s):  
Experimental Study ◽  
Pair Production ◽  
Cross Sections ◽  
Electron Field

scholarly journals Top Precision for Associated Top-pair Production Processes at the LHC

2020 ◽  
Vol 51 (6) ◽  
pp. 1425
Author(s):  
A. Kulesza ◽  
L. Motyka ◽  
D. Schwartländer ◽  
T. Stebel ◽  
V. Theeuwes
Keyword(s):  
Pair Production ◽  
Production Processes ◽  
Top Pair Production

scholarly journals Fiducial cross sections for the lepton-pair-plus-photon decay mode in Higgs production up to NNLO QCD

2022 ◽  
Vol 2022 (1) ◽  
Author(s):  
X. Chen ◽  
T. Gehrmann ◽  
E. W. N. Glover ◽  
A. Huss
Keyword(s):  
Higgs Boson ◽  
Decay Mode ◽  
Cross Sections ◽  
Gluon Fusion ◽  
Lepton Pair ◽  
Distinctive Features ◽  
Photon Decay ◽  
Higgs Decay ◽  
Decay Products ◽  
Three Body

Abstract The rare three-body decay of a Higgs boson to a lepton-antilepton pair and a photon is starting to become experimentally accessible at the LHC. We investigate how higher-order QCD corrections to the dominant gluon-fusion production process impact on the fiducial cross sections in this specific Higgs decay mode for electrons and muons. Corrections up to NNLO QCD are found to be sizeable. They are generally uniform in kinematical variables related to the Higgs boson, but display several distinctive features in the kinematics of its individual decay products.

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