| 1. |
- Abelev, B., et al.
(författare)
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Performance of the ALICE experiment at the CERN LHC
- 2014
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Ingår i: International Journal of Modern Physics A. - 0217-751X. ; 29:24
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Forskningsöversikt (refereegranskat)abstract
- ALICE is the heavy-ion experiment at the CERN Large Hadron Collider. The experiment continuously took data during the first physics campaign of the machine from fall 2009 until early 2013, using proton and lead-ion beams. In this paper we describe the running environment and the data handling procedures, and discuss the performance of the ALICE detectors and analysis methods for various physics observables.
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| 2. |
- Adlarson, Patrick, et al.
(författare)
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MEASUREMENT OF THE eta -> pi(+)pi(-)pi(0) DECAY WITH WASA-at-COSY DETECTOR
- 2011
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Ingår i: International Journal of Modern Physics A. - 0217-751X .- 1793-656X. ; 26:3-4, s. 622-624
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Tidskriftsartikel (refereegranskat)abstract
- One of the objectives of the physics programme of the WASA-at-COSY facility is to study the isospin violating eta hadronic decays into pi(+)pi(-)pi(0) systems driven by the term of QCD Lagrangian which depends on the d and u quark mass difference. These studies can be made in terms of the Dalitz plot parameters describing the density population which is proportional to the square of the amplitude vertical bar A(x,y)vertical bar(2). This contribution describes the current status of the analysis of the eta -> pi(+)pi(-)pi(0) decay in the pd ->(3) He eta and as well in the pp -> pp eta reaction with WASA-at-COSY.
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| 3. |
- Andrés, E., et al.
(författare)
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Recent results from AMANDA
- 2001
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Ingår i: International Journal of Modern Physics A. - 0217-751X .- 1793-656X. ; 16:1C, s. 1013-1015
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Tidskriftsartikel (refereegranskat)abstract
- We present results based on data taken in 1997 with the 302-PMT Antarctic Muon and Neutrino Detector Array-B10 ("AMANDA-B10") array. Atmospheric neutrinos created in the northern hemisphere are observed indirectly through their charged current interactions which produce relativistic, Cherenkov-light-emitting upgoing muons in the South Pole ice cap. The reconstructed angular distribution of these events is in good agreement with expectation and demonstrates the viability of this ice-based device as a neutrino telescope.
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| 4. |
- Aydemir, Ufuk, et al.
(författare)
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Pati-Salam unification from noncommutative geometry and the TeV-scale W-R boson
- 2016
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Ingår i: International Journal of Modern Physics A. - 0217-751X .- 1793-656X. ; 31:1
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Tidskriftsartikel (refereegranskat)abstract
- We analyze the compatibility of the unified left-right symmetric Pati-Salam models motivated by noncommutative geometry and the TeV-scale right-handed W boson suggested by recent LHC data. We find that the unification/matching conditions place conflicting demands on the symmetry breaking scales and that generating the required W-R mass and coupling is nontrivial.
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| 5. |
- Aydemir, Ufuk
(författare)
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SO(10) grand unification in light of recent LHC searches and colored scalars at the TeV-scale
- 2016
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Ingår i: International Journal of Modern Physics A. - 0217-751X .- 1793-656X. ; 31:8
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Tidskriftsartikel (refereegranskat)abstract
- We analyze the compatibility of the recent LHC signals and the TeV-scale left right model(s) in the minimal nonsupersymmetric SO(10) framework. We show that the models in which the Higgs content is selected based on the extended survival hypothesis do not allow the W-R boson to be at the TeV-scale. By relaxing this conjecture, we investigate various scenarios where a number of colored-scalars, originated from various Pati-Salam multiplets, are light and whence they survive down to the low energies. Performing a detailed renormalization group analysis with various low-energy Higgs configurations and symmetry breaking chains, while keeping the high energy Higgs content unmodified; we find that, among a number of possibilities, the models which have a light color-triplet scalar, and its combination with a light color-sextet, particularly stand out. Although these models do allow a TeV-scale W-R boson, generating the required value of the gauge coupling g(R) at this scale is nontrivial.
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| 6. |
- Babaev, Egor
(författare)
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Nonlinear sigma model approach for phase disorder transitions in chiral Gross-Neveu, Nambu-Jona-Lasinio models and strong-coupling superconductors
- 2001
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Ingår i: International Journal of Modern Physics A. - 0217-751X .- 1793-656X. ; 16:7, s. 1175-1197
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Forskningsöversikt (refereegranskat)abstract
- We briefly review the nonlinear sigma model approach for the subject of increasing interest: two-step phase transitions in the Gross-Neveu and the modified Nambu-Jona-Lasinio models at low N and condensation from pseudogap phase in strong-coupling superconductors. Recent success in describing of Bose-type superconductors that possess two characteristic temperatures and a pseudogap above T, is the develop ment approximately comparable with the BCS theory. One can expect that it should have influence on high-energy physics, similar to impact of the BCS theory on this subject. Although first generalizations of this concept to particle physics were made recently, these results were not systematized. In this review we summarize this development and discuss similarities and differences of the appearance of the pseudogap phase in superconductors and the Gross-Neveu and Nambu-Jona-Lasinio-like models. We discuss its possible relevance for chiral phase transition in QCD and color superconductors. This paper is organized in three parts. In the first part, we briefly review the separation of temperatures of pair formation and pair condensation in strong-coupling and low carrier density superconductors (i.e. the formation of the pseudogap phase). The second part is a review of nonlinear sigma model approach to an analogous phenomenon in the chiral Gross-Neveu model at small N. In the third part we discuss the modified Nambu-Jona-Lasinio model where the chiral phase transition is accompanied by a formation of a phase analogous to the pseudogap phase.
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| 7. |
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| 8. |
- Badelek, B, et al.
(författare)
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The photon collider at TESLA
- 2004
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Ingår i: International Journal of Modern Physics A. - 0217-751X. ; 19:30, s. 5097-5186
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Forskningsöversikt (refereegranskat)abstract
- High energy photon colliders (gammagamma,gammae) are based on e(-)e(-) linear colliders where high energy photons are produced using Compton scattering of laser light on high energy electrons just before the interaction point. This paper is a part of the Technical Design Report of the linear collider TESLA.(1) Physics program, possible parameters and some technical aspects of the photon collider at TESLA are discussed.
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| 9. |
- Bashkanov, M., et al.
(författare)
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Low-mass pi pi enhancement in baryonic pi pi production : ABC effect revised by exclusive measurements
- 2007
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Ingår i: International Journal of Modern Physics A. - 0217-751X .- 1793-656X. ; 22:2-3, s. 625-628
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Tidskriftsartikel (refereegranskat)abstract
- The ABC effect - a puzzling threshold enhancement in the ππ invariant mass spectrum of double-pionic fusion to nuclear bound states - has been investigated since 40 years by inclusive measurements without providing a conclusive interpretation. First exclusive measurements to this topic have now been carried out at CELSIUS-WASA. They confirm a huge ππ threshold enhancement, prove it to be of scalar-isoscalar nature, i.e., a σ-channel phenomenon and reveal the theoretically predicted high-mass enhancement in inclusive spectra to be of πππ rather than of ππ nature - falsifying thus corresponding model predictions for the ABC effect. From the kinematically complete data samples we infer that the interaction between the two Δ particles created in this process is of crucial importance.
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| 10. |
- Bashkanov, M., et al.
(författare)
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WHAT IS THE NATURE OF THE ABC EFFECT?
- 2011
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Ingår i: International Journal of Modern Physics A. - 0217-751X .- 1793-656X. ; 26:3-4, s. 627-629
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Tidskriftsartikel (refereegranskat)abstract
- The ABC effect - an intriguing low-mass enhancement in the pi pi invariant mass spectrum - is known from inclusive measurements of two-pion production in nuclear fusion reactions. Exclusive measurements have been carried out at CELSIUS/WASA and WASA-at-COSY for the fusion reactions leading to d, (3)He and (4)He. They all reveal this effect to be of isoscalar nature and associated with a narrow Lorentzian-shaped structure in the total cross section. The latter could point to the formation of an isoscalar resonance, which couples to the pn channel as well as to an intermediate Delta Delta state.
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| 11. |
- Bergqvist, Göran
(författare)
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Causal tensors and simple forms
- 2002
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Ingår i: International Journal of Modern Physics A. - 0217-751X .- 1793-656X. ; 17:20, s. 2748-2748
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Tidskriftsartikel (refereegranskat)
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| 12. |
- Berlowski, Marcin, et al.
(författare)
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SEARCH FOR EXOTIC EFFECTS IN eta MESON LEPTONIC DECAYS
- 2011
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Ingår i: International Journal of Modern Physics A. - 0217-751X .- 1793-656X. ; 26:3-4, s. 630-631
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Tidskriftsartikel (refereegranskat)abstract
- The search for the decay eta -> e(+)e(-) was carried out using the WASA detector at the COSY storage ring. Data were taken during a two week experimental run in Sept-Nov 2008 in which about 10(7) eta mesons were collected from the reaction of pp -> pp eta at energy of 1.4 GeV. Background studies were performed for several different reactions. The performance of the WASA detector for the measurement of electron-positron pairs based on the single Dalitz decay of the eta meson was studied. We also identified a statistically significant data sample of other more frequent leptonic decays.
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| 13. |
- Bijnens, Johan
(författare)
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Chiral Lagrangians
- 2002
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Ingår i: INTERNATIONAL JOURNAL OF MODERN PHYSICS A. - 0217-751X. ; 17:23, s. 3154-3169
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Konferensbidrag (refereegranskat)abstract
- An overview of the field of Chiral Lagrangians is given. This includes Chiral Perturbation Theory and resummations to extend, it to higher energies, applications to the muon anomalous magnetic moment, epsilon(1)/epsilon and others.
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| 14. |
- Bordag, Ljudmila A.
(författare)
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Symmetry reductions and exact solutions for nonlinear diffusion equations
- 2009
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Ingår i: International Journal of Modern Physics A. - Singapore : World Scientific. - 0217-751X .- 1793-656X. ; 24:8/9, s. 1713-1716
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Tidskriftsartikel (refereegranskat)abstract
- The symmetry properties of nonlinear diffusion equations are studied using a Lie group analysis. Reductions and families of exact solutions are found for some of these equations.© 2009 World Scientific Publishing Company.
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| 15. |
- Bordag, Michael, et al.
(författare)
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Analytic corrections to the electromagnetic casimir interaction between a sphere and a plate at shortdistances
- 2010
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Ingår i: International Journal of Modern Physics A. - Singapore : World Scientific. - 0217-751X .- 1793-656X. ; 25:11, s. 2171-2176
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Tidskriftsartikel (refereegranskat)abstract
- For the vacuum interaction of asphere in front of a plane,both obeying conductor boundary conditions, we consider the approximation of small separation. We derive the next-to-leading order of the asymptotic expansion in the separation-to-radius ratio epsilon. This correction is of order epsilon. In opposite to the scalar cases it contains also contributions proportional to logarithms in first and second order, epsilon ln epsilon and epsilon(ln epsilon)(2). We compare this result with the available findings of numerical and experimental approaches.
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| 16. |
- Bordag, Michael, et al.
(författare)
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Beyond proximity force approximation in the casimir effect
- 2009
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Ingår i: International Journal of Modern Physics A. - Singapore : World Scientific. - 0217-751X .- 1793-656X. ; 24:8-9, s. 1743-1747
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Tidskriftsartikel (refereegranskat)abstract
- We compare the analytical and numerical results for the Casimir force for the configuration of a plane and a cylinder in front of a plane. While for Dirichlet boundary conditions on both, plane and sphere or cylinder, agreement is found, for Neumann boundary conditions on either the plane or one of the two, cylinder or sphere, disagreement is found. This holds, for a sphere, also for different boundary conditions on the interacting surfaces. From recent, new numerical results for the cylinder, a general appearance of logarithmic contributions beyond PFA can be predicted.
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| 17. |
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| 18. |
- Brink, Lars, 1943
(författare)
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Stanley Mandelstam and me and life on the light-cone
- 2017
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Ingår i: International Journal of Modern Physics A. - 0217-751X. ; 32:1
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Tidskriftsartikel (refereegranskat)abstract
- Stanley Mandelstam has always been one of my heroes in physics. Here I will describe my meetings with Stanley over the years and how our respective work sometimes coincided.
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| 19. |
- Carlson, Per
(författare)
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PAMELA science
- 2005
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Ingår i: International Journal of Modern Physics A. - 0217-751X .- 1793-656X. ; 20:29, s. 6731-6734
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Tidskriftsartikel (refereegranskat)abstract
- The PAMELA satellite-borne experimenti, to be launched in 2005, is a powerful spectrometer including a magnetic field tracker and particle identification detectors. PAMELA science is broad and includes studies of interstellar propagation, solar modulation and search for dark matter signals.
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| 20. |
- Di Vecchia, Paolo
(författare)
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My interaction with Stanley
- 2017
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Ingår i: International Journal of Modern Physics A. - : World Scientific. - 0217-751X .- 1793-656X. ; 32:12
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Tidskriftsartikel (refereegranskat)
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| 21. |
- Dunin-Barkowski, Petr, et al.
(författare)
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Evolution for Khovanov polynomials for figure-eight-like family of knots
- 2022
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Ingår i: International Journal of Modern Physics A. - : World Scientific Pub Co Pte Ltd. - 0217-751X .- 1793-656X. ; 37:36
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Tidskriftsartikel (refereegranskat)abstract
- We look at how evolution method deforms, when one considers Khovanov polynomials instead of Jones polynomials. We do this for the figure-eight-like knots (also known as 'double braid' knots, see arXiv:1306.3197) -- a two-parametric family of knots which "grows" from the figure-eight knot and contains both two-strand torus knots and twist knots. We prove that parameter space splits into four chambers, each with its own evolution, and two isolated points. Remarkably, the evolution in the Khovanov case features an extra eigenvalue, which drops out in the Jones (t -> -1) limit.
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| 22. |
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| 23. |
- Euler, Marianna, et al.
(författare)
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Explicitly space- and time-dependent d'Alembert equations with symmetries
- 1999
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Ingår i: International Journal of Modern Physics A. - 0217-751X .- 1793-656X. ; 14:26, s. 4189-4200
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Tidskriftsartikel (refereegranskat)abstract
- The general d'Alembert equation $\square u+ f(x_0, x_1,u)= 0$ is considered, where $\square$ is the two-dimensional d'Alembert operator. We classify the equation for functions $f$ by which it admits several Lie symmetry algebras, which include the Lorentz symmetry generator. The corresponding symmetry reductions are listed.
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| 24. |
- Fransson, Kjell
(författare)
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Status of wasa at cosy
- 2007
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Ingår i: International Journal of Modern Physics A. - 0217-751X .- 1793-656X. ; 22:2-3, s. 570-573
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Tidskriftsartikel (refereegranskat)abstract
- The WASA detector built and operated at the storage ring CELSIUS in Uppsala, was during 2005 moved to the COoler SYnchrotron COSY in Julich where it is now being reassembled. The main physics concerns decays of eta and eta' mesons and isospin violation in deuteron-deuteron interactions. Several modifications and upgrades are planned to adapt the WASA detector to the COSY environment and beam energy. The first commissioning run is scheduled to start August 2006. Here we report on the status of the installation work and upgrades planned for the WASA detector at COSY.
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| 25. |
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