scholarly journals Higher-spin particles at high-energy colliders

2021 ◽  
Vol 2021 (5) ◽  
Author(s):  
Juan C. Criado ◽  
Abdelhak Djouadi ◽  
Niko Koivunen ◽  
Martti Raidal ◽  
Hardi Veermäe
Keyword(s):  
Cross Sections ◽  
Production Cross ◽  
High Energy ◽  
Effective Field ◽  
Decay Rates ◽  
Theory Approach ◽  
Electron Positron ◽  
Higher Spin ◽  
Feynman Rules ◽  
Spin Fields

Abstract Using an effective field theory approach for higher-spin fields, we derive the interactions of colour singlet and electrically neutral particles with a spin higher than unity, concentrating on the spin-3/2, spin-2, spin-5/2 and spin-3 cases. We compute the decay rates and production cross sections in the main channels for spin-3/2 and spin-2 states at both electron-positron and hadron colliders, and identify the most promising novel experimental signatures for discovering such particles at the LHC. The discussion is qualitatively extended to the spin-5/2 and spin-3 cases. Higher-spin particles exhibit a rich phenomenology and have signatures that often resemble the ones of supersymmetric and extra-dimensional theories. To enable further studies of higher-spin particles at collider and beyond, we collect the relevant Feynman rules and other technical details.

scholarly journals Inclusive production of heavy quarkonia in pNRQCD

2021 ◽  
Vol 2021 (9) ◽  
Author(s):  
Nora Brambilla ◽  
Hee Sok Chung ◽  
Antonio Vairo
Keyword(s):  
Cross Sections ◽  
Production Cross ◽  
Distance Matrix ◽  
Effective Field ◽  
Heavy Quarkonia ◽  
Inclusive Production ◽  
Theory Approach ◽  
Matrix Elements ◽  
Long Distance ◽  
Nonrelativistic Qcd

Abstract We develop a formalism for computing inclusive production cross sections of heavy quarkonia based on the nonrelativistic QCD and the potential nonrelativistic QCD effective field theories. Our formalism applies to strongly coupled quarkonia, which include excited charmonium and bottomonium states. Analogously to heavy quarkonium decay processes, we express nonrelativistic QCD long-distance matrix elements in terms of quarkonium wavefunctions at the origin and universal gluonic correlators. Our expressions for the long-distance matrix elements are valid up to corrections of order $$ 1/{N}_c^2 $$ 1 / N c 2 . These expressions enhance the predictive power of the nonrelativistic effective field theory approach to inclusive production processes by reducing the number of nonperturbative unknowns, and make possible first-principle determinations of long-distance matrix elements once the gluonic correlators are known. Based on this formalism, we compute the production cross sections of P-wave charmonia and bottomonia at the LHC, and find good agreement with measurements.

Probing dark matter via effective field theory approach

2020 ◽  
Vol 17 (02) ◽  
pp. 2050028
Author(s):  
Ayşe Elçi̇boğa Kuday ◽  
Ferhat Özok ◽  
Erdinç Ulaş Saka
Keyword(s):  
Field Theory ◽  
Dark Matter ◽  
Cross Sections ◽  
Effective Field Theory ◽  
High Energy ◽  
New Physics ◽  
Theory Model ◽  
Effective Field ◽  
Tree Level ◽  
Theory Approach

We analyze dark matter in most general form of effective field theory approach. To examine the interactions between the weakly interacting massive particles (WIMPs) and the Standard Model (SM) particles, we use the six-dimensional EFT mediated by new physics scale [Formula: see text] at tree level. After implementing a new effective field theory model in FeynRules [FeynRules 2.0 A complete toolbox for tree-level phenomenology, Comput. Phys. Comm. 185(8) (2014) 2250–2300] We investigate the theory and constrain the theory by using relic density generated by MadDM [MadDM v.3.0: A Comprehensive tool for dark matter studies, Phys. Dark Univ. 24 (2019) 100249] tool of MadGraph5_aMC@NLO [The automated computation of tree-level and next-to-leading order differential cross-sections, and their matching to parton shower simulations, J. High Energy Phys. 79 (2014) 2014].

scholarly journals Hybrid calculation of the MSSM Higgs boson masses using the complex THDM as EFT

2021 ◽  
Vol 81 (2) ◽  
Author(s):  
Henning Bahl ◽  
Nick Murphy ◽  
Heidi Rzehak
Keyword(s):  
Higgs Boson ◽  
Cross Sections ◽  
Production Cross ◽  
Higgs Doublet ◽  
Effective Field ◽  
Decay Rates ◽  
Higgs Decay ◽  
Fixed Order ◽  
Doublet Model ◽  
Two Higgs Doublet Model

AbstractRecently, the Higgs boson masses in the Minimal supersymmetric standard model (MSSM) and their mixing have been calculated using the complex two-Higgs-doublet model (cTHDM) as an effective field theory (EFT) of the MSSM. Here, we discuss the implementation of this calculation, which we improve in several aspects, into the hybrid framework of by combing the cTHDM-EFT calculation with the existing fixed-order calculation. This combination allows accurate predictions also in the intermediate regime where some SUSY particles are relatively light, some relatively heavy and some in between. Moreover, the implementation provides precise predictions for the Higgs decay rates and production cross-sections.

scholarly journals Tau and muon pair production cross sections in electron-positron annihilations ats=10.58  GeV

2008 ◽  
Vol 77 (5) ◽  
Author(s):  
Swagato Banerjee ◽  
Bolek Pietrzyk ◽  
J. Michael Roney ◽  
Zbigniew Was
Keyword(s):  
Pair Production ◽  
Cross Sections ◽  
Production Cross ◽  
Muon Pair ◽  
Electron Positron ◽  
Muon Pair Production

Production cross sections of lithium and beryllium isotopes in 12C by high-energy protons and alpha particles

1971 ◽  
Vol 165 (2) ◽  
pp. 405-414 ◽  
Author(s):  
P. Fontes ◽  
C. Perron ◽  
J. Lestringuez ◽  
F. Yiou ◽  
R. Bernas
Keyword(s):  
Cross Sections ◽  
Production Cross ◽  
High Energy ◽  
Alpha Particles ◽  
Beryllium Isotopes

Production cross sections of tritium in high energy nuclear reactions with 12 GeV protons

1991 ◽  
Vol 42 (6) ◽  
pp. 577-582 ◽  
Author(s):  
Masaharu Noguchi ◽  
Taichi Miura ◽  
Kenjiro Kondo ◽  
Takenori Suzuki ◽  
Yuichi Oki ◽  
...  
Keyword(s):  
Cross Sections ◽  
Nuclear Reactions ◽  
Production Cross ◽  
High Energy

SOME ANALYSIS OF HADRON–NUCLEON COLLISIONS AT HIGH ENERGY INELASTIC INTERACTIONS IN PHOTO-EMULSION

2002 ◽  
Vol 17 (26) ◽  
pp. 1693-1699
Author(s):  
S. M. ABD EL-HALIM
Keyword(s):  
Cross Sections ◽  
Nuclear Emulsion ◽  
Production Cross ◽  
High Energy ◽  
Reaction Cross ◽  
Multiparticle Production ◽  
Incident Momentum ◽  
Multiplicity Distributions ◽  
Pseudorapidity Distributions ◽  
Reaction Cross Sections

The interaction of 400 GeV/c protons and 340 GeV/c π- with nucleons in nuclear emulsion has been investigated. The interaction mean free paths (m.f.p.) and the corresponding reaction cross-sections (σ in ) have been found, the multiplicity distributions for the events with Nh = 0 (clean events) are measured and studied as well as the angular and pseudorapidity distributions. Finally the coherent multiparticle production cross-sections (σ coh ) were estimated and compared with other data, where it was found to be increasing slowly with increasing incident momentum for protons while it increases rapidly with increasing π--momentum.

EQUAL VELOCITY RULE IN HEAVY HADRON PRODUCTION AT HIGH ENERGY

1989 ◽  
Vol 04 (02) ◽  
pp. 369-387 ◽  
Author(s):  
T. KITAZOE ◽  
H. INAZAWA ◽  
T. MORII
Keyword(s):  
Cross Sections ◽  
Particle Production ◽  
Production Cross ◽  
Heavy Particle ◽  
Bound State ◽  
High Energy ◽  
Wave Functions ◽  
Characteristic Energy ◽  
Heavy Particles ◽  
Heavy Hadron

A production mechanism of heavy particles in e+e− annihilations is studied on a field theoretical basis using the bound state wave functions. The requirement that wave functions of hadrons overlap maximally with each other leads to the conclusion that (1) the model predicts a 2-jet structure in a one-loop diagram and (2) heavy hadrons in a jet have an equal velocity. Heavy particle production cross sections and their characteristic energy distributions are calculated for some typical reactions.

scholarly journals Measurement of Neutron Production Cross Sections by High-Energy Heavy Ions

2002 ◽  
Vol 39 (sup2) ◽  
pp. 331-334 ◽  
Author(s):  
Hisaki Sato ◽  
Hiroshi Iwase ◽  
Takashi Nakamura ◽  
Tadahiro Kurosawa ◽  
Noriaki Nakao ◽  
...  
Keyword(s):  
Cross Sections ◽  
Heavy Ions ◽  
Production Cross ◽  
High Energy ◽  
Neutron Production
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