Search

Your search keyword '"A. Budzanowski"' showing total 86 results
Start Over Author "A. Budzanowski" Topic high energy physics::experiment
86 results on '"A. Budzanowski"'

1. Hadron fluence measurements with LiF-TLD sensors at the proton synchrotron accelerator at CERN

Author

Barbara Obryk, Maciej Budzanowski, and Christoph Ilgner

Subjects
Accelerator Physics (physics.acc-ph), Physics - Instrumentation and Detectors, Proton, Physics::Instrumentation and Detectors, Physics::Medical Physics, FOS: Physical sciences, Proton Synchrotron, Synchrotron radiation, Thermoluminescence, High Energy Physics - Experiment, law.invention, Nuclear physics, High Energy Physics - Experiment (hep-ex), law, Nuclear Experiment, Instrumentation, Physics, Radiation, Large Hadron Collider, Particle accelerator, Instrumentation and Detectors (physics.ins-det), Surface coating, Physics::Accelerator Physics, Physics - Accelerator Physics, High Energy Physics::Experiment, Thermoluminescent dosimeter
Abstract

In view of the implementation of beam-monitoring sensors for CERN's Large Hadron Collider (LHC), and also in order to validate Thermoluminescence Detectors as a versatile tool to measure ionizing radiation doses in mixed fields at hadron colliders such as the LHC, chemical vapor deposition diamond sensors have been evaluated and calibrated at CERN's Proton Synchrotron accelerator. Special attention was paid to understanding whether lithiumfluoride thermoluminescence detectors are suitable as measuring devices in these radiation fields.

Published
2010

2. A threshold Cherenkov detector for separation using silica aerogel

Author

G. Vankova, J. Urban, B. J. Roy, P. von Rossen, A. Chatterjee, G. J. Wagner, A. Magiera, I. V. Slepnev, A. Budzanowski, F. Massmann, I.M. Sitnik, D. Kolev, R. Jahn, H. Clement, M. Kravcikova, F. Hinterberger, D. Protic, L. Jarczyk, R. Joosten, K. Ulbrich, R. Ziegler, Hartmut Machner, R. Siudak, K. Kilian, Di. Kirillov, J. Ernst, J. Munkel, J. Ritman, R. Tsenov, Jerzy Smyrski, S. Kliczewski, G. Martinska, P. Hawranek, N.M. Piskunov, and E. Dorochkevitsch

Subjects
Physics, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, Cherenkov detector, Nuclear Theory, Detector, Astrophysics::Instrumentation and Methods for Astrophysics, Particle identification, Particle detector, law.invention, Nuclear physics, Pion, law, High Energy Physics::Experiment, Nuclear Experiment, Instrumentation, Spectrograph, Refractive index, Cherenkov radiation
Abstract

þ ðLpÞ K þ =pþ separation abstract A new threshold Cherenkov detector has been built for the detection of charged pions in the focal plane of a magnetic spectrograph. Silica aerogel with refractive index of n ¼ 1:05 is applied as a radiator. The detector exhibits a very high detection efficiency for pions with momenta X900 MeV=c. Using two Cherenkov detectors in series a very high pion suppression factor of 10 5 was achieved.

Published
2008

3. Application of different TL detectors for the photon dosimetry in mixed radiation fields used for BNCT

Author

A. Straubing, Maciej Budzanowski, Paweł Bilski, K. Eberhardt, B. Burgkhardt, G. Hampel, R. Böttger, and Pawel Olko

Subjects
Physics, Photons, Radiation, Photon, Radiological and Ultrasound Technology, Physics::Medical Physics, Public Health, Environmental and Occupational Health, Reproducibility of Results, Boron Neutron Capture Therapy, Radiotherapy Dosage, Equipment Design, General Medicine, Photon energy, Sensitivity and Specificity, Neutron temperature, Equipment Failure Analysis, Nuclear physics, Neutron capture, Dosimetry, Thermoluminescent Dosimetry, High Energy Physics::Experiment, Radiology, Nuclear Medicine and imaging, Neutron, Thermoluminescent dosimeter
Abstract

Different approaches for the measurement of a relatively small gamma dose in strong fields of thermal and epithermal neutrons as used for Boron Neutron Capture Therapy (BNCT) have been studied with various thermoluminescence detectors (TLDs). CaF(2):Tm detectors are insensitive to thermal neutrons but not tissue-equivalent. A disadvantage of applying tissue-equivalent (7)LiF detectors is a strong neutron signal resulting from the unavoidable presence of (6)Li traces. To overcome this problem it is usual to apply pairs of LiF detectors with different (6)Li content. The experimental determination of the thermal neutron response ratio of such a pair at the Geesthacht Neutron Facility (GeNF) operated by PTB enables measurement of the photon dose. In the experimental mixed field of thermal neutrons and photons of the TRIGA reactor at Mainz the photon dose measured with different types of (7)LiF/(nat)LiF TLD pairs agree within a standard uncertainty of 6% whereas the CaF(2):Tm detectors exhibit a photon dose by more than a factor of 2 higher. It is proposed to determine suitable photon energy correction factors for CaF(2):Tm detectors with the help of the (7)LiF/(nat)LiF TLD pairs in the radiation field of interest.

Published
2006

4. Elliptic flow in Au+Au collisions at RHIC

Author

Carla M Vale, B B Back, M D Baker, M Ballintijn, D S Barton, R R Betts, A A Bickley, R Bindel, A Budzanowski, W Busza, A Carroll, M P Decowski, E García, N George, K Gulbrandsen, S Gushue, C Halliwell, J Hamblen, G A Heintzelman, C Henderson, D J Hofman, R S Hollis, R Hołyński, B Holzman, A Iordanova, E Johnson, J L Kane, J Katzy, N Khan, W Kucewicz, P Kulinich, C M Kuo, W T Lin, S Manly, D McLeod, A C Mignerey, M Ngyuen, R Nouicer, A Olszewski, R Pak, I C Park, H Pernegger, C Reed, L P Remsberg, M Reuter, C Roland, G Roland, L Rosenberg, J Sagerer, P Sarin, P Sawicki, W Skulski, P Steinberg, G S F Stephans, A Sukhanov, J-L Tang, M B Tonjes, A Trzupek, G J van Nieuwenhuizen, R Verdier, G Veres, F L H Wolfs, B Wosiek, K Woźniak, A H Wuosmaa, and B Wysłouch

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), 010308 nuclear & particles physics, Detector, Elliptic flow, FOS: Physical sciences, 01 natural sciences, 7. Clean energy, Charged particle, Nuclear physics, Azimuth, Pseudorapidity, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment, 010306 general physics, Anisotropy, Relativistic Heavy Ion Collider
Abstract

Elliptic flow is an interesting probe of the dynamical evolution of the dense system formed in the ultrarelativistic heavy ion collisions at the Relativistic Heavy Ion Collider (RHIC). The elliptic flow dependences on transverse momentum, centrality, and pseudorapidity were measured using data collected by the PHOBOS detector, which offers a unique opportunity to study the azimuthal anisotropies of charged particles over a wide range of pseudorapidity. These measurements are presented, together with an overview of the analysis methods and a discussion of the results., Comment: Presented at Hot Quarks 2004; 7 pages, 6 figures

Published
2005

5. PRODUCTION OF η MESONS IN PROTON-PROTON COLLISIONS CLOSE TO THRESHOLD

Author

T. Sefzick, H.-H. Adam, A. Khoukaz, K. Kilian, M. Siemaszko, W. Oelert, W. Zipper, Michał Janusz, Cezary Piskor-Ignatowicz, R. Czyżykiewicz, A. Täschner, R. Santo, P. Winter, J. Przerwa, T. Rożek, P. Kowina, A. Budzanowski, Paweł Klaja, Paweł Moskal, M. Wolke, D. Grzonka, Jerzy Smyrski, B. Kamys, P. Wüstner, and L. Jarczyk

Subjects
Physics, Nuclear and High Energy Physics, Meson production, Meson, Proton, High Energy Physics::Phenomenology, Nuclear Theory, FOS: Physical sciences, Astronomy and Astrophysics, Observable, Atomic and Molecular Physics, and Optics, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment, Beam (structure)
Abstract

A brief experimental overview on the close-to-threshold eta meson production in proton-proton interactions is presented and the available observables in measurements with unpolarized and polarized beam and target are discussed., Comment: 4 pages; Presented at Meson 2004: 8th International Workshop on Meson Production, Properties and Interaction, Krakow, Poland, 4-8 June 2004; Submitted to International Journal of Modern Physics A

Published
2005

6. Recent results from PHOBOS at RHIC

Author

Andrzej Olszewski, Russell Richard Betts, Conor Henderson, L.J. Rosenberg, F. L. H. Wolfs, J. Sagerer, Bruce Becker, J.W. Lee, Baker, Jaw-Luen Tang, T. Gburek, Krzysztof Wozniak, D. McLeod, Barbara Wosiek, Burt Holzman, A. S. Carroll, R. Verdier, A. H. Wuosmaa, N. George, Marguerite Tonjes, C. E. Smith, P. Kulinich, W. Skulski, George Stephans, W. Kucewicz, J. L. Kane, B. Wysouch, C. Reed, S. Gushue, David Jonathan Hofman, S. Manly, C. Halliwell, M. Reuter, E. García, Jian Zhang, G. A. Heintzelman, P. Sarin, A. S. Harrington, C. Vale, Heinz Pernegger, K. Gulbrandsen, Christof Roland, Chia-Ming Kuo, P. Sawicki, Rachid Nouicer, Adam Trzupek, A. Sukhanov, L. P. Remsberg, J. Katzy, I. Sedykh, M. Ballintijn, Alice Mignerey, R. Hoynski, A. Iordanova, G. Van Nieuwenhuizen, Wit Busza, R. S. Hollis, J. Hamblen, R. Bindel, B. B. Back, Willis Lin, M. P. Decowski, A. Budzanowski, Inkyu Park, N. Khan, R. Pak, D. S. Barton, A. A. Bickley, Gunther Roland, Gabor Istvan Veres, Peter Steinberg, and E. Johnson

Subjects
Physics, Particle physics, Hadron, General Physics and Astronomy, Spectral line, Nuclear physics, Pseudorapidity, Transverse momentum, High Energy Physics::Experiment, Multiplicity (chemistry), Nuclear Experiment, Relativistic Heavy Ion Collider, Scaling, Multiplicity distribution
Abstract

PHOBOS is one of the four heavy ion experiments currently running at the Relativistic Heavy Ion Collider (RHIC). In this paper we will present some of the current results from PHOBOS: the study of charged multiplicity distribution as function of pseudorapidity and centrality at = 19.6, 130 and 200 GeV, a discussion of multiplicity scaling, and a measurement of transverse momentum spectra (pT) of charged hadrons produced in d+Au and Au+Au interactions at = 200 GeV. The dependence of the Au+Au yields as function of centrality is found to be independent of pT. A strong suppression in the Au+Au hadron spectra relative to p at high pT is observed. The spectral shape for d+Au collisions is significantly different from the observations in Au+Au, the yield suppression is not observed in d+Au.

Published
2004

7. Results from the PHOBOS experiment at RHIC

Author

D. McLeod, K. Gulbrandsen, A. S. Carroll, R. Verdier, J. Katzy, A. Sukhanov, M. P. Decowski, P. Kulinich, W. Kucewicz, Wit Busza, C. Halliwell, F. L. H. Wolfs, Rachid Nouicer, Adam Trzupek, W. T. Lin, Andrzej Olszewski, R. Pak, Baker, Chia-Ming Kuo, P. Sawicki, Inkyu Park, David Jonathan Hofman, J.W. Lee, N. George, Barbara Wosiek, W. Skulski, Burt Holzman, Gunther Roland, J. Sagerer, R. S. Hollis, A. Budzanowski, P. Sarin, I. Sedykh, Christof Roland, Russell Richard Betts, Conor Henderson, A. H. Wuosmaa, C. Vale, Heinz Pernegger, M. Reuter, Jian Zhang, N. Khan, Marguerite Tonjes, E. Garcia, G. Van Nieuwenhuizen, M. Ballintijn, K. Wozniak, C. Reed, L. P. Remsberg, Alice Mignerey, J. Hamblen, R. Bindel, R. Holynski, A. S. Harrington, A. Iordanova, D. S. Barton, A. A. Bickley, C. E. Smith, Bolek Wyslouch, L.J. Rosenberg, T. Gburek, S. Gushue, G. A. Heintzelman, J. L. Kane, S. Manly, B. B. Back, J.L. Teng, Gabor Istvan Veres, Peter Steinberg, E. Johnson, G.S.F. Stephans, and Bruce Becker

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Spectrometer, Physics::Instrumentation and Detectors, Elliptic flow, Particle accelerator, Particle detector, law.invention, Semiconductor detector, Nuclear physics, law, High Energy Physics::Experiment, Atomic physics, Multiplicity (chemistry), Nuclear Experiment, Relativistic Heavy Ion Collider
Abstract

PHOBOS is one of the four experiments at the Relativistic Heavy Ion Collider measuring p + p, d + Au , and Au + Au collisions over a broad range of energies. PHOBOS is a silicon-pad based detector with a 4π multiplicity detector and a high resolution mid-rapidity spectrometer, along with other detectors (time-of-flight walls, proton and zero degree calorimeters). PHOBOS is able to measure particles at low transverse momentum, spectra, flow, particle ratios, and multiplicity over a large region of phase space. A comparison of results for Au + Au and d + Au collisions at √S NN = 220GeV will be discussed.

Published
2004

8. PHOBOS at RHIC: Some global observations

Author

Alice Mignerey, G. Van Nieuwenhuizen, A. Budzanowski, S. Gushue, F. L. H. Wolfs, R. Teng, R. Bindel, P. Sawicki, W. T. Lin, J. Michałowski, C. Halliwell, E. García, L. P. Remsberg, Andrzej Olszewski, G. A. Heintzelman, P. Sarin, B.F. Wadsworth, S. G. Steadman, K. Woźniak, P. Kulinich, A. H. Wuosmaa, M. P. Decowski, W. Skulski, Gunther Roland, Burt Holzman, A. S. Carroll, R. Verdier, D. McLeod, Christof Roland, Bolek Wyslouch, P. Steinberg, M. Reuter, R. S. Hollis, M. D. Baker, L.J. Rosenberg, C. Reed, A. Iordanova, B. B. Back, R. Pak, R. Holynski, Chia-Ming Kuo, Barbara Wosiek, M. Stodulski, J. L. Kane, David Jonathan Hofman, S. Manly, J. Sagerer, C. Vale, Heinz Pernegger, M. Ballintijn, Jaw-Luen Tang, K. Gulbrandsen, J. Hamblen, J. Katzy, E. Johnson, Russell Richard Betts, Conor Henderson, Rachid Nouicer, Adam Trzupek, Inkyu Park, N. George, W. Kucewicz, A. Sukhanov, Wit Busza, N. Khan, George Stephans, D. S. Barton, and A. A. Bickley

Subjects
Physics, Nuclear physics, Particle physics, General Physics and Astronomy, High Energy Physics::Experiment, Heavy ion, Multiplicity (chemistry), Nuclear Experiment, Scaling
Abstract

Particle production in Au+Au collisions has been measured in the PHOBOS experiment at RHIC for a range of collision energies for a large span of pseudorapidities, |η| 65. This scaling occurs both for the total multiplicity and for highp T particles (3

Published
2003

9. Eta physics at threshold

Author

A. Strzałkowski, T. Sefzick, P. Kowina, T. Rozek, A. Budzanowski, S. Steltenkamp, W. Oelert, D. Grzonka, A. Khoukaz, P. Winter, L. Jarczyk, Jerzy Smyrski, B. Kamys, Michał Janusz, Paweł Moskal, T. Lister, R. Santo, K. Kilian, P. Wuestner, Magnus Wolke, M. Siemaszko, G. Schepers, H.-H. Adam, W. Zipper, and Rafał Czyżykiewicz

Subjects
Nuclear and High Energy Physics, Particle physics, Meson production, Meson, Nuclear Theory, proton beam, FOS: Physical sciences, hadroproduction [eta(958)], phase space, small momentum, interpretation of experiments [numerical calculations], production [model], exchange [meson], threshold, ddc:530, Nuclear Experiment (nucl-ex), Juelich 2002/06/09 [talk], Nuclear Experiment, hadroproduction [eta], Physics, N(1535), Observable, energy dependence [channel cross section], final-state interaction, Distribution (mathematics), meson production, Phase space, Isobar, inelastic scattering [p p], High Energy Physics::Experiment, inelastic scattering [p n], space volume, Nucleon, Excitation
Abstract

The production of eta and eta-prime mesons in elementary nucleon-nucleon collisions has been investigated at the synchrotrons CELSIUS, COSY and SATURNE. The magnitude and energy dependence of the total cross section as well as the occupation distribution of the phase space serve as observables for investigating the mechanisms underlying the production processes and the interaction of mesons with nucleons. The precise data on the eta and eta-prime creation via the pp --> pp eta(eta-prime) reactions allowed to settle the general features of the eta and eta-prime meson production and revealed the sensitivity of the mentioned observables to the nucleon-nucleon-meson final state interaction. The particular production properties, like for example the determination of the dominating exchange processes which lead to the excitation of the S_11 nucleon isobar in the case of eta creation, must be established by confrontation with other observables. The present status of this investigation with an emphasis on the results of the COSY-11 collaboration is briefly presented. The available data are interpreted in view of the production mechanism and the meson-nucleon interaction., 3 pages, 3 figures, Presented at Conference on Quarks and Nuclear Physics (QNP 2002), Julich, Germany, 9-14 Jun 2002

Published
2003

10. Identified particles in Au+Au collisions at GeV

Author

Barbara Wosiek, B.B. Back, M.D. Baker, D.S. Barton, R.R. Betts, M. Ballintijn, A.A. Bickley, R. Bindel, A. Budzanowski, W. Busza, A. Carroll, M.P. Decowski, E. García, N. George, K. Gulbrandsen, S. Gushue, C. Halliwell, J. Hamblen, G.A. Heintzelman, C. Henderson, D.J. Hofman, R.S. Hollis, R. Hołyński, B. Holzman, A. Iordanova, E. Johnson, J.L. Kane, J. Katzy, N. Khan, W. Kucewicz, P. Kulinich, C.M. Kuo, S. Manly, D. McLeod, J. Michałowski, A.C. Mignerey, R. Nouicer, A. Olszewski, R. Pak, I.C. Park, H. Pernegger, C. Reed, L.P. Remsberg, M. Reuter, C. Roland, G. Roland, L. Rosenberg, J. Sagerer, P. Sarin, P. Sawicki, W. Skulski, S.G. Steadman, P. Steinberg, G.S.F. Stephans, M. Stodulski, A. Sukhanov, J.-L. Tang, R. Teng, A. Trzupek, C. Vale, G.J. van Nieuwenhuizen, R. Verdier, B. Wadsworth, F.L.H. Wolfs, B. Wosiek, K. Woźniak, A.H. Wuosmaa, and B. Wysłouch

Subjects
Physics, Nuclear and High Energy Physics, Antiparticle, Spectrometer, 010308 nuclear & particles physics, Nuclear Theory, Invariant (physics), 7. Clean energy, 01 natural sciences, Nuclear physics, Transverse plane, Pion, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics
Abstract

The yields of identified particles have been measured at RHIC for Au+Au collisions at sqrt{s_NN} = 200 GeV using the PHOBOS spectrometer. The ratios of antiparticle to particle yields near mid-rapidity are presented. The first measurements of the invariant yields of charged pions, kaons and protons at very low transverse momenta are also shown.

Published
2003

11. Charged hadron transverse momentum distributions in Au+Au collisions at GeV

Author

B.B. Back, M.D. Baker, D.S. Barton, R.R. Betts, M. Ballintijn, A.A. Bickley, R. Bindel, A. Budzanowski, W. Busza, A. Carroll, M.P. Decowski, E. García, N. George, K. Gulbrandsen, S. Gushue, C. Halliwell, J. Hamblen, G.A. Heintzelman, C. Henderson, D.J. Hofman, R.S. Hollis, R. Hołyński, B. Holzman, A. Iordanova, E. Johnson, J.L. Kane, J. Katzy, N. Khan, W. Kucewicz, P. Kulinich, C.M. Kuo, W.T. Lin, S. Manly, D. McLeod, J. Michałowski, A.C. Mignerey, R. Nouicer, A. Olszewski, R. Pak, I.C. Park, H. Pernegger, C. Reed, L.P. Remsberg, M. Reuter, C. Roland, G. Roland, L. Rosenberg, J. Sagerer, P. Sarin, P. Sawicki, W. Skulski, S.G. Steadman, P. Steinberg, G.S.F. Stephans, M. Stodulski, A. Sukhanov, J.-L. Tang, R. Teng, A. Trzupek, C. Vale, G.J. van Nieuwenhuizen, R. Verdier, B. Wadsworth, F.L.H. Wolfs, B. Wosiek, K. Woźniak, A.H. Wuosmaa, and B. Wysłouch

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), 010308 nuclear & particles physics, Nuclear Theory, Hadron, Binary number, 01 natural sciences, Spectral line, Transverse plane, 0103 physical sciences, Transverse momentum, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon, Scaling
Abstract

We present transverse momentum distributions of charged hadrons produced in Au+Au collisions at sqrt(s_NN) = 200 GeV. The evolution of the spectra for transverse momenta p_T from 0.25 to 5GeV/c is studied as a function of collision centrality over a range from 65 to 344 participating nucleons. We find a significant change of the spectral shape between proton-antiproton and peripheral Au+Au collisions. Comparing peripheral to central Au+Au collisions, we find that the yields at the highest p_T exhibit approximate scaling with the number of participating nucleons, rather than scaling with the number of binary collisions.

Published
2003

12. Results from the PHOBOS Experiment at RHIC

Author

Alice Mignerey, R. Bindel, Andrzej Olszewski, N. George, W. Skulski, Burt Holzman, M. P. Decowski, P. Sarin, Inkyu Park, P. Kulinich, W. Kucewicz, Rachid Nouicer, Adam Trzupek, Christof Roland, J. Michałowski, C. Halliwell, C. Reed, David Jonathan Hofman, R. Pak, D. McLeod, B.F. Wadsworth, Marek Stodulski, D. S. Barton, S. G. Steadman, Krzysztof Woźniak, N. Khan, A. H. Wuosmaa, George Stephans, C. Vale, Heinz Pernegger, M. Reuter, F. L. H. Wolfs, Gunther Roland, R. Teng, A. Budzanowski, Peter Steinberg, M. D. Baker, A. Sukhanov, W. T. Lin, B. B. Back, Johannes Mülmenstädt, Wit Busza, E. Garcia, E. Johnson, K. Gulbrandsen, Jaw-Luen Tang, G. Van Nieuwenhuizen, J. Katzy, A. S. Carroll, R. Verdier, R. Holynski, J. L. Kane, S. Manly, P. Sawicki, Russell Richard Betts, Conor Henderson, Bolek Wyslouch, L.J. Rosenberg, Barbara Wosiek, S. Gushue, G. A. Heintzelman, and L. P. Remsberg

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), Elliptic flow, Hadron, General Physics and Astronomy, Charged particle, Nuclear physics, Antiproton, High Energy Physics::Experiment, Nuclear Experiment, Energy (signal processing), Bar (unit)
Abstract

Au+Au collisions have been studied at center-of-mass energies of $$\sqrt {s_{NN} } = 56$$ and 130 GeV using the PHOBOS detector at RHIC. Charged particle multiplicites have been measured as a function of center-of-mass energy, centrality and pseudo-rapidity, η. A total of 4100±400 charged particles are observed in the pseudo-rapidity range −5.4 < η < 5.4 for the most central collisions. A strong elliptic flow signal is seen in peripheral collisions at η = 0. The measurement of an antiprotons to protons ratio of $$\bar p/p = 0.60 \pm 0.04(stat) \pm 0.06(syst)$$ indicates that a nearly baryon-free region is created at midrapidity.

Published
2002

13. Meson production in p+d reactions

Author

B. J. Roy, A. Magiera, J. Bojowald, P. von Rossen, Lubomir Pentchev, L. Freindl, A. Strzalkowski, K. Grewer, H.S. Plendl, J. Ernst, T. Kutsarova, H. Machner, Jerzy Smyrski, M G Betigeri, S. Kliczewski, D. Frekers, R. Tsenov, L. Jarczyk, RV Srikantiah, R. Siudak, J. Lieb, W. Garske, B. Razen, K. Zwoll, K. Kilian, J. Ilieva, D. Protic, H. Nann, A. Budzanowski, W. Klimala, D. Kolev, A. Chatterjee, and A. Hamacher

Subjects
Nuclear reaction, Scattering cross-section, Nuclear and High Energy Physics, Meson production, Meson, Physics::Instrumentation and Detectors, media_common.quotation_subject, Nuclear Theory, FOS: Physical sciences, Elementary particle, Resonance (particle physics), Asymmetry, Nuclear physics, Pion, Symmetry breaking, Nuclear Experiment (nucl-ex), Nuclear Experiment, Boson, media_common, Physics, Threshold energy, Baryon, Isospin, High Energy Physics::Experiment, Nucleon, Beam (structure)
Abstract

The production of neutral and charged pions as well as eta mesons is studied in the Delta and N* resonance region, respectively. Heavy A=3 recoils were measured with the GEM detector. The differential cross sections covering the full angular range are compared with model calculations., Comment: 4 pages, latex, 4 figures, talk presented at the XVIIth European Conference on Few-Body Problems in Physics, Evora, Portugal, September 2000; to be published in Nucl. Phys. A

Published
2001

14. Charged-Particle Multiplicity near Midrapidity in CentralAu+AuCollisions atsNN=56and130GeV

Author

Barbara Wosiek, H.W. Kraner, P. Haridas, L. P. Remsberg, P. Kulinich, B. D. Bates, R. Teng, M. Friedl, Alice Mignerey, S. Manly, J. Shea, Rachid Nouicer, Adam Trzupek, J. Sinacore, W. Czyz, C. Conner, Bolek Wyslouch, R. Bindel, W. T. Lin, A. Sanzgiri, P. Zychowski, L.J. Rosenberg, A. E. Chen, J. L. Kane, C. Law, M. Reuter, Jan Godlewski, Andrzej Olszewski, C. Gomes, A. Sukhanov, P. Sarin, M. D. Baker, J. Kotuła, K. Gulbrandsen, K. Zalewski, Russell Richard Betts, Conor Henderson, J. Fitch, F. L. H. Wolfs, Wit Busza, R. Pak, Christof Roland, J. Katzy, A. Straczek, J. Scaduto, P. Sawicki, S. Gushue, M. Neal, C. Vale, Heinz Pernegger, B. B. Back, J. Halik, G. Van Nieuwenhuizen, Bogdan Dabrowski, A. B. Hayes, R. S. Hollis, R. Holynski, M. Plesko, G. A. Heintzelman, M. P. Decowski, K. Gałuszka, W. Kucewicz, D. McLeod, W. Kita, E. Griesmayer, A. H. Wuosmaa, A. Białas, J. Ligocki, George Stephans, C. Reed, Krzysztof Woźniak, R. Ganz, W. Bogucki, M. Strȩk, R. Baum, A. Budzanowski, D. Ross, S. G. Steadman, Inkyu Park, T. Coghen, Yuan-Hann Chang, S. Basilev, Gunther Roland, Marek Stodulski, Peter Steinberg, P. Fita, E. Johnson, J. Michałowski, C. Halliwell, B.F. Wadsworth, Z. Stopa, A. S. Carroll, R. Verdier, M. Patel, D. S. Barton, Johannes Mülmenstädt, K. Surowiecka, Jaw-Luen Tang, E. Garcia, M. Despet, John P. Ryan, M. Ceglia, N. George, M. Lemler, W. Skulski, and Burt Holzman

Subjects
Physics, Particle physics, 010308 nuclear & particles physics, General Physics and Astronomy, 01 natural sciences, Central region, Charged particle, Nuclear physics, Pseudorapidity, 0103 physical sciences, High Energy Physics::Experiment, Rapidity, Multiplicity (chemistry), Nuclear Experiment, 010306 general physics
Abstract

We present the first measurement of pseudorapidity densities of primary charged particles near midrapidity in Au+Au collisions at sqrt[s(NN)] = 56 and 130 GeV. For the most central collisions, we find the charged-particle pseudorapidity density to be dN/deta|(|eta

Published
2000

15. The PHOBOS experiment at the RHIC collider

Author

Judith M. Katzy, B. Back, M.D. Baker, D. Barton, R. Betts, A. Białas, A. Budzanowski, W. Busza, A. Carroll, Y.-H. Chang, A.E. Chen, T. Coghen, W. Czyż, M.P. Decowski, M. Friedl, K. Gałuszka, R. Ganz, E. Garcia-Solis, N. George, J. Godlewski, K.H. Gulbrandsen, S. Gushue, C. Halliwell, A. Hayes, G. Heintzelman, R. Hołyński, B. Holzman, U. Jagadish, E. Johnson, J. Kotuła, W. Kucewicz, P. Kulinich, M. Lemler, W.T. Lin, S. Manly, D. McLeod, J. Michałowski, A. Mignerey, J. Mülmenstädt, M. Neal, R. Nouicer, A. Olszewski, R. Pak, I. Park, H. Pernegger, M. Plesko, L.P. Remsberg, M. Reuter, G. Roland, L. Rosenberg, P. Sarin, P. Sawicki, P.J. Stanskas, G.S.F. Stephans, M. Stodulski, A. Sukhanov, A. Trzupek, G. Van Nieuwenhuizen, C. Vale, R. Verdier, B. Wadsworth, F. Wolfs, B. Wosiek, K. Woźniak, A. Wuosmaa, B. Wysłouch, and K. Zalewski

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Physics::Instrumentation and Detectors, Hadron, Observable, Particle identification, Particle detector, law.invention, Semiconductor detector, Nuclear physics, law, Quark–gluon plasma, High Energy Physics::Experiment, Nuclear Experiment, Collider, Relativistic Heavy Ion Collider
Abstract

PHOBOS is a compact silicon detector designed to study the physics of Au - Au collisions at a center-of-mass energy of 200 A GeV at the Relativistic Heavy Ion Collider. The main goal of the PHOBOS experiment is a comprehensive study of various hadronic observables that should reveal the onset of new phenomena expected to occur in central collisions of gold nuclei. In this paper the detector and the physics program of the PHOBOS experiment is presented.

Published
1999

16. A solid-state spectrometer for cooled beams with high acceptance and resolution in space and energy

Author

A. Hamacher, S. Kliczewski, H. Plendl, M. Drochner, S. Igel, K. Kilian, W. Garske, K. Grewer, B. Razen, R.V. Srikantiah, A. Budzanowski, K. Zwoll, D. Frekers, G. Kemmerling, Hartmut Machner, and D. Protic

Subjects
Physics, Nuclear and High Energy Physics, Proton, Spectrometer, Physics::Instrumentation and Detectors, Detector, Resolution (electron density), chemistry.chemical_element, Germanium, Semiconductor detector, Nuclear physics, Stack (abstract data type), chemistry, High Energy Physics::Experiment, Nuclear Experiment, Beam (structure)
Abstract

The GEM detector, a hybrid system consisting of the Germanium Wall and the magnetic spectrometer BIG KARL, was developed to investigate meson production and meson-nucleus interaction with cooled external proton beams from the COSY accelerator at Julich. The Germanium Wall is a stack of up to four annular position-sensitive semiconductor detectors made from high-purity germanium. Its special structure allows experiments with high counting rates. Design features and results from first test runs with the uncooled COSY beam are presented.

Published
1997

17. Jet production in proton-antiproton collisions and the meson cloud in the nucleon

Author

A. Szczurek and A. Budzanowski

Subjects
Quantum chromodynamics, Quark, Physics, Nuclear and High Energy Physics, Particle physics, Meson, media_common.quotation_subject, Nuclear Theory, High Energy Physics::Phenomenology, Asymmetry, Nuclear physics, Pion, Antiproton, High Energy Physics::Experiment, Nuclear Experiment, Nucleon, Lepton, media_common
Abstract

We discuss some selected effects which may potentially be responsible for an enhancement of the large- E τ inclusive jet production with respect to the modern NLO analyses observed recently by the CDF Collaboration at Fermilab. We find that in addition to the modification of large- x gluon distribution also target mass corrections in lepton DIS and effect of the pion cloud in the nucleon may be essential for a proper understanding of the experimental jet data. The meson cloud model which turned out to be successful in quantitative understanding of the Gottfried Sum Rule violation, SU(3) symmetry violation of the nucleon sea and the Drell-Yan asymmetry measured recently at CERN, produces also a sizable enhancement of the large- E τ inclusive jet cross section. This enhancement is caused by a substantial enhancement over standard parametrizations of the nucleon sea quark distributions at intermediate and large values of Bjorken- x parameter and/or a special structure of valence quark distributions due to the meson cloud.

Published
1997

18. Charged-particle multiplicity and pseudorapidity distributions measured with the PHOBOS detector inAu+Au,Cu+Cu,d+Au, andp+pcollisions at ultrarelativistic energies

Author

Pankaj Sarin, S. G. Steadman, Chia-Ming Kuo, I. Sedykh, A. Budzanowski, M. Ballintijn, J. Michałowski, Alice Mignerey, R. Bindel, Z. Chai, J. Hamblen, C. Halliwell, J. Kotuła, P. Steinberg, B.F. Wadsworth, W. Skulski, Burt Holzman, C. E. Smith, G. Van Nieuwenhuizen, E. García, V. Chetluru, R. Holynski, N. Khan, T. Gburek, P. Kulinich, Edward Allen Wenger, B.B. Back, D. McLeod, L.J. Rosenberg, S. S. Vaurynovich, R. Pak, Inkyu Park, P. Walters, Christof Roland, N. George, W. Kucewicz, A. H. Wuosmaa, R. S. Hollis, M. Reuter, M. D. Baker, Russell Richard Betts, Conor Henderson, P. Sawicki, A. S. Carroll, R. Verdier, A. Sukhanov, S. Gushue, Gunther Roland, M. Stodulski, Willis Lin, Wei Li, Wit Busza, David Jonathan Hofman, Rachid Nouicer, Adam Trzupek, G. A. Heintzelman, J. L. Kane, S. Manly, J. Sagerer, G. S. F. Stephans, K. Gulbrandsen, C. Vale, Heinz Pernegger, C. Loizides, D. S. Barton, Marguerite Tonjes, A. A. Bickley, Boleslaw Wyslouch, C. Reed, J. Katzy, F.L.H. Wolfs, L. P. Remsberg, M. P. Decowski, Barbara Wosiek, Gabor Istvan Veres, B. Alver, E. Johnson, K. Woźniak, A. Iordanova, and Andrzej Olszewski

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Hadron, Elementary particle, 7. Clean energy, 01 natural sciences, Charged particle, Nuclear physics, Baryon, Pseudorapidity, 0103 physical sciences, High Energy Physics::Experiment, Multiplicity (chemistry), Atomic physics, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider, Nucleon
Abstract

Pseudorapidity distributions of charged particles emitted in Au+Au, Cu+Cu, d+Au, and p+p collisions over a wide energy range have been measured using the PHOBOS detector at the BNL Relativistic Heavy-Ion Collider (RHIC). The centrality dependence of both the charged particle distributions and the multiplicity at midrapidity were measured. Pseudorapidity distributions of charged particles emitted with |{eta}

Published
2011

19. FIRST RESULTS FROM THE PHOBOS EXPERIMENT AT THE RHIC COLLIDER

Author

R. Pak, L J Rosenberg, M. Stodulski, D. S. Barton, R. Holynski, Rachid Nouicer, Adam Trzupek, R. Verdier, J. Michałowski, Bolek Wyslouch, Alice Mignerey, B.F. Wadsworth, A. Budzanowski, R. Bindel, S. Manly, R. Teng, K. Gulbrandsen, Jaw-Luen Tang, F. L.H. Wolfs, C. Reed, J. Katzy, W. T. Lin, David Jonathan Hofman, Barbara Wosiek, P. Kulinich, Russell Richard Betts, Conor Henderson, Andrzej Olszewski, Peter Steinberg, S. G. Steadman, W. Kucewicz, C. Vale, Heinz Pernegger, A. S. Carroll, E. Johnson, M. P. Decowski, C. Halliwell, I. C. Park, S. Gushue, K. Woźniak, A. H. Wuosmaa, G. Van Nieuwenhuizen, D. McLeod, M. Reuter, W. Skulski, M. D. Baker, Gunther Roland, J. Muelmenstaedt, E. Garcia, B. B. Back, P. Sawicki, N. George, George Stephans, Burt Holzman, J. L. Kane, P. Sarin, Wit Busza, A. Sukhanov, L. P. Remsberg, G. A. Heintzelman, and Christof Roland

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Astronomy and Astrophysics, Central region, Atomic and Molecular Physics, and Optics, Charged particle, law.invention, Nuclear physics, Primary (astronomy), law, Pseudorapidity, High Energy Physics::Experiment, Center of mass, Nuclear Experiment, Nucleon, Collider, Relativistic Heavy Ion Collider
Abstract

PHOBOS is one of the four experiments at the Relativistic Heavy Ion Collider that started colliding gold nuclei at a center of mass energy of √sNN = 56 and 130 GeV per pair of colliding nucleons in June 2000. The pseudorapidity density of primary charged particles in central collisions has been measured near mid-rapidity.

Published
2001

20. Experimental study of thep+6Li→η+7Bereaction 11.3 MeV above threshold

Author

P. Hawranek, D. Protic, A. Chatterjee, Di. Kirillov, D. Kolev, M. Kravcikova, R. Jahn, A. Budzanowski, K. Kilian, S. Kliczewski, G. Martinska, N.M. Piskunov, G. Vankova, J. Urban, B. J. Roy, P. von Rossen, Da. Kirillov, I.M. Sitnik, R. Maier, M. Lesiak, J. Lieb, Hartmut Machner, Vivekanand Jha, J. Ritman, R. Tsenov, A. Magiera, and R. Siudak

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Meson, Hadron, High Energy Physics::Experiment, Elementary particle, Atomic physics, Nuclear Experiment, Isotopes of beryllium, Ground state, Omega, Boson
Abstract

The cross section for the reaction p+{sup 6}Li{yields}{eta}+{sup 7}Be was measured at an excess energy of 11.28 MeV above threshold by detecting the recoiling {sup 7}Be nuclei. A dedicated set of focal plane detectors was built for the magnetic spectrograph Big Karl and was used for identification and four-momentum measurement of {sup 7}Be. A differential cross section of nb/(d{sigma}/d{Omega})=[0.69{+-}0.20(stat.){+-}0.20(syst.)] sr for the ground state plus 1/2{sup -} was measured. The result is compared to model calculations.

Published
2010

21. Study of the $\bm{p+^6}$Li$\bm{\to\eta+^7}$Be reaction 11.3 MeV above threshold

Author

Budzanowski, A., Chatterjee, A., Hawranek, P., Jahn, R., Jha, V., Kilian, K., Kliczewski, S., Kirillov, Da., Kirillov, Di., Kolev, D., Kravcikova, M., Lesiak, M., Lieb, J., Machner, H., Magiera, A., Maier, R., Martinska, G., Piskunov, N., Protić, D., Ritman, J., von Rossen, P., Roy, B. J., Sitnik, I., Siudak, R., Tsenov, R., Urban, J., and Vankova, G.

Subjects
Nuclear Theory, High Energy Physics::Experiment, Nuclear Experiment
Abstract

The cross section for the reaction $p+^6\text{Li}\to\eta+^7\text{Be}$ was measured at an excess energy of 11.28 MeV above threshold by detecting the recoiling $^7$Be nuclei. A dedicated set of focal plane detectors was built for the magnetic spectrograph Big Karl and was used for identification and four momentum measurement of the $^7$Be. A differential cross section of $\frac{d\sigma}{d\Omega}=(0.69\pm{0.20}\text{(stat.)}\pm 0.20\text{(syst.)})\text{nb/sr}$ for the ground state plus the 1/2$^-$ was measured. The result is compared to model calculations., Comment: accepted by Phys. Rev. C as rapid communication

Published
2010

22. Study of the $\bm{p+^6}$Li$\bm{\to��+^7}$Be reaction 11.3 MeV above threshold

Author

Budzanowski, A., Chatterjee, A., Hawranek, P., Jahn, R., Jha, V., Kilian, K., Kliczewski, S., Kirillov, Da., Kirillov, Di., Kolev, D., Kravcikova, M., Lesiak, M., Lieb, J., Machner, H., Magiera, A., Maier, R., Martinska, G., Piskunov, N., Proti��, D., Ritman, J., von Rossen, P., Roy, B. J., Sitnik, I., Siudak, R., Tsenov, R., Urban, J., and Vankova, G.

Subjects
Nuclear Theory (nucl-th), FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

The cross section for the reaction $p+^6\text{Li}\to��+^7\text{Be}$ was measured at an excess energy of 11.28 MeV above threshold by detecting the recoiling $^7$Be nuclei. A dedicated set of focal plane detectors was built for the magnetic spectrograph Big Karl and was used for identification and four momentum measurement of the $^7$Be. A differential cross section of $\frac{d��}{d��}=(0.69\pm{0.20}\text{(stat.)}\pm 0.20\text{(syst.)})\text{nb/sr}$ for the ground state plus the 1/2$^-$ was measured. The result is compared to model calculations., accepted by Phys. Rev. C as rapid communication

Published
2010
Full Text
View/download PDF

23. Experimental study of the p + $^{6}$ Li → η + $^{7}$ Be reaction 11.3 MeV above threshold

Author

Budzanowski, A., Chatterjee, A., Kravcikova, M., Lesiak, M., Lieb, J., Machner, H., Magiera, A., Maier, R., Martinska, G., Piskunov, N., Protić, D., Ritman, J., Hawranek, P., von Rossen, P., Roy, B. J., Sitnik, I., Siudak, R., Tsenov, R., Urban, J., Vankova, G., Jahn, R., Jha, V., Kilian, K., Kliczewski, S., Kirillov, Da., Kirillov, Di., and Kolev, D.

Subjects
High Energy Physics::Experiment, ddc:530, Nuclear Experiment
Abstract

The cross section for the reaction p+6Li→η+7Be was measured at an excess energy of 11.28 MeV above threshold by detecting the recoiling Be7 nuclei. A dedicated set of focal plane detectors was built for the magnetic spectrograph Big Karl and was used for identification and four-momentum measurement of Be7. A differential cross section of dσdΩ=[0.69±0.20(stat.)±0.20(syst.)] nb/sr for the ground state plus 1/2− was measured. The result is compared to model calculations.

Published
2010

24. ISOSPIN DEPENDENCE OF THE eta ' MESON PRODUCTION IN NUCLEON-NUCLEON COLLISIONS

Author

A. Khoukaz, Damian Tomasz Gil, M. Siemaszko, D. Grzonka, Marcin Zieliński, W. Oelert, R. Czyzykiewicz, Eryk Czerwiński, W. Zipper, B. Rejdych, J. Przerwa, J. Ritman, L. Jarczyk, Jerzy Smyrski, B. Kamys, P. Wüstner, Tord Johansson, Wojciech Krzemien, M. Wolke, A. Budzanowski, Jarosław Zdebik, Cezary Piskor-Ignatowicz, Paweł Klaja, A. Täschner, Michał Silarski, Paweł Moskal, and T. Sefzick

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson production, Meson, Mathematics::Number Theory, High Energy Physics::Phenomenology, Nuclear Theory, Near-threshold meson production, quasi-free reaction, FOS: Physical sciences, Astronomy and Astrophysics, Atomic and Molecular Physics, and Optics, Nuclear physics, Isospin, High Energy Physics::Experiment, ddc:530, Nuclear Experiment (nucl-ex), Nucleon, Nuclear Experiment
Abstract

A comparison of the close-to-threshold total cross section for the eta prime production in pp --> pp eta prime and pn --> pn eta prime reactions constitutes a tool to investigate the eta prime meson structure and the reaction mechanism in the channels of isospin I=0 and I=1 and may provide insight into the flavour-singlet (perhaps also into gluonium) content of the eta prime meson. In this contribution we present preliminary results of measurement of the quasi-free production of the eta prime meson in the proton-neutron collisions conducted using the COSY-11 facility., Presented at 10th International Workshop on Meson Production, Properties and Interaction (MESON 2008), Cracow, Poland, 6 - 10 June 2008

Published
2009

25. Physics Performance Report for: PANDA. Strong Interaction Studies with Antiprotons

Author

PANDA Collaboration, W. Erni, I. Keshelashvili, B. Krusche, M. Steinacher, Y. Heng, Z. Liu, H. Liu, X. Shen, O. Wang, H. Xu, J. Becker, F. Feldbauer, F. -H. Heinsius, T. Held, H. Koch, B. Kopf, M. Pelizaeus, T. Schroeder, M. Steinke, U. Wiedner, J. Zhong, A. Bianconi, M. Bragadireanu, D. Pantea, A. Tudorache, V. Tudorache, M. De Napoli, F. Giacoppo, G. Raciti, E. Rapisarda, C. Sfienti, E. Bialkowski, A. Budzanowski, B. Czech, M. Kistryn, S. Kliczewski, A. Kozela, P. Kulessa, K. Pysz, W. Schaefer, R. Siudak, A. Szczurek, W. Czy. zycki, M. Domagala, M. Hawryluk, E. Lisowski, F. Lisowski, L. Wojnar, D. Gil, P. Hawranek, B. Kamys, St. Kistryn, K. Korcyl, W. Krzemien, A. Magiera, P. Moskal, Z. Rudy, P. Salabura, J. Smyrski, A. Wronska, M. Al-Turany, I. Augustin, H. Deppe, H. Flemming, J. Gerl, K. Goetzen, R. Hohler, D. Lehmann, B. Lewandowski, J. Luehning, F. Maas, D. Mishra, H. Orth, K. Peters, T. Saito, G. Schepers, C. J. Schmidt, L. Schmitt, C. Schwarz, B. Voss, P. Wieczorek, A. Wilms, K. -T. Brinkmann, H. Freiesleben, R. Jaekel, R. Kliemt, T. Wuerschig, H. -G. Zaunick, V. M. Abazov, G. Alexeev, A. Arefiev, V. I. Astakhov, M. Yu. Barabanov, B. V. Batyunya, Yu. I. Davydov, V. Kh. Dodokhov, A. A. Efremov, A. G. Fedunov, A. A. Feshchenko, A. S. Galoyan, S. Grigoryan, A. Karmokov, E. K. Koshurnikov, V. Ch. Kudaev, V. I. Lobanov, Yu. Yu. Lobanov, A. F. Makarov, L. V. Malinina, V. L. Malyshev, G. A. Mustafaev, A. Olshevski, M. A. . Pasyuk, E. A. Perevalova, A. A. Piskun, T. A. Pocheptsov, G. Pontecorvo, V. K. Rodionov, Yu. N. Rogov, R. A. Salmin, A. G. Samartsev, M. G. Sapozhnikov, A. Shabratova, G. S. Shabratova, A. N. Skachkova, N. B. Skachkov, E. A. Strokovsky, M. K. Suleimanov, R. Sh. Teshev, V. V. Tokmenin, V. V. Uzhinsky, A. S. Vodopianov, S. A. Zaporozhets, N. I. Zhuravlev, A. G. Zorin, D. Branford, K. Foehl, D. Glazier, D. Watts, P. Woods, W. Eyrich, A. Lehmann, A. Teufel, S. Dobbs, Z. Metreveli, K. Seth, B. Tann, A. Tomaradze, D. Bettoni, V. Carassiti, A. Cecchi, P. Dalpiaz, E. Fioravanti, I. Garzia, M. Negrini, M. Savri`e, G. Stancari, B. Dulach, P. Gianotti, C. Guaraldo, V. Lucherini, E. Pace, A. Bersani, M. Macri, M. Marinelli, R. F. Parodi, I. Brodski, W. Doering, P. Drexler, M. Dueren, Z. Gagyi-Palffy, A. Hayrapetyan, M. Kotulla, W. Kuehn, S. Lange, M. Liu, V. Metag, M. Nanova, R. Novotny, C. Salz, J. Schneider, P. Schoenmeier, R. Schubert, S. Spataro, H. Stenzel, C. Strackbein, M. Thiel, U. Thoering, S. Yang, T. Clarkson, E. Cowie, E. Downie, G. Hill, M. Hoek, D. Ireland, R. Kaiser, T. Keri, I. Lehmann, K. Livingston, S. Lumsden, D. MacGregor, B. McKinnon, M. Murray, D. Protopopescu, G. Rosner, B. Seitz, G. Yang, M. Babai, A. K. Biegun, A. Bubak, E. Guliyev, V. S. Jothi, M. Kavatsyuk, H. Loehner, J. Messchendorp, H. Smit, J. C. van der Weele, F. Garcia, D. -O. Riska, M. Buescher, R. Dosdall, R. Dzhygadlo, A. Gillitzer, D. Grunwald, V. Jha, G. Kemmerling, H. Kleines, A. Lehrach, R. Maier, M. Mertens, H. Ohm, D. Prasuhn, T. Randriamalala, J. Ritman, M. Roeder, T. Stockmanns, P. Wintz, P. Wuestner, J. Kisiel, S. Li, Z. Li, Z. Sun, S. Fissum, K. Hansen, L. Isaksson, M. Lundin, B. Schroeder, P. Achenbach, M. C. Mora Espi, J. Pochodzalla, S. Sanchez, A. Sanchez-Lorente, V. I. Dormenev, A. A. Fedorov, M. V. Korzhik, O. V. Missevitch, V. Balanutsa, V. Chernetsky, A. Demekhin, A. Dolgolenko, P. Fedorets, A. Gerasimov, V. Goryachev, A. Boukharov, O. Malyshev, I. Marishev, A. Semenov, C. Hoeppner, B. Ketzer, I. Konorov, A. Mann, S. Neubert, S. Paul, Q. Weitzel, A. Khoukaz, T. Rausmann, A. Taeschner, J. Wessels, R. Varma, E. Baldin, K. Kotov, S. Peleganchuk, Yu. Tikhonov, J. Boucher, T. Hennino, R. Kunne, S. Ong, J. Pouthas, B. Ramstein, P. Rosier, M. Sudol, J. Van de Wiele, T. Zerguerras, K. Dmowski, R. Korzeniewski, D. Przemyslaw, B. Slowinski, G. Boca, A. Braghieri, S. Costanza, A. Fontana, P. Genova, L. Lavezzi, P. Montagna, A. Rotondi, N. I. Belikov, A. M. Davidenko, A. A. Derevschikov, Y. M. Goncharenko, V. N. Grishin, V. A. Kachanov, D. A. Konstantinov, V. A. Kormilitsin, V. I. Kravtsov, Y. A. Matulenko, Y. M. Melnik, A. P. Meschanin, N. G. Minaev, V. V. Mochalov, D. A. Morozov, L. V. Nogach, S. B. Nurushev, A. V. Ryazantsev, P. A. Semenov, L. F. Soloviev, A. V. Uzunian, A. N. Vasiliev, A. E. Yakutin, T. Baeck, B. Cederwall, C. Bargholtz, L. Geren, P. E. Tegner, S. Belostotski, G. Gavrilov, A. Itzotov, A. Kisselev, P. Kravchenko, S. Manaenkov, O. Miklukho, Y. Naryshkin, D. Veretennikov, V. Vikhrov, A. Zhadanov, L. Fava, D. Panzieri, D. Alberto, A. Amoroso, E. Botta, T. Bressani, S. Bufalino, M. P. Bussa, L. Busso, F. De Mori, M. Destefanis, L. Ferrero, A. Grasso, M. Greco, T. Kugathasan, M. Maggiora, S. Marcello, G. Serbanut, S. Sosio, R. Bertini, D. Calvo, S. Coli, P. De Remigis, A. Feliciello, A. Filippi, G. Giraudo, G. Mazza, A. Rivetti, K. Szymanska, F. Tosello, R. Wheadon, O. Morra, M. Agnello, F. Iazzi, R. Birsa, F. Bradamante, A. Bressan, A. Martin, H. Clement, C. Ekstroem, H. Calen, S. Grape, B. Hoeistad, T. Johansson, A. Kupsc, P. Marciniewski, E. Thome, J. Zlomanczuk, J. Diaz, A. Ortiz, S. Borsuk, A. Chlopik, Z. Guzik, J. Kopec, T. Kozlowski, D. Melnychuk, M. Plominski, J. Szewinski, K. Traczyk, B. Zwieglinski, P. Buehler, A. Gruber, P. Kienle, J. Marton, E. Widmann, J. Zmeskal, M. F. M. Lutz, B. Pire, O. Scholten, and R. Timmermans

Subjects
Physics::Instrumentation and Detectors, Nuclear Theory, High Energy Physics::Experiment, Nuclear Experiment
Abstract

To study fundamental questions of hadron and nuclear physics in interactions of antiprotons with nucleons and nuclei, the universal PANDA detector will be built. Gluonic excitations, the physics of strange and charm quarks and nucleon structure studies will be performed with unprecedented accuracy thereby allowing high-precision tests of the strong interaction. The proposed PANDA detector is a state-of-the art internal target detector at the HESR at FAIR allowing the detection and identification of neutral and charged particles generated within the relevant angular and energy range. This report presents a summary of the physics accessible at PANDA and what performance can be expected.

Published
2009

26. Near threshold production of the pseudoscalar mesons at the COSY-11 facility

Author

A. Khoukaz, P. Wüstner, J. Przerwa, Damian Tomasz Gil, T. Sefzick, R. Czyzykiewicz, A. Täschner, Michał Silarski, L. Jarczyk, Paweł Moskal, P. Winter, M. Wolke, A. Budzanowski, Michał Janusz, D. Grzonka, J. Ritman, K. Kilian, B. Rejdych, Cezary Piskor-Ignatowicz, W. Oelert, W. Zipper, Eryk Czerwiński, M. Siemaszko, Jerzy Smyrski, B. Kamys, P. Klaja, H.-H. Adam, and Marcin Zieliński

Subjects
Physics, Particle physics, Proton, Meson, High Energy Physics::Phenomenology, Nuclear Theory, Hyperon, FOS: Physical sciences, Context (language use), Lambda, Pseudoscalar meson, Pseudoscalar, Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nucleon, Nuclear Experiment
Abstract

We summarise measurements of the COSY-11 collaboration concerning the excitation functions of the near threshold pseudoscalar meson production in the proton-proton interaction. The results are discussed in the context of the meson-nucleon and hyperon-nucleon interactions. We conclude that the $\eta$-proton interaction is significantly stronger than the eta'-proton interaction. Similarly, we found that the hyperon Lambda interacts with the nucleon considerably stronger than the hyperon Sigma, and that the interaction of (K-)-proton is much stronger than this of the (K+)-proton., Comment: 3 pages, 3 figures, Presented at the Workshop on the physics of excited nucleons (NSTAR 2007), 5-8 September 2007, Bonn, Germany

Published
2008

27. A large acceptance scintillator detector with wavelength shifting fibre read-out for search of eta-nucleus bound states

Author

J. Urban, B. J. Roy, Di. Kirillov, A. Magiera, S. Guha, M G Betigeri, M. Lesiak, M. Ulicny, P. Hawranek, Prashant Shukla, R. Siudak, T. Kutsarova, D. Prasuhn, G. Vankova, R. Jahn, M. Kravcikova, R. Maier, A. Budzanowski, S. Kliczewski, D. Kolev, Vivekanand Jha, J. Ritman, N.M. Piskunov, R. Tsenov, J. Lieb, K. Kilian, S. Nedev, G. Martinska, P.K. Biswas, P. von Rossen, B. K. Jain, Hartmut Machner, I.M. Sitnik, D. Protic, A. Chatterjee, Da. Kirillov, and S.B. Jawale

Subjects
scintillator detector, WLS optical fibre readout, Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Proton, Physics::Instrumentation and Detectors, Nuclear Theory, FOS: Physical sciences, Scintillator, Particle identification, law.invention, Nuclear physics, Pion, law, Hermetic detector, ddc:530, Nuclear Experiment (nucl-ex), Nuclear Experiment, Instrumentation, eta-nucleus bound states, Physics, Range (particle radiation), Detector, Instrumentation and Detectors (physics.ins-det), Synchrotron, High Energy Physics::Experiment
Abstract

A large acceptance scintillator detector with wavelength shifting optical fibre readout has been designed and built to detect the decay particles of $\eta$-nucleus bound system (the so-called $\eta$-mesic nuclei), namely, protons and pions. The detector, named as ENSTAR detector, consists of 122 pieces of plastic scintillator of various shapes and sizes, which are arranged in a cylindrical geometry to provide particle identification, energy loss and coarse position information for these particles. A solid angle coverage of $\sim$95% of total 4$\pi$ is obtained in the present design of the detector. Monte Carlo phase space calculations performed to simulate the formation and decay of $\eta$-mesic nuclei suggest that its decay particles, the protons and pions are emitted with an opening angle of 150$^\circ \pm 20^\circ$, and with energies in the range of 25 to 300 MeV and 225 to 450 MeV respectively. The detailed GEANT simulations show that $\sim$ 80 % of the decay particles (protons and pions) can be detected within ENSTAR. Several test measurements using alpha source, cosmic-ray muons etc. have been carried out to study the response of ENSTAR scintillator pieces. The in-beam tests of fully assembled detector with proton beam of momentum 870 MeV/c from the Cooler synchrotron COSY have been performed. The test results show that the scintillator fiber design chosen for the detector has performed satisfactorily well. The present article describes the detector design, simulation studies, construction details and test results., Comment: accepted by Nucl. Instr. Methods in Phys. Research A

Published
2007

28. HadronicHe3ηproduction near threshold

Author

B. Kamys, W. Zipper, P. Wüstner, Rafał Czyżykiewicz, D. Grzonka, Michał Janusz, R. Santo, J. Przerwa, Magnus Wolke, M. Siemaszko, T. Lister, A. Budzanowski, I. Geck, Paweł Klaja, Paweł Moskal, A. Khoukaz, A. Täschner, H.-H. Adam, T. Rozek, S. Steltenkamp, L. Jarczyk, Cezary Piskor-Ignatowicz, Jerzy Smyrski, K. Kilian, W. Oelert, T. Sefzick, P. Winter, and Eryk Czerwiński

Subjects
Physics, Nuclear and High Energy Physics, Isotropy, Hadron, Scattering length, Nuclear physics, Distribution (mathematics), Deuterium, Helium-3, High Energy Physics::Experiment, Production (computer science), Atomic physics, Nuclear Experiment, Anisotropy
Abstract

Measurements of {eta} meson production in proton-deuteron collisions have been performed using the COSY-11 facility at COSY (Juelich). Results on total and differential cross sections for the pd{yields}{sup 3}He{eta} reaction are presented at five excess energies between Q=5.0 and Q=40.6 MeV. The angular distributions show a transition from an almost isotropic emission close to threshold to a highly anisotropic distribution at higher excess energies. The total cross sections reveal a strong {eta}-{sup 3}He final state interaction, corresponding to a scattering length of vertical bar real(a) vertical bar=(4.2{+-}0.5) fm and (a)=(0.4{+-}1.9) fm.

Published
2007

29. Mechanism of near-threshold production of the $\eta$ meson

Author

M. Siemaszko, P. Winter, J. Ritman, A. Khoukaz, D. Grzonka, B. Rejdych, W. Oelert, W. Zipper, K. Ulbrich, K. Kilian, Paweł Moskal, L. Jarczyk, Rafał Czyżykiewicz, T. Sefzick, H.-H. Adam, B. Lorentz, A. Täschner, Eryk Czerwiński, Michał Janusz, J. Przerwa, Damian Tomasz Gil, Cezary Piskor-Ignatowicz, A. Budzanowski, Paweł Klaja, B. Kamys, P. Wüstner, Magnus Wolke, Jerzy Smyrski, and M. Hodana

Subjects
Particle physics, Nuclear Theory, General Physics and Astronomy, Juelich COSY PS, +2p+eta%22">p p --> 2p eta, Resonance (particle physics), Nuclear physics, polarized beam [p], Cross section (physics), Pion, production [model], S-wave, ddc:550, threshold, Nuclear Experiment, hadroproduction [eta], effect [N(1535)], Physics, Eta meson, exchange [pi], angular dependence, Isospin, inelastic scattering [p p], analyzing power, High Energy Physics::Experiment, Nucleon, Excitation, experimental results
Abstract

Measurements of the analyzing power for the pp -> pp eta reaction have been performed at excess energies of Q=10 and 36 MeV. The determined analyzing power is essentially consistent with zero, implying dominance of the s wave at both excess energies. The angular dependence of the analyzing power, combined with the isospin dependence of the total cross section for the eta meson production in nucleon-nucleon collisions, reveal that the excitation of the nucleon to the S-11(1535) resonance is predominantly due to the exchange of the pi meson between the colliding nucleons.

Published
2007

30. Forward-backward multiplicity correlations insNN=200GeV Au+Au collisions

Author

Marguerite Tonjes, Inkyu Park, Russell Richard Betts, Conor Henderson, M. A. Stankiewicz, C. Reed, A. H. Wuosmaa, R. Noucier, N. George, Barbara Wosiek, F. L. H. Wolfs, David Jonathan Hofman, Christof Roland, I. Sedykh, R. Pak, C. E. Smith, B. B. Back, J. Sagerer, Alice Mignerey, K. Gulbrandsen, Jaw-Luen Tang, R. Bindel, Bolek Wyslouch, S. S. Vaurynovich, G. Van Nieuwenhuizen, L.J. Rosenberg, P. Sarin, C. Vale, Heinz Pernegger, N. Khan, M. P. Decowski, Edward Allen Wenger, A. S. Carroll, M. Reuter, Adam Trzupek, R. Verdier, S. Gushue, L. P. Remsberg, P. Kulinich, G. A. Heintzelman, R. S. Hollis, M. D. Baker, C. Halliwell, W. Skulski, J. L. Kane, W. T. Lin, A. Iordanova, S. Manly, Burt Holzman, A. Budzanowski, J. Katzy, Gunther Roland, P. Sawicki, K. Woźniak, Chia-Ming Kuo, T. Gburek, M. Ballintijn, D. McLeod, Gabor Istvan Veres, Peter Steinberg, J. Hamblen, E. Johnson, E. García, Andrzej Olszewski, R. Holynski, D. S. Barton, A. A. Bickley, W. Kucewicz, Z. Chai, A. Sukhanov, M. Hauer, Wit Busza, George Stephans, and H. Seals

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, media_common.quotation_subject, Detector, Forward backward, Multiplicity (mathematics), 01 natural sciences, Asymmetry, Nuclear physics, Angular correlation, Pseudorapidity, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, media_common
Abstract

Forward-backward correlations of charged-particle multiplicities in symmetric bins in pseudorapidity (eta) are studied in order to gain insight into the underlying correlation structure of particle production in Au+Au collisions. The PHOBOS detector is used to measure integrated multiplicities in bins defined within eta

Published
2006

31. Energy Dependence of Directed Flow over a Wide Range of Pseudorapidity inAu+AuCollisions at the BNL Relativistic Heavy Ion Collider

Author

Marguerite Tonjes, F. L. H. Wolfs, C. Reed, M. P. Decowski, W. T. Lin, David Jonathan Hofman, Edward Allen Wenger, Alice Mignerey, Christof Roland, Andrzej Olszewski, R. Bindel, Chia-Ming Kuo, B. B. Back, K. Gulbrandsen, T. Gburek, Russell Richard Betts, Conor Henderson, C. Vale, Heinz Pernegger, S. S. Vaurynovich, J. Sagerer, N. Khan, J. Katzy, Jaw-Luen Tang, A. Iordanova, M. Ballintijn, Z. Chai, I. Sedykh, S. Gushue, P. Kulinich, J. L. Kane, S. Manly, R. Holynski, D. McLeod, J. Hamblen, P. Sarin, R. S. Hollis, A. Budzanowski, D. S. Barton, Gabor Istvan Veres, A. A. Bickley, Peter Steinberg, N. George, W. Skulski, Rachid Nouicer, Burt Holzman, Adam Trzupek, G. A. Heintzelman, E. García, P. Sawicki, G. Van Nieuwenhuizen, W. Kucewicz, George Stephans, A. H. Wuosmaa, Inkyu Park, E. Johnson, H. Seals, Bolek Wyslouch, A. Sukhanov, L.J. Rosenberg, M. Hauer, Gunther Roland, Wit Busza, R. Pak, Krzysztof Wozniak, Barbara Wosiek, M. Reuter, M. D. Baker, M. A. Stankiewicz, C. E. Smith, L. P. Remsberg, A. S. Carroll, R. Verdier, and C. Halliwell

Subjects
Physics, Range (particle radiation), Particle physics, 010308 nuclear & particles physics, Elliptic flow, Detector, General Physics and Astronomy, 01 natural sciences, Charged particle, Nuclear physics, Flow (mathematics), Pseudorapidity, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider, Scaling
Abstract

We report on measurements of directed flow as a function of pseudorapidity in Au + Au collisions at energies of square root of SNN = 19.6, 62.4, 130 and 200 GeV as measured by the PHOBOS detector at the BNL Relativistic Heavy Ion Collider. These results are particularly valuable because of the extensive, continuous pseudorapidity coverage of the PHOBOS detector. There is no significant indication of structure near midrapidity and the data surprisingly exhibit extended longitudinal scaling similar to that seen for elliptic flow and charged particle pseudorapidity density.

Published
2006

32. Study of the 3He-eta system in d-p collisions at COSY-11

Author

Smyrski, J., Adam, H. -H., Budzanowski, A., Czerwinski, E., Czyzykiewicz, R., Gil, D., Grzonka, D., Heczko, A., Janusz, M., Jarczyk, L., Kamys, B., Khoukaz, A., Kilian, K., Klaja, P., Majewski, J., Moskal, P., Oelert, W., Piskor-Ignatowicz, C., Przerwa, J., Ritman, J., Rozek, T., Santo, R., Sefzick, T., Siemaszko, M., Taeschner, A., Winter, P., Wolke, M., Wuestner, P., Zhang, Z., and Zipper, W.

Subjects
FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

We present preliminary results from dp --> 3He X (X=pi0,eta) measurements near the eta production threshold. The data were taken during a slow ramping of the COSY internal deuteron beam scattered on a proton target. The 3He ejectiles were registered with the COSY-11 detection setup. The ongoing data analysis should deliver high precision data for the dp --> 3He eta total and differential cross sections for the excess energies in the range from threshold up to 9 MeV. The preliminary excitation function for the reaction dp --> 3He pi0 does not show any structure which could originate from the decay of 3He-eta bound state. We present also a threshold excitation curve for the dp --> 3He X channel. Contrary to corresponding results from SATURNE we see no cusp in the vicinity of the eta threshold., 8 pages; 5 figures; Talk at Eta05 Workshop on Production and Decay of eta and eta-prime Mesons, Cracow, Poland, 15-18 Sep 2005; Acta Phys. Slovaca, in print

Published
2006

33. Eta and eta' mesons production at COSY-11

Author

A. Khoukaz, T. Rozek, T. Sefzick, Paweł Klaja, L. Jarczyk, D. Grzonka, Damian Tomasz Gil, A. Taeschner, M. Siemaszko, Paweł Moskal, Magnus Wolke, Michał Janusz, W. Oelert, J. Przerwa, W. Zipper, Cezary Piskor-Ignatowicz, B. Rejdych, J. Majewski, P. Winter, A. Budzanowski, Rafał Czyżykiewicz, H.-H. Adam, P. Wuestner, Eryk Czerwiński, B. Kamys, J. Ritman, and Jerzy Smyrski

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, Proton, Hadron, Eta meson, Nuclear Theory, FOS: Physical sciences, Astronomy and Astrophysics, Atomic and Molecular Physics, and Optics, meson-nucleon interaction, High Energy Physics - Experiment, near threshold meson production, High Energy Physics - Experiment (hep-ex), Pion, Isospin, High Energy Physics::Experiment, Nucleon, Nuclear Experiment, Relative angular momentum
Abstract

The low emittance and small momentum spread of the proton and deuteron beams of the Cooler Synchrotron COSY combined with the high mass resolution of the COSY-11 detection system permit to study the creation of mesons in the nucleon-nucleon interaction down to the fraction of MeV with respect to the kinematical threshold. At such small excess energies, the ejectiles possess low relative momenta and are predominantly produced with the relative angular momentum equal to zero. Taking advantage of these conditions we have performed investigations aiming to determine the mechanism of the production of eta and eta' mesons in the collision of hadrons as well as the hadronic interaction of these mesons with nucleons and nuclei. In this proceedings we address the ongoing studies of the spin and isospin dependence for the production of the eta and eta' mesons in free and quasi-free nucleon-nucleon collisions. New results on the spin observables for the vec(p)p --> pp eta reaction, combined with the previously determined total cross section isospin dependence, reveal a statistically significant indication that the excitation of the nucleon to the S11(1535) resonance, the process which intermediates the production of the eta meson in the nucleon-nucleon interactions, is predominantly due to the exchange of the pi meson between the colliding nucleons., Invited talk at MESON 2006: 9th International Workshop on Meson Production, Properties and Interactions, Cracow, Poland, 9-13 Jun 2006

Published
2006
Full Text
View/download PDF

34. Mechanism of the close-to-threshold production of the eta meson

Author

Czyzykiewicz, R., Moskal, P., Adam, H. -H., Budzanowski, A., Czerwinski, E., Gil, D., Grzonka, D., Hodana, M., Janusz, M., Jarczyk, L., Kamys, B., Khoukaz, A., Kilian, K., Klaja, P., Lorentz, B., Oelert, W., Piskor-Ignatowicz, C., Przerwa, J., Rejdych, B., Ritman, J., Sefzick, T., Siemaszko, M., Smyrski, J., Taeschner, A., Ulbrich, K., Winter, P., Wolke, M., Wuestner, P., and Zipper, W.

Subjects
High Energy Physics - Experiment (hep-ex), Nuclear Theory, FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment, High Energy Physics - Experiment
Abstract

Measurements of the analysing power for the p(pol)p --> ppeta reaction have been performed in the close-to-threshold energy region at beam momenta of p_{beam}=2.010 and 2.085 GeV/c, corresponding to excess energies of Q=10 and 36 MeV, respectively. The determined analysing power is essentially consistent with zero implying that the eta meson is produced predominantly in the s-wave at both excess energies. The angular dependence of the analysing power, combined with the hitherto determined isospin dependence of the total cross section for the eta meson production in nucleon-nucleon collisions, reveal a statistically significant indication that the excitation of the nucleon to the S_{11}(1535) resonance, the process which intermediates the production of the eta meson, is predominantly due to the exchange of the pi meson between the colliding nucleons., 4 pages, 4 figures, content added

Published
2006
Full Text
View/download PDF

35. Centrality and pseudorapidity dependence of elliptic flow for charged hadrons in Au+Au collisions atsNN=200GeV

Author

J. Sagerer, George Stephans, A. Sukhanov, E. García, Jaw-Luen Tang, Alice Mignerey, R. Bindel, A. Iordanova, Inkyu Park, David Jonathan Hofman, N. George, Gunther Roland, P. Sawicki, Wit Busza, W. Skulski, L. P. Remsberg, R. Pak, P. Kulinich, B. B. Back, Burt Holzman, R. Holynski, C. Vale, Heinz Pernegger, M. Reuter, Matthew Nguyen, M. D. Baker, P. Sarin, C. Halliwell, W. T. Lin, Bolek Wyslouch, N. Khan, Chia-Ming Kuo, R. S. Hollis, W. Kucewicz, G. Van Nieuwenhuizen, Marguerite Tonjes, M. Ballintijn, J. L. Kane, D. McLeod, A. H. Wuosmaa, S. Manly, L.J. Rosenberg, A. Budzanowski, J. Hamblen, C. Reed, Andrzej Olszewski, Gabor Istvan Veres, D. S. Barton, M. P. Decowski, K. Gulbrandsen, Peter Steinberg, A. A. Bickley, S. Gushue, J. Katzy, Christof Roland, K. Woniak, G. A. Heintzelman, F. L. H. Wolfs, E. Johnson, A. S. Carroll, R. Verdier, Russell Richard Betts, Conor Henderson, Rachid Nouicer, Adam Trzupek, and Barbara Wosiek

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Particle physics, 010308 nuclear & particles physics, Hadron, Elliptic flow, 01 natural sciences, Particle identification, Charged particle, Nuclear physics, Pseudorapidity, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider, Energy (signal processing)
Abstract

This Rapid Communication describes the measurement of elliptic flow for charged particles in Au+Au collisions at {radical}(s{sub NN})=200 GeV using the PHOBOS detector at the Relativistic Heavy Ion Collider. The measured azimuthal anisotropy is presented over a wide range of pseudorapidity for three broad collision centrality classes for the first time at this energy. Two distinct methods of extracting the flow signal were used to reduce systematic uncertainties. The elliptic flow falls sharply with increasing |{eta}| at 200 GeV for all the centralities studied, as observed for minimum-bias collisions at {radical}(s{sub NN})=130 GeV.

Published
2005

36. A precision determination of the mass of the $\eta$ meson

Author

R. Jahn, Colin Wilkin, G. Martinska, M. Smiechowicz, Vishwajeet Jha, H. J. Stein, M. Lesiak, Hartmut Machner, K. Kilian, P. von Rossen, T. Kutsarova, D. Protic, A. Budzanowski, I.M. Sitnik, M. Kravcikova, Di. Kirillov, A. Magiera, R. Tsenov, D. Kolev, G. Vankova, D. Prasuhn, S. Kliczewski, J. Urban, R. Siudak, M. Abdel-Bary, S. Nedev, J. Ernst, B. J. Roy, R. Maier, J. Lieb, A. Chatterjee, P. Hawranek, N.M. Piskunov, and M. Ulicny

Subjects
Nuclear and High Energy Physics, Particle physics, Meson production, Meson, eta meson production, meson mass, Nuclear Theory, Juelich COSY PS, mass [eta], High Energy Physics - Experiment, Nuclear physics, 0.804 GeV/c, nuclear reaction [p deuteron], +helium-3+eta%22">p deuteron --> helium-3 eta, ddc:530, Nuclear Experiment, Spectrograph, hadroproduction [pi+], Physics, hadroproduction [eta], exclusive reaction [p p], +deuteron+pi%2B%22">p p --> deuteron pi+, experimental results [magnetic spectrometer], missing-mass [mass spectrum], +helium-3+anything%22">p deuteron --> helium-3 anything, High Energy Physics::Experiment
Abstract

Several processes of meson production in proton-deuteron collisions have been measured simultaneously using a calibrated magnetic spectrograph. Among these processes, the $\eta$ meson is seen clearly as a sharp missing--mass peak on a slowly varying background in the $p+d\to ^3\textrm{He} +X$ reaction. Knowing the kinematics of the other reactions with well determined masses, it is possible to deduce a precise mass for the $\eta$ meson. The final result, $m(\eta)=547.311\pm 0.028 \textrm{(stat)} \pm 0.032 \textrm{(syst) MeV/c}^2$, is significantly lower than that found by the recent NA48 measurement, though it is consistent with values obtained in earlier counter experiments., Comment: 10 pages, 6 figures, Fig. 3 changed

Published
2005

37. Energy Dependence of Elliptic Flow over a Large Pseudorapidity Range inAu+AuCollisions at the BNL Relativistic Heavy Ion Collider

Author

Alice Mignerey, H. Seals, R. Bindel, Chia-Ming Kuo, Inkyu Park, M. Ballintijn, N. George, A. Budzanowski, W. Skulski, David Jonathan Hofman, J. Hamblen, K. Gulbrandsen, A. Iordanova, W. T. Lin, Burt Holzman, J. Katzy, P. Sarin, Andrzej Olszewski, Rachid Nouicer, Adam Trzupek, Edward Allen Wenger, C. Vale, Heinz Pernegger, R. Holynski, Christof Roland, Barbara Wosiek, P. Kulinich, Gunther Roland, A. H. Wuosmaa, F. L. H. Wolfs, Marguerite Tonjes, D. McLeod, B. B. Back, N. Khan, M. P. Decowski, A. Sukhanov, C. Reed, M. Hauer, I. Sedykh, George Stephans, E. García, R. S. Hollis, G. Van Nieuwenhuizen, Wit Busza, D. S. Barton, A. A. Bickley, T. Gburek, J. L. Kane, S. Manly, Z. Chai, R. Pak, J. Sagerer, Russell Richard Betts, Conor Henderson, Jaw-Luen Tang, A. S. Carroll, R. Verdier, C. Halliwell, W. Kucewicz, S.S. Vaurynovich, M. Reuter, M. D. Baker, M. A. Stankiewicz, Gabor Istvan Veres, Peter Steinberg, E. Johnson, K. Woźniak, P. Sawicki, L. P. Remsberg, C. E. Smith, Bolek Wyslouch, L.J. Rosenberg, S. Gushue, and G. A. Heintzelman

Subjects
Physics, Range (particle radiation), Particle physics, 010308 nuclear & particles physics, Elliptic flow, General Physics and Astronomy, Linearity, 01 natural sciences, Charged particle, Nuclear physics, Pseudorapidity, 0103 physical sciences, Particle, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider, Beam (structure)
Abstract

This Letter describes the measurement of the energy dependence of elliptic flow for charged particles in Au+Au collisions using the PHOBOS detector at the Relativistic Heavy Ion Collider. Data taken at collision energies of square root of s(NN)=19.6, 62.4, 130, and 200 GeV are shown over a wide range in pseudorapidity. These results, when plotted as a function of eta(')=|eta|-y(beam), scale with approximate linearity throughout eta('), implying no sharp changes in the dynamics of particle production as a function of pseudorapidity or increasing beam energy.

Published
2005

38. New results on the pd to 3He eta production from threshold up to Q = 40 MeV

Author

Adam, H. H., Alfons Khoukaz, Moskal, P., Piskor-Ignatowicz, C., Przerwa, J., Smyrski, J., Grzonka, D., Kilian, K., Oelert, W., Sefzick, T., Winter, P., Wolke, M., Lang, N., Wüstner, P., Budzanowski, A., Rozek, T., Siemaszko, M., Zipper, W., Lister, T., Santo, R., Steltenkamp, S., Czyzykiewicz, R., Janusz, M., Jarczyk, L., and Kamys, B.

Subjects
hadroproduction [eta], quasi-bound states, Nuclear Theory, Cracow 2004/06/04 [talk], Juelich COSY PS, final-state interaction, angular distribution [eta], near threshold meson production, nuclear reaction [p deuteron], final state interaction, threshold, +helium-3+eta%22">p deuteron --> helium-3 eta, High Energy Physics::Experiment, ddc:530, energy dependence [cross section], Nuclear Experiment, effect [resonance], experimental results
Abstract

Measurements on the eta meson production in proton-deuteron collisions have been performed using the COSY-11 facility at COSY (Julich). Here we present preliminary results on total and differential cross sections for the pd -> He-3 eta reaction at five excess energies between Q = 5.1 and Q = 40.6 MeV. The obtained angular distributions for the emitted eta mesons in the center of mass system expose a transition from an almost isotropic emission to a highly anisotropic distribution. The extracted total cross sections support a strong eta-He-3 final state interaction and will be compared with model predictions.

Published
2005

39. A precision determination of the mass of the $��$ meson

Author

The GEM Collaboration, Abdel-Bary, M., Budzanowski, A., Chatterjee, A., Ernst, J., Hawranek, P., Jahn, R., Jha, V., Kilian, K., Kliczewski, S., Kirillov, D., Kolev, D., Kravcikova, M., Kutsarova, T., Lesiak, M., Lieb, J., Machner, H., Magiera, A., Maier, R., Martinska, G., Nedev, S., Piskunov, N., Prasuhn, D., Proti��, D., von Rossen, P., Roy, B. J., Sitnik, I., Siudak, R., Smiechowicz, M., Stein, H. J., Tsenov, R., Ulicny, M., Urban, J., and Vankova, G.

Subjects
High Energy Physics - Experiment (hep-ex), Nuclear Theory, FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

Several processes of meson production in proton-deuteron collisions have been measured simultaneously using a calibrated magnetic spectrograph. Among these processes, the $��$ meson is seen clearly as a sharp missing--mass peak on a slowly varying background in the $p+d\to ^3\textrm{He} +X$ reaction. Knowing the kinematics of the other reactions with well determined masses, it is possible to deduce a precise mass for the $��$ meson. The final result, $m(��)=547.311\pm 0.028 \textrm{(stat)} \pm 0.032 \textrm{(syst) MeV/c}^2$, is significantly lower than that found by the recent NA48 measurement, though it is consistent with values obtained in earlier counter experiments., 10 pages, 6 figures, Fig. 3 changed

Published
2005
Full Text
View/download PDF

40. Production of eta meson in proton-proton collisions

Author

Czyzykiewicz, R., Adam, H. H., Kowina, P., Moskal, P., Oelert, W., Piskor-Ignatowicz, C., Przerwa, J., Rozek, T., Santo, R., Sefzick, T., Siemaszko, M., Smyrski, J., Budzanowski, A., Täschner, A., Winter, P., Wolke, M., Wüstner, P., Zipper, W., Grzonka, D., Janusz, M., Jarczyk, L., Kamys, B., Khoukaz, A., Kilian, K., and Klaja, P.

Subjects
hadroproduction [eta], channel cross section, close-to-threshold meson production, High Energy Physics::Phenomenology, Nuclear Theory, partial wave, Cracow 2004/06/04 [talk], eta-N interaction, +2p+eta%22">p p --> 2p eta, eta, mass spectrum, polarized beam [p], correlation [spin], threshold, analysing power, Physics::Accelerator Physics, analyzing power, High Energy Physics::Experiment, ddc:530, polarized target [p], angular distribution, Nuclear Experiment, inclusive reaction [p p], experimental results
Abstract

A brief experimental overview on the close-to-threshold eta meson production in proton-proton interactions is presented and the available observables in measurements with unpolarized and polarized beam and target are discussed.

Published
2005

41. Particle production at very low transverse momenta inAu+Aucollisions atsNN=200GeV

Author

C. Halliwell, P. Sawicki, A. S. Carroll, R. Verdier, David Jonathan Hofman, Barbara Wosiek, E. García, R. Holynski, Inkyu Park, Gunther Roland, S. Gushue, D. McLeod, J. Sagerer, C. Vale, Heinz Pernegger, B. B. Back, Christof Roland, K. Gulbrandsen, Jaw-Luen Tang, A. H. Wuosmaa, Russell Richard Betts, Conor Henderson, G. A. Heintzelman, J. Katzy, P. Sarin, F. L. H. Wolfs, L. P. Remsberg, W. T. Lin, S. G. Steadman, R. S. Hollis, Rachid Nouicer, Adam Trzupek, A. Iordanova, Chia-Ming Kuo, P. Kulinich, M. Ballintijn, M. P. Decowski, J. Hamblen, N. Khan, M. Reuter, Alice Mignerey, M. D. Baker, R. Bindel, J. L. Kane, Bolek Wyslouch, D. S. Barton, S. Manly, A. A. Bickley, L.J. Rosenberg, C. Reed, George Stephans, A. Budzanowski, N. George, A. Olszewski, Krzysztof Woźniak, W. Skulski, Burt Holzman, Peter Steinberg, G. Van Nieuwenhuizen, E. Johnson, W. Kucewicz, A. Sukhanov, Wit Busza, and R. Pak

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Nuclear Theory, Extrapolation, 7. Clean energy, 01 natural sciences, Particle identification, Spectral line, Charged particle, Nuclear physics, Transverse plane, Pion, Antiproton, 0103 physical sciences, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider
Abstract

We present results on charged particle production at very low transverse momenta in the 15% most central Au+Au collisions at {radical}(s{sub NN})=200 GeV obtained with the PHOBOS detector at the Relativistic Heavy Ion Collider. The invariant yields were measured at midrapidity in the transverse momentum ranges from 30 to 50 MeV/c for charged pions, 90 to 130 MeV/c for charged kaons and 140 to 210 MeV/c for protons and antiprotons. No significant enhancement in low transverse momentum particle production is observed as compared to extrapolations of identified particle spectra measured at an intermediate p{sub T} range. The spectra tend to flatten at low p{sub T}, consistent with the expectations of transverse expansion of the system.

Published
2004

42. New results on the pd --> 3He eta production near threshold

Author

Michał Janusz, W. Zipper, D. Grzonka, R. Santo, J. Przerwa, Rafał Czyżykiewicz, H.-H. Adam, Magnus Wolke, T. Sefzick, P. Wuestner, M. Siemaszko, Cezary Piskor-Ignatowicz, T. Lister, L. Jarczyk, S. Steltenkamp, P. Winter, A. Budzanowski, A. Khoukaz, K. Kilian, N. Lang, W. Oelert, Paweł Moskal, B. Kamys, Jerzy Smyrski, and T. Rozek

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, Isotropy, Eta meson, Nuclear Theory, Astronomy and Astrophysics, Atomic and Molecular Physics, and Optics, High Energy Physics - Experiment, Nuclear physics, Near threshold, Distribution (mathematics), High Energy Physics::Experiment, Center of mass, Anisotropy, Nuclear Experiment
Abstract

Measurements on the eta meson production in proton-deuteron collisions have been performed using the COSY-11 facility at COSY Juelich. Here we present preliminary results on total and differential cross sections for the pd --> 3He eta reaction at five excess energies between Q = 5.1 and Q = 40.6 MeV. The obtained angular distributions for the emitted eta mesons in the center of mass system expose a transition from an almost isotropic emission to a highly anisotropic distribution. The extracted total cross sections support a strong eta-3He final state interaction and will be compared with model predictions., Comment: Presented at MESON 2004: 8th International Workshop on Meson Production, Properties and Interactions, Cracow, Poland, 4-8 Jun 2004, 3 pages, Submitted to Int. J. Mod. Phys. A

Published
2004

43. Collision geometry scaling ofAu+Aupseudorapidity density fromsNN=19.6to200GeV

Author

Russell Richard Betts, Conor Henderson, David Jonathan Hofman, R. Holynski, Krzysztof Woźniak, L. P. Remsberg, C. Vale, Heinz Pernegger, N. George, P. Kulinich, W. Skulski, Marguerite Tonjes, Burt Holzman, Inkyu Park, A. Sukhanov, P. Sarin, George Stephans, J. L. Kane, C. Reed, J. Sagerer, Chia-Ming Kuo, Rachid Nouicer, Wit Busza, R. Pak, Adam Trzupek, S. Manly, W. T. Lin, M. Ballintijn, R. S. Hollis, Jaw-Luen Tang, K. Gulbrandsen, W. Kucewicz, Andrzej Olszewski, J. Hamblen, Christof Roland, N. Khan, A. Iordanova, A. Budzanowski, J. Katzy, F. L. H. Wolfs, E. García, A. H. Wuosmaa, D. S. Barton, A. A. Bickley, B. B. Back, M. Reuter, M. D. Baker, Alice Mignerey, R. Bindel, Peter Steinberg, D. McLeod, E. Johnson, M. P. Decowski, G. Van Nieuwenhuizen, Gunther Roland, Barbara Wosiek, C. Halliwell, A. S. Carroll, R. Verdier, P. Sawicki, Bolek Wyslouch, L.J. Rosenberg, S. Gushue, and G. A. Heintzelman

Subjects
Systematic error, Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, 01 natural sciences, Charged particle, Nuclear physics, Pseudorapidity, 0103 physical sciences, High Energy Physics::Experiment, Multiplicity (chemistry), Nuclear Experiment, 010306 general physics, Centrality, Scaling
Abstract

The centrality dependence of the midrapidity charged particle multiplicity in $\mathrm{Au}+\mathrm{Au}$ heavy-ion collisions at $\sqrt{{s}_{NN}}=19.6$ and $200\phantom{\rule{0.3em}{0ex}}\mathrm{GeV}$ is presented. Within a simple model, the fraction of hard (scaling with number of binary collisions) to soft (scaling with number of participant pairs) interactions is consistent with a value of $x=0.13\ifmmode\pm\else\textpm\fi{}0.01(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.05(\mathrm{syst})$ at both energies. The experimental results at both energies, scaled by inelastic $p(\overline{p})+p$ collision data, agree within systematic errors. The ratio of the data was found not to depend on centrality over the studied range and yields a simple linear scale factor of ${R}_{200∕19.6}=2.03\ifmmode\pm\else\textpm\fi{}0.02(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.05(\mathrm{syst})$.

Published
2004

44. Flow in Au+Au Collisions at RHIC

Author

Marguerite Belt Tonjes, (for the PHOBOS Collaboration), B B Back, M D Baker, M Ballintijn, D S Barton, R R Betts, A A Bickley, R Bindel, A Budzanowski, W Busza, A Carroll, M P Decowski, E García, N George, K Gulbrandsen, S Gushue, C Halliwell, J Hamblen, G A Heintzelman, C Henderson, D J Hofman, R S Hollis, R Ho y ski, B Holzman, A Iordanova, E Johnson, J L Kane, J Katzy, N Khan, W Kucewicz, P Kulinich, C M Kuo, W T Lin, S Manly, D McLeod, A C Mignerey, R Nouicer, A Olszewski, R Pak, I C Park, H Pernegger, C Reed, L P Remsberg, M Reuter, C Roland, G Roland, L Rosenberg, J Sagerer, P Sarin, P Sawicki, W Skulski, P Steinberg, G S F Stephans, A Sukhanov, J-L Tang, A Trzupek, C Vale, G J van Nieuwenhuizen, R Verdier, F L H Wolfs, B Wosiek, K Wozniak, A H Wuosmaa, and B Wys ouch

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Detector, FOS: Physical sciences, 01 natural sciences, Nuclear physics, Flow (mathematics), Pseudorapidity, 0103 physical sciences, Transverse momentum, Heavy ion, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment
Abstract

The study of flow can provide information on the initial state dynamics and the degree of equilibration attained in heavy ion collisions. This contribution presents results for both elliptic and directed flow as determined from data recorded by the PHOBOS experiment in Au+Au runs at RHIC at sqrt(sNN) = 19.6, 130 and 200 GeV. The PHOBOS detector provides a unique coverage in pseudorapidity for measuring flow at RHIC. The systematic dependence of flow on pseudorapidity, transverse momentum, centrality and energy is discussed., 4 pages, 4 figures, Quark Matter 2004 proceedings

Published
2004

45. Production of η and ηʹ mesons via the quasi-free proton-neutron interaction

Author

W. Zipper, G. Schepers, Cezary Piskor-Ignatowicz, L. Jarczyk, P. Kowina, Jerzy Smyrski, A. Budzanowski, T. Rozek, T. Sefzick, P. Winter, Rafał Czyżykiewicz, A. Täschner, A. Strzałkowski, A. Khoukaz, B. Kamys, Paweł Moskal, P. Wüstner, K. Kilian, W. Oelert, H.-H. Adam, D. Grzonka, M. Siemaszko, T. Johansson, Michał Janusz, R. Santo, J. Przerwa, and M. Wolke

Subjects
Physics, Excitation function, Proton, Meson, Nuclear Theory, High Energy Physics::Phenomenology, Hadron, Elementary particle, Baryon, Nuclear physics, High Energy Physics::Experiment, Neutron, Nuclear Experiment, Nucleon
Abstract

A comparison of the close‐to‐threshold total cross sections for the η′ meson production in both the pp → ppη′ and pn → pnη′ reactions should provide insight into the flavour‐singlet (perhaps also into gluonium) content of the η′ meson and the relevance of quark‐gluon or hadronic degrees of freedom in the creation process. The excitation function for the reaction pp → ppη′ has been already established. At present, experimental investigations of the quasi‐free pn → pnX reactions are carried out at the COSY‐11 facility using a beam of stochastically cooled protons and the deuteron cluster target. A method of measurement and preliminary results from the test experiments of the pn → pnη reaction are presented in this report.

Published
2004

46. Measurement of the transverse polarization of the e+ from the decay of polarized μ+

Author

L. Jarczyk, A. Strzałkowski, A. von Allmen, Stanisław Kistryn, E. Stephan, A. Kozela, N. Danneberg, Jerzy Smyrski, Jacek Zejma, C. Hilbes, W. Fetscher, Kazimierz Bodek, K. Köhler, Klaus Kirch, J. Lang, and A. Budzanowski

Subjects
Physics, Nuclear physics, Coupling constant, Transverse plane, Muon, Annihilation, Positron, Physics::Accelerator Physics, High Energy Physics::Experiment, Electron, Muon spin spectroscopy, Polarization (waves)
Abstract

The transverse polarization components of the positrons from the decay of polarized muons have been measured at the Paul Scherrer Institute by annihilating in flight the decay positrons with polarized electrons. The use of a stroboscopic method greatly reduces systematic errors. The energy dependence of the transverse polarization component PT1, which lies in the plane spanned by muon spin and positron momentum, yields the low energy parameter η and thus an improved model‐independent value of the Fermi coupling constant. A non‐zero value of the transverse component PT2, which is perpendicular to the plane mentioned above, would be the first observation of time reversal violation in a purely leptonic decay. Part of the data (40 × 108 annihilation events) have been evaluated. Both PT1 and PT2, averaged over the positrons’ energy, are consistent with zero with a precision improved by a factor of three as compared with the previous measurement. The preliminary results are 〈PT1〉 = (7 ± 8) × 10−3, 〈PT2〉 = (−1 ±...

Published
2004

47. Threshold Hyperon Production at COSY-11

Author

Rozek, T., Moskal, P., Adam, H. -H., Budzanowski, A., Czyzykiewicz, R., Grzonka, D., Janusz, M., Jarczyk, L., Kamys, B., Khoukaz, A., Kilian, K., Klaja, P., Kowina, P., Oelert, W., Piskor-Ignatowicz, C., Przerwa, J., Santo, R., Sefzick, T., Siemaszko, M., Smyrski, J., Strzalkowski, A., Taschner, A., Winter, P., Wolke, M., Wustner, P., and Zipper, W.

Subjects
associated production [K+], Nuclear and High Energy Physics, Particle physics, +Lambda+K%2B+p%22">p p --> Lambda K+ p, FOS: Physical sciences, Juelich COSY PS, energy dependence, +Sigma0+K%2B+p%22">p p --> Sigma0 K+ p, hyperon production, exchange [meson], threshold, Production (economics), ddc:530, ratio [channel cross section], Nuclear Experiment (nucl-ex), Nuclear Experiment, Physics, exclusive reaction [p p], Lambda, experimental results [magnetic spectrometer], Y-N interaction, Sigma0, Hyperon, Astronomy and Astrophysics, Atomic and Molecular Physics, and Optics, Order (business), interference [meson], High Energy Physics::Experiment, hadroproduction [hyperon], talk, Sigma+, +Sigma%2B+K%2B+n%22">p p --> Sigma+ K+ n
Abstract

The Lambda, Sigma0 and Sigma+ hyperon production in NN collisions is studied at the COSY - 11 installation in order to investigate the production mechanism as well as to extract information about the Y-N interaction., Comment: 3 pages, 2 figures

Published
2004
Full Text
View/download PDF

48. New results on the pd --> 3He eta production near threshold

Author

Adam, H. -H., Khoukaz, A., Lang, N., Lister, T., Santo, R., Steltenkamp, S., Czyzykiewicz, R., Janusz, M., Jarczyk, L., Kamys, B., Moskal, P., Piskor-Ignatowicz, C., Przerwa, J., Smyrski, J., Grzonka, D., Kilian, K., Oelert, W., Sefzick, T., Winter, P., Wolke, M., Wuestner, P., Budzanowski, A., Rozek, T., Siemaszko, M., and Zipper, W.

Subjects
High Energy Physics - Experiment (hep-ex), Nuclear Theory, FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment
Abstract

Measurements on the eta meson production in proton-deuteron collisions have been performed using the COSY-11 facility at COSY Juelich. Here we present preliminary results on total and differential cross sections for the pd --> 3He eta reaction at five excess energies between Q = 5.1 and Q = 40.6 MeV. The obtained angular distributions for the emitted eta mesons in the center of mass system expose a transition from an almost isotropic emission to a highly anisotropic distribution. The extracted total cross sections support a strong eta-3He final state interaction and will be compared with model predictions., Presented at MESON 2004: 8th International Workshop on Meson Production, Properties and Interactions, Cracow, Poland, 4-8 Jun 2004, 3 pages, Submitted to Int. J. Mod. Phys. A

Published
2004
Full Text
View/download PDF

49. Centrality Dependence of Charged-Hadron Transverse-Momentum Spectra ind+AuCollisions atsNN=200 GeV

Author

P. Kulinich, Alice Mignerey, R. Bindel, David Jonathan Hofman, C. Halliwell, K. Gulbrandsen, J. Zhang, George Stephans, W. T. Lin, T. Gburek, Christof Roland, B.F. Wadsworth, Bruce Becker, N. Khan, C. E. Smith, Andrzej Olszewski, N. George, M. P. Decowski, W. Skulski, F. L. H. Wolfs, Burt Holzman, A. H. Wuosmaa, Bolek Wyslouch, R. S. Hollis, P. Sarin, Russell Richard Betts, Conor Henderson, P. Sawicki, L. P. Remsberg, Krzysztof Woźniak, Inkyu Park, D. S. Barton, S. Gushue, Rachid Nouicer, Adam Trzupek, A. A. Bickley, C. Vale, Heinz Pernegger, J. Sagerer, B. B. Back, I. Sedykh, Barbara Wosiek, Marguerite Tonjes, A. Sukhanov, G. Van Nieuwenhuizen, C. Reed, J. L. Kane, Gabor Istvan Veres, S. Manly, Wit Busza, R. Pak, Peter Steinberg, E. Johnson, R. Teng, A. S. Carroll, R. Verdier, A. Budzanowski, Jeongwon Lee, A. S. Harrington, Gunther Roland, A. Noell, A. Iordanova, Chia-Ming Kuo, M. D. Baker, M. Ballintijn, J. Hamblen, R. Holynski, and E. García

Subjects
Physics, Nuclear reaction, Range (particle radiation), Particle physics, 010308 nuclear & particles physics, Hadron, General Physics and Astronomy, Elementary particle, Nuclear matter, 01 natural sciences, Spectral line, Nuclear physics, Transverse plane, Pseudorapidity, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics
Abstract

We have measured transverse momentum distributions of charged hadrons produced in d+Au collisions at sqrt[s(NN)]=200 GeV. The spectra were obtained for transverse momenta 0.25

Published
2003

50. Ratios of charged antiparticles to particles near midrapidity inAu+Aucollisions atsNN=200GeV

Author

P. Sawicki, Adam Trzupek, L. P. Remsberg, Inkyu Park, A. Sukhanov, Heinz Pernegger, A. Budzanowski, C. Reed, Krzysztof Wozniak, R. Teng, Barbara Wosiek, Gunther Roland, E. García, George S. F. Stephans, Wit Busza, R. Pak, Russell Richard Betts, Conor Henderson, Christophe Pol A Roland, K. Gulbrandsen, P. Kulinich, P. Sarin, G. J. van Nieuwenhuizen, R. S. Hollis, N. George, W. Kucewicz, N. Khan, W. Skulski, M. P. Decowski, M. Reuter, Burt Holzman, Bolek Wyslouch, J. L. Kane, D. S. Barton, Chia-Ming Kuo, L.J. Rosenberg, A. S. Carroll, J. Sagerer, S. Manly, A. A. Bickley, P. Steinberg, M. Ballintijn, J. Hamblen, J. Michałowski, C. Halliwell, B.F. Wadsworth, Marek Stodulski, E. Johnson, R. Verdier, D. J. Hofman, S. Gushue, G. A. Heintzelman, C. Vale, B. B. Back, S.G. Steadman, F. L. H. Wolfs, Judith Katzy, W. T. Lin, Rachid Nouicer, Andrzej Olszewski, Baker, D. McLeod, A. H. Wuosmaa, Alice Mignerey, R. Bindel, A. Iordanova, Jau Tang, and R. Holynski

Subjects
Physics, Nuclear and High Energy Physics, Antiparticle, 010308 nuclear & particles physics, Transport theory, 01 natural sciences, 7. Clean energy, Nuclear physics, Baryon, Pion, 0103 physical sciences, Particle, High Energy Physics::Experiment, Rapidity, Astrophysics::Earth and Planetary Astrophysics, Nuclear Experiment, 010306 general physics
Abstract

The ratios of charged antiparticles to particles have been obtained for pions, kaons and protons near midrapidity in central Au+Au collisions at sqrt(s_NN) = 200 GeV. Ratios of / = 1.025 +/- 0.006 (stat.) +/- 0.018 (syst.), / = 0.95 +/- 0.03 (stat.) +/- 0.03 (syst.) and / = 0.73 +/- 0.02 (stat.) +/- 0.03 (syst.) have been observed. The / and / ratios are consistent with a baryochemical potential mu_B of 27 MeV, roughly a factor of 2 smaller than in sqrt(s_NN) = 130 GeV collisions. The data are compared to results from lower energies and model calculations. Our accurate measurements of the particle ratios impose stringent constraints on current and future models dealing with baryon production and transport.

Published
2003

Catalog

Books, media, physical & digital resources
See catalog results