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C. Boros

Publications and source records attributed to C. Boros.

31 records · Page 2Linked to original sources
arXiv1998

Spin content of Lambda and its longitudinal polarization in $e^+e^-$ annihilation at high energies

Longitudinal polarization of Lambda produced in $e^+e^-$ annihilation at LEP energies is calculated in a picture for the spin content of Lambda which is consistent with the polarized deep inelastic lepton-nucleon scattering data and SU(3) flavor symmetry for hyperon decay so that the spin of Lambda is not completely carried by its $s$-valence quark. A comparison with the recent ALEPH data and the results of earlier calculations based on the static quark model in which the spin of Lambda is completely determined by the $s$-quark is given. The result shows that further measurements of such polarization should provide useful information to the question of which picture is more suitable in describing the spin effects in the fragmentation processes.

hep-ph↗
arXiv1997

Hyperon polarization and single spin left-right asymmetry in inclusive production processes at high energies

It is shown that the polarization of hyperons observed in high energy collisions using unpolarized hadron beams and unpolarized nucleon or nuclear targets is closely related to the left-right asymmetries observed in single spin inclusive hadron production processes. The relationship is most obvious for the production of the hyperons which have only one common valence quark with the projectile. Examples of this kind are given. Further implications of the existence of large polarization for hyperon which has two valence quarks in common with the projectile and their consequences are discussed. A comparison with the available data is made. Further tests are suggested.

hep-ph↗
arXiv1997

Probing the exchanged object(s) in diffractive scattering

The reaction mechanisms of the following proton diffractive scattering processes are studied and compared with one another: $γ^* p\to Vp,γ^* p\to Xp, pp\to (ΛK^+)p$ and $pA\to ΛK^+A$ (Here, $γ^*$ stands for the space-like photon in inelastic electron-proton scattering, $V$ for the vector mesons $ρ,ω,ϕ,J/ψ$, and $A$ for a target nucleus.) It is shown that, by taking parity, and C--parity conservation into account, the existing data for these reactions strongly suggest the following: A considerable part of the objects exchanged between projectile and target in the above-mentioned processes are virtual quark-antiquark pairs in color-singlet states with $J^{PC}=0^{-+}$, $I^G=0^+$, where $J$ stands for total angular momentum, $I$ for isospin, $P$, $C$ and $G$ stand for parity, C-parity and G-parity respectively. Such quark-antiquark pairs are created by soft-gluon interactions. New experiments are suggested; and predictions for such experiments are made.

hep-ph↗
arXiv1996

Testing the mechanisms proposed in different models for single-spin asymmetries

It is shown that the origin of the striking left-right asymmetries observed in single-spin inclusive hadron production processes in high energy hadron-hadron collisions can be traced by performing suitable experiments. Several new experiments are proposed. The possible outcomes are summarized together with those of other relevant experiments which have already been suggested. It is pointed out that the results of such a set of experiments will not only be able to differentiate between existing theoretical models, but also be helpful in locating the source(s) of the observed asymmetries.

hep-ph↗
arXiv1996

Colorless and colored gluon-clusters in nucleon?

It is suggested that virtual gluon-clusters exist in nucleon, and that such colorless and colored objects manifest themselves in the small $x_B$ region of inelastic lepton-nucleon scattering processes. The relationship between the space-time properties of such clusters and the striking features observed in these scattering processes is discussed. A phase-space model is used to show how quantitative results can be obtained in such an approach. The results of this model-calculation are in reasonable agreement with the existing data. Further experiments are suggested.

hep-ph↗
arXiv1996

Probing dissociation of space-like photons in deep-inelastic lepton-nucleon scattering

It is shown that the hadronic dissociation of space-like $(Q^2>0)$ photons can be directly probed by performing measurements in the fragmentation region of transversely polarized and unpolarized proton beams at the electron-proton collider HERA. Measurements of momentum-distributions in the photon-fragmentation region in normal and in LRG (large rapidity gap) events are also suggested --- especially when the scattered proton or neutron in the proton-beam direction is tagged. It is pointed out that such distributions can yield useful information on the mechanisms of hadronic fragmentation in general, and answer the following questions in particular: Is the well-known hypothesis of limiting fragmentation (HFL) valid in color-exchange, in flavor-exchange, or only in vacuum-quantum-number-exchange processes ?

hep-ph↗
arXiv1995

New results of the Berliner relativistic quark model

It is pointed out that the recently measured left-right asymmetries in inclusive pion and lambda hyperon production processes are in very good agreement with the relativistic quark model, proposed some time ago. Further predictions based on this model for hyperon productions, for lepton pair productions and for W/Z-boson productions are also presented.

hep-ph↗
arXiv1995

Hyperon production mechanisms and single-spin asymmetry in high energy hadron-hadron collisions

It is shown that the existence of left-right asymmetry in single-spin inclusive Lambda production, together with the characteristic features of the data, should be considered as another clear signature for the existence of orbiting valence quarks in polarized nucleons. Predictions for other hyperons are made. It is pointed out that measurements of such asymmetries are very helpful not only for probing the spin structure of the nucleons but also for studying the production mechanisms of the hyperons.

hep-ph↗