| 1. |
- Andersson, B., et al.
(författare)
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A semiclassical model for quark jet fragmentation
- 1979
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Ingår i: Zeitschrift für Physik C Particles and Fields. - 0170-9739. ; 1:1, s. 105-116
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Tidskriftsartikel (refereegranskat)abstract
- A semiclassical model is presented for the way the energy of a fast quark is transformed into observable hadrons. It reproduces the features of 1+1 dimensional QED (the Schwinger model) concerning a flat rapidity distribution in the central region. It also reproduces results from phenomenological considerations, which, based upon scaling, predict that meson formation in the fragmentation region can be described by an iterative scheme, implying a set of coupled integral equations. In particular the model predicts that the probability to find a meson containing the leading quark is independent of the Feynman scaling variable z. The iterative structure corresponds to a Brownian motion with relevance both to the confinement problems and to the distribution of mass in the quark jet.
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| 2. |
- Andersson, B., et al.
(författare)
-
A statistical model for quark fragmentation into mesons with emphasis on vector meson contributions
- 1978
-
Ingår i: Nuclear Physics, Section B. - : Elsevier BV. - 0550-3213. ; 135:2, s. 273-284
-
Tidskriftsartikel (refereegranskat)abstract
- This paper is the first part of a program to deal with the relative importance of the different effects in a colour dipole field when the field energy is transformed into hadrons according to a statistical scheme with the sole constraints coming from energy and momentum conservation and the requirements of scaling. In this paper we treat the meson distributions from quark fragmentation with particular emphasis on the importance of a vector meson production of the size observed at present. We neglect diquark formation and the baryon distributions as a first approximation. The simplicity of the approach will make it possible to easily understand the size and the shape of the different contributions.
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| 3. |
- Andersson, Bo, et al.
(författare)
-
Quark Jet Fragmentation
- 1979
-
Ingår i: Physica Scripta. - : IOP Publishing. - 0031-8949 .- 1402-4896. ; 19:2, s. 184-190
-
Tidskriftsartikel (refereegranskat)abstract
- A semiclassical model is presented for the way the energy of a fast quark is transformed into observable hadrons. It reproduces the features of 1 + 1 dimensional QED (the Schwinger model) concerning a flat rapidity distribution in the central region. In particular the model predicts that the probability to find a meson containing a leading quark is independent of the Feynman scaling variable. Also a quark jet interpretation of low PT jets in hadronic interactions is discussed shortly.
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| 4. |
- Andersson, B., et al.
(författare)
-
The relationship between the meson, baryon, photon and quark fragmentation distributions
- 1977
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Ingår i: Physics Letters B. - : Elsevier BV. - 0370-2693. ; 69:2, s. 221-224
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Tidskriftsartikel (refereegranskat)abstract
- The ideas presented in an earlier note on the relationship between the quark fragmentation distributions as measured in leptoproduction and the one particle distributions in the mesonic fragmentation regions of hadronic interactions are carried further to photoproduction and to the baryon fragmentation distributions. The results are as before interpreted in terms of a simple additive quark model where the main interaction is due to the wee partons whereas almost all the initial momentum is carried by one of the valence quarks or a diquark.
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| 5. |
- Hirsch, Jan M, et al.
(författare)
-
Periapical surgery
- 1979
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Ingår i: International journal of oral surgery. - 0300-9785. ; 8:3, s. 173-185
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Tidskriftsartikel (refereegranskat)abstract
- A retrospective study of 572 teeth treated with periapical surgery was undertaken in order to evaluate the influence of preoperative, operative and postoperative factors in the healing process as well as the operation method used. It was also the aim to assess whether the histophatological diagnosis of biopsies taken at the operation could be correlated to healing. Statistical analyses by the AID method and conventional cross-classification methods were performed. Factors of importance were found to be the extent of the destrucion, the operation method used, the bone surrounding the destruction, the quality of the orthograde root filling, the age of the patient, and the marginal bone buccally. The operation method was of importance in large destructions where root fillings were considered as not having properly sealed the canals, and when treating inflamed cysts. The histopathological diagnosis could not be ascribed any definite prognostic value.
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