| 1. |
- Andersen, JR, et al.
(författare)
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Small-x phenomenology - summary and status 2002
- 2004
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Ingår i: European Physical Journal C. Particles and Fields. - : Springer Science and Business Media LLC. - 1434-6044. ; 35:1, s. 67-98
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Forskningsöversikt (refereegranskat)abstract
- A second workshop on small-x physics, within the Small-x Collaboration, was held in Lund in June 2002 with the aim of over-viewing recent theoretical progress in this area and summarizing the experimental status.
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| 2. |
- Bijnens, Johan, et al.
(författare)
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Large extra dimensions in rare decays
- 2000
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Ingår i: Journal of High Energy Physics. - : Springer Science and Business Media LLC. - 1029-8479. ; 2000:JHEP10(2000)
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Tidskriftsartikel (refereegranskat)abstract
- The prospect of experimental verification of the large extra dimension scenario in rare decays is discussed. The case of J/ψ and γ to photon + missing energy is calculated in detail, and it is shown that the limit on the compactification scale MS lies at present in the ten GeV range. In contrast to the quarkonium systems, signals in Kaon and Pion decays will be small.
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| 3. |
- Diakonov, D, et al.
(författare)
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Center-vortex solutions of the Yang-Mills effective action in three and four dimensions
- 2002
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Ingår i: Physical Review D (Particles and Fields). - 0556-2821. ; 66:9
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Tidskriftsartikel (refereegranskat)abstract
- We calculate the one-loop effective action of the SU(2) Yang-Mills theory for center-vortex configurations, both in 3D and 4D. We find that in both cases there are minima of the effective action, corresponding to vortices of the transverse size approximately 4/g(3)(2) and 1.7/Lambda((MS) over bar), respectively. The values of the effective actions at the minima are negative, suggesting that the Euclidian vacuum may be unstable with respect to the creation of vortices.
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| 4. |
- Hild, K., et al.
(författare)
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Magnetic Circular Dichroism in Two-Photon Photoemission
- 2009
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Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 102:5, s. 057207-
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Tidskriftsartikel (refereegranskat)abstract
- We report the observation of magnetic circular dichroism (MCD) in two-photon photoemission (2PPE). The Heusler alloys Ni2MnGa and Co2FeSi were investigated by excitation with femtosecond laser light, showing MCD asymmetries of A = (3.5 +/- 0.5) x 10(-3) for Ni2MnGa and of A = (2.1 +/- 1.0) x 10(-3) for Co2FeSi, respectively. A theoretical explanation is provided based on local spin-density calculations for the magnetic dichroic response; the computed 2PPE MCD agrees well with the experiment. The observed 2PPE magnetic contrast represents an interesting alternative for future time-resolved photoemission studies on surface magnetism practicable in the laboratory.
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| 5. |
- Kwiecinski, J, et al.
(författare)
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Integral equation for spin dependent unintegrated parton distributions incorporating double In-2(1/x) effects at low x
- 2003
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Ingår i: Physical Review D (Particles and Fields). - 0556-2821. ; 67:3: 034014
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Tidskriftsartikel (refereegranskat)abstract
- In this paper we derive an integral equation for the evolution of unintegrated (longitudinally) polarized quark and gluon parton distributions. The conventional Catani-Ciafaloni-Fiorani-Marchesini (CCFM) framework is modified at small x in order to incorporate the QCD expectations concerning the double ln(2)(1/x) resummation at low x for the integrated distributions. Complete Altarelli-Parisi splitting functions are included that makes the formalism compatible with the leading order Altarelli-Parisi evolution at large and moderately small values of x. The obtained modified polarized CCFM equation is shown to be partially diagonalized by the Fourier-Bessel transformation. Results of the numerical solution for this modifed polarized CCFM equation for the nonsinglet quark distributions are presented.
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| 6. |
- Maul, Martin
(författare)
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Polarized version of the CCFM equation for gluons
- 2002
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Ingår i: Physical Review D (Particles and Fields). - 0556-2821. ; 65:9
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Tidskriftsartikel (refereegranskat)abstract
- A derivation for a polarized CCFM evolution equation which is suitable to describe the scaling behavior of the unintegrated polarized gluon density is given. We discuss the properties of this polarized CCFM equation and compare it to the standard CCFM equation in the unpolarized case.
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