| 1. |
- Ekelin, Svante, et al.
(författare)
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Baryons from diquarks in e+e- annihilation
- 1983
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Ingår i: Physical Review D. Particles and fields. - 0556-2821 .- 1089-4918. ; 28:1, s. 257-259
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- We find experimental support for the view that diquarks appear only as spin-0 objects. When their production rate in the color field of a quark from e+e- annihilation is described by the appropriate Schwinger formula for scalars, it turns out that they must be substantially lighter than earlier believed in order to explain the baryon yield.
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| 2. |
- Ekelin, Svante, et al.
(författare)
-
Indications of hard diquarks in e+e- annihilation
- 1984
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Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 30:11, s. 2310-2315
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Tidskriftsartikel (refereegranskat)abstract
- It is suggested that very small spin-0 diquarks are directly produced in e+e- annihilation and then fragment into leading baryons and other hadrons. The most influential diquark is the charmed diquark (uc), due to its high charge. It gives a sizable contribution to the hadronic R factor and to the two-jet angular distribution in the energy region W=4-8 GeV. At these energies, a careful study of Λ production would provide the best additional test of the model.
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| 3. |
- Fredriksson, Sverker, et al.
(författare)
-
A comment on diquark fragmentation
- 1983
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Ingår i: Physical Review D. Particles and fields. - 0556-2821 .- 1089-4918. ; 28:1, s. 255-256
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- We discuss diquark fragmentation and suggest that a spectator uu system in deep-inelastic lepton-nucleon scattering has a larger breakup probability than a ud system. The reason for this is argued to be that half of the leftover ud systems are in bound (ud)0 diquark configurations, while no such bound uu diquarks exist.
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| 4. |
- Fredriksson, Sverker, et al.
(författare)
-
A new diquark model for deep inelastic structure functions
- 1982
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Ingår i: Zeitschrift für Physik C Particles and Fields. - 0170-9739 .- 1431-5858. ; 14:1, s. 35-39
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Tidskriftsartikel (refereegranskat)abstract
- The bulk of data from deep inelasticep, eD, μp, μN, νp and νN scattering is fitted with a new diquark model of nucleons. The proton is found to be mostly in au(ud) 0 state, where the (ud)0 diquark has spin and isospin zero. There is hence no trace ofSU(6) symmetry among diquarks in nucleons.
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| 5. |
- Fredriksson, Sverker, et al.
(författare)
-
Are "Gluon Effects" caused by diquarks?
- 1983
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Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 51:24, s. 2179-2182
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Tidskriftsartikel (refereegranskat)abstract
- The possible importance of diquarks in high-energy physics is discussed and it is suggested that this nonperturbative phenomenon can explain the trends in high-energy data that are usually attributed to gluon processes as described by perturbative QCD. Several experimental tests are suggested for discriminating between gluon and diquark phenomena.
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| 6. |
- Fredriksson, Sverker, et al.
(författare)
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Probing spin-1 diquarks in deep inelastic structure functions
- 1983
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Ingår i: Zeitschrift für Physik C Particles and Fields. - 0170-9739 .- 1431-5858. ; 19:1, s. 53-55
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Tidskriftsartikel (refereegranskat)abstract
- Within the scope of a new diquark model for deep inelastic structure functions presented by us recently we use the existing data onF 1 ep (x,Q2) to learn about the admixture of spin-1 diquarks in nucleons. It turns out that they are so rare, heavy and extended compared to spin-0 diquarks that they are presumably accidental and not dynamical. Their number and form factors can be understood qualitatively within this picture. Still, the spin-1 diquarks give interesting structures in data and, together with quarks and spin-0 diquarks, carry enough momentum to account for the full nucleon energy. A gluon component is hence not needed in the nucleon!
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