Search

Your search keyword '"Hejkenskjöld, Lena"' showing total 19 results
Start Over Author "Hejkenskjöld, Lena"
19 results on '"Hejkenskjöld, Lena"'

1. The WASA focussing light guide disc DIRC

Author

Föhl, K, Düren, M, Koch, P, Zühlsdorf, M, Adlarson, Patrik, Calén, Hans, Fransson, Kjell, Gullström, Carl-Oscar, Hejkenskjöld, Lena, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Kupsc, Andrzej, Leupold, Stefan, Marciniewski, Pawel, Redmer, Christoph, Wolke, Magnus, Zlomanczuk, Jozef, Föhl, K, Düren, M, Koch, P, Zühlsdorf, M, Adlarson, Patrik, Calén, Hans, Fransson, Kjell, Gullström, Carl-Oscar, Hejkenskjöld, Lena, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Kupsc, Andrzej, Leupold, Stefan, Marciniewski, Pawel, Redmer, Christoph, Wolke, Magnus, and Zlomanczuk, Jozef

Abstract

Two Disc DIRC prototypes have been designed and built and are shortly being tested with proton test beams. Different in design details, both aim to provide the WASA-at-COSY experiment with a particle velocity measurement that improves the missing mass resolution. This paper shows the difference in concept between these two designs and also compares to designs that have been proposed for PANDA., WASA at COSY collaboration

Published
2012
Full Text
View/download PDF

2. Study of charge symmetry breaking in dd collisions with WASA-at-COSY

Author

Wronska, Aleksandra, Adlarson, Patrik, Calén, Hans, Fransson, Kjell, Gullström, Carl-Oscar, Hejkenskjöld, Lena, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Kupsc, Andrzej, Leupold, Stefan, Marciniewski, Pawel, Redmer, Christoph, Wolke, Magnus, Zlomanczuk, Jozef, Wronska, Aleksandra, Adlarson, Patrik, Calén, Hans, Fransson, Kjell, Gullström, Carl-Oscar, Hejkenskjöld, Lena, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Kupsc, Andrzej, Leupold, Stefan, Marciniewski, Pawel, Redmer, Christoph, Wolke, Magnus, and Zlomanczuk, Jozef

Abstract

WASA at COSY collaboration

Published
2011
Full Text
View/download PDF

3. MEASUREMENT OF dd -> (3)He p pi(-) WITH WASA-at-COSY

Author

Weglorz, Wojciech, Adlarson, Patrik, Calén, Hans, Fransson, Kjell, Gullström, Carl-Oscar, Hejkenskjöld, Lena, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Kupsc, Andrzej, Leupold, Stefan, Marciniewski, Pawel, Redmer, Christoph, Wolke, Magnus, Zlomanczuk, Jozef, Weglorz, Wojciech, Adlarson, Patrik, Calén, Hans, Fransson, Kjell, Gullström, Carl-Oscar, Hejkenskjöld, Lena, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Kupsc, Andrzej, Leupold, Stefan, Marciniewski, Pawel, Redmer, Christoph, Wolke, Magnus, and Zlomanczuk, Jozef

Abstract

The measurment of the charge symmetry conserving reactions dd -> (3)He p pi(-) and dd -> (3)He n pi(0) is the first step of the charge symmetry breaking physics program with WASA-at-COSY. The analysis of these channels helps to understand the experimental conditions and provides additional parameters for theoretical studies. The data have been collected in November 2007., WASA at COSY collaboration

Published
2011
Full Text
View/download PDF

4. STUDIES OF MESON PRODUCTION AND DECAYS IN pd -> (3)He X WITH WASA-at-COSY

Author

Jany, Anna, Adlarson, Patrik, Calén, Hans, Fransson, Kjell, Gullström, Carl-Oscar, Hejkenskjöld, Lena, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Kupsc, Andrzej, Leupold, Stefan, Marciniewski, Pawel, Redmer, Christoph, Wolke, Magnus, Zlomanczuk, Jozef, Jany, Anna, Adlarson, Patrik, Calén, Hans, Fransson, Kjell, Gullström, Carl-Oscar, Hejkenskjöld, Lena, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Kupsc, Andrzej, Leupold, Stefan, Marciniewski, Pawel, Redmer, Christoph, Wolke, Magnus, and Zlomanczuk, Jozef

Abstract

Studies of meson production in the pd -> (3)He X reaction, where X = eta, eta' and omega, and their decays are investigated with the WASA-at-COSY facility. The angular distribution of the eta in the center of mass of the (3)He-eta system, have been measured at an excess energy of Q = 61 MeV over the full angular range. The anisotropy expected at the relatively large Q is observed., WASA at COSY collaboration

Published
2011
Full Text
View/download PDF

5. CHARGE SYMMETRY BREAKING IN dd -> (4)He pi(0) WITH WASA-at-COSY

Author

Hejny, Volker, Adlarson, Patrik, Calén, Hans, Fransson, Kjell, Gullström, Carl-Oscar, Hejkenskjöld, Lena, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Kupsc, Andrzej, Leupold, Stefan, Marciniewski, Pawel, Redmer, Christoph, Wolke, Magnus, Zlomanczuk, Jozef, Hejny, Volker, Adlarson, Patrik, Calén, Hans, Fransson, Kjell, Gullström, Carl-Oscar, Hejkenskjöld, Lena, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Kupsc, Andrzej, Leupold, Stefan, Marciniewski, Pawel, Redmer, Christoph, Wolke, Magnus, and Zlomanczuk, Jozef

Abstract

Charge symmetry breaking effects can be used as an experimental tool to study quark mass effects. Using recent high precision data from TRIUMF and IUCF an international theory collaboration is working on a consistent description within the framework of chiral pertubation theory. The WASA-at-COSY collaboration has started an experimental program extending the studies on the reaction dd -> (4)He pi(0) towards higher excess energies in order to provide necessary information on the contribution of p-waves. First preliminary results on the total cross section at Q = 60 MeV are presented., WASA at COSY collaboration

Published
2011
Full Text
View/download PDF

6. STUDY OF THE eta -> gamma e(+)e(-) DECAY WITH THE WASA-at-COSY

Author

Hodana, Malcorzata, Adlarson, Patrik, Calén, Hans, Fransson, Kjell, Gullström, Carl-Oscar, Hejkenskjöld, Lena, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Kupsc, Andrzej, Leupold, Stefan, Marciniewski, Pawel, Redmer, Christoph, Wolke, Magnus, Zlomanczuk, Jozef, Hodana, Malcorzata, Adlarson, Patrik, Calén, Hans, Fransson, Kjell, Gullström, Carl-Oscar, Hejkenskjöld, Lena, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Kupsc, Andrzej, Leupold, Stefan, Marciniewski, Pawel, Redmer, Christoph, Wolke, Magnus, and Zlomanczuk, Jozef

Abstract

In October 2008, the WASA-at-COSY collected more than 10(7) events for the pd -> (3)He eta reaction. The aim is the determination of the invariant mass of the lepton pairs created in the Dalitz decay eta -> gamma e(+)e(-). The e(+)e(-) invariant mass spectrum is directly related to the distribution of the four-momentum squared of the virtual photon from the eta -> gamma gamma* process and hence it allows for the study of the transition form factor which in turn reflects the structure of the decaying meson., WASA at COSY collaboration

Published
2011
Full Text
View/download PDF

7. SEARCH FOR EXOTIC EFFECTS IN eta MESON LEPTONIC DECAYS

Author

Berlowski, Marcin, Adlarson, Patrik, Calén, Hans, Fransson, Kjell, Gullström, Carl-Oscar, Hejkenskjöld, Lena, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Kupsc, Andrzej, Leupold, Stefan, Marciniewski, Pawel, Redmer, Christoph, Wolke, Magnus, Zlomanczuk, Jozef, Berlowski, Marcin, Adlarson, Patrik, Calén, Hans, Fransson, Kjell, Gullström, Carl-Oscar, Hejkenskjöld, Lena, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Kupsc, Andrzej, Leupold, Stefan, Marciniewski, Pawel, Redmer, Christoph, Wolke, Magnus, and Zlomanczuk, Jozef

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., WASA at COSY collaboration

Published
2011
Full Text
View/download PDF

8. INVESTIGATION OF THE CHARGE SYMMETRY CONSERVING REACTION dd -> (3)He n pi(0) WITH WASA-at-COSY

Author

Podkopal, Pawel, Adlarson, Patrik, Calén, Hans, Fransson, Kjell, Gullström, Carl-Oscar, Hejkenskjöld, Lena, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Kupsc, Andrzej, Leupold, Stefan, Marciniewski, Pawel, Redmer, Christoph, Wolke, Magnus, Zlomanczuk, Jozef, Podkopal, Pawel, Adlarson, Patrik, Calén, Hans, Fransson, Kjell, Gullström, Carl-Oscar, Hejkenskjöld, Lena, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Kupsc, Andrzej, Leupold, Stefan, Marciniewski, Pawel, Redmer, Christoph, Wolke, Magnus, and Zlomanczuk, Jozef

Abstract

One of the key experiments of the physics program of WASA-at-COSY is the determination of the p- wave contributions to the Charge Symmetry breaking amplitude in the reaction dd -> (4)He pi(0) at 1.2 GeV/c beam momentum. As a first step towards realisation of this goal the Charge Symmetry conserving reaction dd -> (3)Hen pi(0) was measured. For an overall theoretical analysis of CSB reactions in terms of Chiral Perturbation Theory this reaction channel will be used to gain information on the deuteron-deuteron initial state interaction for s- and p- wave pion production., WASA at COSY collaboration

Published
2011
Full Text
View/download PDF

9. LEADING MODES OF 3 pi(0) PRODUCTION IN PROTON-PROTON COLLISIONS AT INCIDENT PROTON MOMENTUM 3.35 GeV/c

Author

Jany, Benedykt R., Adlarson, Patrik, Calén, Hans, Fransson, Kjell, Gullström, Carl-Oscar, Hejkenskjöld, Lena, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Kupsc, Andrzej, Leupold, Stefan, Marciniewski, Pawel, Redmer, Christoph, Wolke, Magnus, Zlomanczuk, Jozef, Jany, Benedykt R., Adlarson, Patrik, Calén, Hans, Fransson, Kjell, Gullström, Carl-Oscar, Hejkenskjöld, Lena, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Kupsc, Andrzej, Leupold, Stefan, Marciniewski, Pawel, Redmer, Christoph, Wolke, Magnus, and Zlomanczuk, Jozef

Abstract

For the first time pp -> pp3 pi(0) has been measured at an incident proton momentum of P(b)=3.35GeV/c. The total cross section has been determined. The reaction mechanism is studied by a Dalitz plot analyses, which indicate that the leading production and decay mechanism is closely related to the simultaneous excitation of Delta(1232) and N*(1440) baryon resonances.

Published
2011
Full Text
View/download PDF

10. Design of a disc DIRC detector for the WASA experiment

Author

Föhl, K., Adlarson, Patrik, Calén, Hans, Fransson, Kjell, Gullström, Carl-Oscar, Hejkenskjöld, Lena, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Kupsc, Andrzej, Leupold, Stefan, Marciniewski, Pawel, Redmer, Christoph, Wolke, Magnus, Zlomanczuk, Jozef, Föhl, K., Adlarson, Patrik, Calén, Hans, Fransson, Kjell, Gullström, Carl-Oscar, Hejkenskjöld, Lena, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Kupsc, Andrzej, Leupold, Stefan, Marciniewski, Pawel, Redmer, Christoph, Wolke, Magnus, and Zlomanczuk, Jozef

Abstract

WASA at COSY collaboration

Published
2011
Full Text
View/download PDF

11. WHAT IS THE NATURE OF THE ABC EFFECT?

Author

Bashkanov, M., Clement, H., Adlarson, Patrik, Calén, Hans, Fransson, Kjell, Gullström, Carl-Oscar, Hejkenskjöld, Lena, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Kupsc, Andrzej, Leupold, Stefan, Marciniewski, Pawel, Redmer, Christoph, Wolke, Magnus, Zlomanczuk, Jozef, Bashkanov, M., Clement, H., Adlarson, Patrik, Calén, Hans, Fransson, Kjell, Gullström, Carl-Oscar, Hejkenskjöld, Lena, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Kupsc, Andrzej, Leupold, Stefan, Marciniewski, Pawel, Redmer, Christoph, Wolke, Magnus, and Zlomanczuk, Jozef

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.

Published
2011
Full Text
View/download PDF

12. Meson Production and Decays with WASA at COSY

Author

Schadmand, Susan, Adlarson, Patrik, Calén, Hans, Fransson, Kjell, Gullström, Carl-Oscar, Hejkenskjöld, Lena, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Kupsc, Andrzej, Leupold, Stefan, Marciniewski, Pawel, Redmer, Christoph, Wolke, Magnus, Zlomanczuk, Jozef, Schadmand, Susan, Adlarson, Patrik, Calén, Hans, Fransson, Kjell, Gullström, Carl-Oscar, Hejkenskjöld, Lena, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Kupsc, Andrzej, Leupold, Stefan, Marciniewski, Pawel, Redmer, Christoph, Wolke, Magnus, and Zlomanczuk, Jozef

Abstract

WASA at COSY collaboration

Published
2011
Full Text
View/download PDF

13. Measurement of the branching ratio of a rare decay η→π0γγ with WASA‐at‐COSY

Author

Lalwani, Kavita, Adlarson, Patrik, Calén, Hans, Fransson, Kjell, Gullström, Carl-Oscar, Hejkenskjöld, Lena, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Kupsc, Andrzej, Leupold, Stefan, Marciniewski, Pawel, Redmer, Christoph, Wolke, Magnus, Zlomanczuk, Jozef, Lalwani, Kavita, Adlarson, Patrik, Calén, Hans, Fransson, Kjell, Gullström, Carl-Oscar, Hejkenskjöld, Lena, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Kupsc, Andrzej, Leupold, Stefan, Marciniewski, Pawel, Redmer, Christoph, Wolke, Magnus, and Zlomanczuk, Jozef

Abstract

WASA at COSY collaboration

Published
2011
Full Text
View/download PDF

14. Search for the η → e+e−e+e−ˆ’ double Dalitz decay

Author

Wurm, Patrick, Adlarson, Patrik, Calén, Hans, Fransson, Kjell, Gullström, Carl-Oscar, Hejkenskjöld, Lena, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Kupsc, Andrzej, Leupold, Stefan, Marciniewski, Pawel, Redmer, Christoph, Wolke, Magnus, Zlomanczuk, Jozef, Wurm, Patrick, Adlarson, Patrik, Calén, Hans, Fransson, Kjell, Gullström, Carl-Oscar, Hejkenskjöld, Lena, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Kupsc, Andrzej, Leupold, Stefan, Marciniewski, Pawel, Redmer, Christoph, Wolke, Magnus, and Zlomanczuk, Jozef

Abstract

The Wide Angle Shower Apparatus (WASA) operated at the Cooler Synchrotron COSY-JÌlich is a 4p-spectrometer to study the decay channels of light mesons ranging up into the strange quark sector. A large number of η mesons is being produced in proton-deuteron and proton-proton reactions, permitting the study of very rare η -decay channels. One of the channels is the double Dalitz decay, where the η meson decays via two virtual photons into two electron-positron pairs. The coupling between the η meson and the two virtual photons can be described by the transition form factor. It depends on the squared invariant mass of the lepton pairs and allows to study the structure of the decay mechanism. Currently, there is only an experimental upper limit for the branching ratio. One objective of the WASA-at-COSY experiment is to reduce the upper limit for this decay channel or to determine a finite value of the branching ratio. The goal is to study the transition form factor. The status of the continuing analysis and preliminary results are presented., WASA at COSY collaboration

Published
2011

15. Studies of meson production and decays in pd -> 3HeX with WASA-at-COSY

Author

Jany, A., Adlarson, Patrik, Calén, Hans, Fransson, Kjell, Gullström, Carl-Oscar, Hejkenskjöld, Lena, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Kupsc, Andrzej, Leupold, Stefan, Marciniewski, Pawel, Redmer, Christoph, Wolke, Magnus, Zlomanczuk, Jozef, Jany, A., Adlarson, Patrik, Calén, Hans, Fransson, Kjell, Gullström, Carl-Oscar, Hejkenskjöld, Lena, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Kupsc, Andrzej, Leupold, Stefan, Marciniewski, Pawel, Redmer, Christoph, Wolke, Magnus, and Zlomanczuk, Jozef

Abstract

WASA at COSY collaboration

Published
2011

16. Experimental study of ppη dynamics with WASA-at-COSY

Author

Shah, Neha, Adlarson, Patrik, Calén, Hans, Fransson, Kjell, Gullström, Carl-Oscar, Hejkenskjöld, Lena, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Kupsc, Andrzej, Leupold, Stefan, Marciniewski, Pawel, Redmer, Christoph, Wolke, Magnus, Zlomanczuk, Jozef, Shah, Neha, Adlarson, Patrik, Calén, Hans, Fransson, Kjell, Gullström, Carl-Oscar, Hejkenskjöld, Lena, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Kupsc, Andrzej, Leupold, Stefan, Marciniewski, Pawel, Redmer, Christoph, Wolke, Magnus, and Zlomanczuk, Jozef

Abstract

WASA at COSY collaboration

Published
2011
Full Text
View/download PDF

17. A Trigger System Based on Fast Sampling ADCs - Implementation and Tests

Author

Marciniewski, Pawel, Pluciniski, Pawel, Fransson, Kjell, Hejkenskjöld, Lena, Kupsc, Andrzej, Zlomanczuk, Jozef, Wolke, Magnus, Calén, Hans, Johansson, Tord, Höistad, Bo, Erven, W., Wuestner, P., Kleines, H., Hejny, V., Coderre, D., Marciniewski, Pawel, Pluciniski, Pawel, Fransson, Kjell, Hejkenskjöld, Lena, Kupsc, Andrzej, Zlomanczuk, Jozef, Wolke, Magnus, Calén, Hans, Johansson, Tord, Höistad, Bo, Erven, W., Wuestner, P., Kleines, H., Hejny, V., and Coderre, D.

Published
2011

18. Leading Modes of 3pi0 production in proton-proton collisions at incident proton momentum of 3.35 GeV/c

Author

Benedykt, R. Jany, Adlarson, Patrik, Calén, Hans, Fransson, Kjell, Gullström, Carl-Oscar, Hejkenskjöld, Lena, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Kupsc, Andrzej, Leupold, Stefan, Marciniewski, Pawel, Redmer, Christoph, Wolke, Magnus, Zlomanczuk, Jozef, Benedykt, R. Jany, Adlarson, Patrik, Calén, Hans, Fransson, Kjell, Gullström, Carl-Oscar, Hejkenskjöld, Lena, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Kupsc, Andrzej, Leupold, Stefan, Marciniewski, Pawel, Redmer, Christoph, Wolke, Magnus, and Zlomanczuk, Jozef

Abstract

WASA at COSY collaboration

Published
2011

19. Measurement of the transition form factor of η meson with WASA-at-COSY

Author

Bhatt, H., Adlarson, Patrik, Calén, Hans, Fransson, Kjell, Gullström, Carl-Oscar, Hejkenskjöld, Lena, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Kupsc, Andrzej, Leupold, Stefan, Marciniewski, Pawel, Redmer, Christoph, Wolke, Magnus, Zlomanczuk, Jozef, Bhatt, H., Adlarson, Patrik, Calén, Hans, Fransson, Kjell, Gullström, Carl-Oscar, Hejkenskjöld, Lena, Höistad, Bo, Jacewicz, Marek, Johansson, Tord, Kupsc, Andrzej, Leupold, Stefan, Marciniewski, Pawel, Redmer, Christoph, Wolke, Magnus, and Zlomanczuk, Jozef

Abstract

WASA at COSY collaboration

Published
2011
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results