Pure spin-3/2 representation with consistent interactions

Mart, T.; Kristiano, J.; Clymton, S.

doi:10.1103/physrevc.100.035207

Cited by 11 publications

(5 citation statements)

References 28 publications

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“…This is understandable because the resonance masses used in the present analysis are below 2.3 GeV. However, this asymmetrical suppression is required for the covariant description of a resonance due to the large contribution of a Z-diagram that indicates the existence of a particle and an antiparticle in the intermediate state [35]. This contribution increases quickly as the energy of resonance increases beyond the resonance mass and, therefore, requires an increasing suppression.…”

Section: A General Resultsmentioning

confidence: 89%

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Extracting the pole and Breit-Wigner properties of nucleon and $Δ$ resonances from the $γN\to KΣ$ photoproduction

Clymton,

Mart

2021

Preprint

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We have developed a covariant isobar model to phenomenologically explain the four possible isospin channels of KΣ photoproduction. To obtain a consistent reaction amplitude, which is free from the lower-spin background problem, we used the consistent electromagnetic and hadronic interactions described in our previous report. We used all available experimental data, including the recent MAMI A2 2018 data obtained for the K 0 Σ + and K 0 Σ 0 isospin channels. By fitting the calculated observables to these data we extract the resonance properties, including their Breit-Wigner and pole parameters. Comparison of the extracted parameters with those listed by the Particle Data Group yields a nice agreement. An extensive comparison of the calculated observables with experimental data is also presented. By using the model we investigated the effects of three different form factors used in the hadronic vertex of each diagram. A brief discussion on the form factors is given.

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Section: A General Resultsmentioning

confidence: 89%

“…This contribution increases quickly as the energy of resonance increases beyond the resonance mass and, therefore, requires an increasing suppression. In our previous study [35] it was shown that the dipole form factor given by Eq. ( 18) is suitable for this purpose.…”

Section: A General Resultsmentioning

confidence: 98%

Extracting the pole and Breit-Wigner properties of nucleon and $Δ$ resonances from the $γN\to KΣ$ photoproduction

Clymton,

Mart

2021

Preprint

Self Cite

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“…This fact has been often ignored in nuclear physics when computing the pion-nucleon interaction mediated by a spin-3/2 ∆ resonance [19][20][21][22][23][24], for instance, and in collider studies of generic spin-3/2 particles. There have been attempts to cure the problem by rewriting the interactions of the spin-3/2 fields [25][26][27][28][29][30][31][32][33][34][35][36][37]. Difficulties in formulating ∆-resonance interactions in a Lagrangian description have been discussed in ref.…”

Section: Jhep05(2021)254mentioning

confidence: 99%

Higher-spin particles at high-energy colliders

Criado

Djouadi

Koivunen

et al. 2021

J. High Energ. Phys.

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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.

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“…Unfortunately, as explained above, the interacting Rarita-Schwinger field in the Lorentz representation (1, 1/2) contains unphysical degrees of freedom. In nuclear physics, where spin-3/2 resonances must be described, physicists avoid the extra degrees of freedom by using second-derivative Lagrangians with specifically chosen interactions to describe the (3/2, 0) representation [31][32][33]. We argue that, in this case, even the free field theory cannot be quantized consistently without introducing new fields and constraints (see Appendix B), despite the fact that the SM does admit the second-order formulation [34,35].…”

Section: Introductionmentioning

confidence: 99%

Dark matter of any spin -- an effective field theory and applications

Criado,

Koivunen,

Raidal

et al. 2020

Preprint

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We develop an effective field theory of a generic massive particle of any spin and, as an example, apply this to study higher-spin dark matter (DM). Our formalism does not introduce unphysical degrees of freedom, thus avoiding the potential inconsistencies that may appear in other fieldtheoretical descriptions of higher spin. Being a useful reformulation of the Weinberg's original idea, the proposed effective field theory allows for consistent computations of physical observables for general-spin particles, although it does not admit a Lagrangian description. As a specific realization, we explore the phenomenology of a general-spin singlet with Z2-symmetric Higgs portal couplings, a setup which automatically arises for high spin, and show that higher spin particles with masses above O(10) TeV can be viable thermally-produced DM candidates. Most importantly, if the general-spin DM has purely parity-odd couplings, it naturally avoids all DM direct detection bounds, in which case its mass can lie below the electroweak scale. Our formalism reproduces the existing results for low-spin DM, and allows one to develop consistent higher-spin particle physics phenomenology for high-and low-energy experiments and cosmology.

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Pure spin-3/2 representation with consistent interactions

Cited by 11 publications

References 28 publications

Extracting the pole and Breit-Wigner properties of nucleon and $Δ$ resonances from the $γN\to KΣ$ photoproduction

Extracting the pole and Breit-Wigner properties of nucleon and $Δ$ resonances from the $γN\to KΣ$ photoproduction

Higher-spin particles at high-energy colliders

Dark matter of any spin -- an effective field theory and applications

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