-
M. Bazzi,
G. Beer,
C. Berucci,
L. Bombelli,
A. M. Bragadireanu,
M. Cargnelli,
C. Curceanu,
A. d'Uffizi,
C. Fiorini,
T. Frizzi, [......],
A. Scordo,
H. Shi,
D. L. Sirghi,
F. Sirghi,
H. Tatsuno,
A. Tudorache, V. Tudorache,
O. Vazquez Doce,
E. Widmann,
J. Zmeskal
[show abstract]
[hide abstract]
ABSTRACT: The study of the KbarN system at very low energies plays a key role for the
understanding of the strong interaction between hadrons in the strangeness
sector. At the DAFNE electron-positron collider of Laboratori Nazionali di
Frascati we studied kaonic atoms with Z=1 and Z=2, taking advantage of the
low-energy charged kaons from Phi-mesons decaying nearly at rest. The SIDDHARTA
experiment used X-ray spectroscopy of the kaonic atoms to determine the
transition yields and the strong interaction induced shift and width of the
lowest experimentally accessible level (1s for H and D and 2p for He). Shift
and width are connected to the real and imaginary part of the scattering
length. To disentangle the isospin dependent scattering lengths of the
antikaon-nucleon interaction, measurements of Kp and of Kd are needed. We
report here on an exploratory deuterium measurement, from which a limit for the
yield of the K-series transitions was derived: Y(K_tot)<0.0143 and
Y(K_alpha)<0.0039 (CL 90%). Also, the upcoming SIDDHARTA-2 kaonic deuterium
experiment is introduced.
02/2013;
-
M Bazzi,
G Beer,
L Bombelli,
A M Bragadireanu,
M Cargnelli,
C Curceanu Petrascu,
A Dʼuffizi,
C Fiorini,
T Frizzi,
F Ghio, [......],
H Shi,
D L Sirghi,
F Sirghi,
H Tatsuno,
A Tudorache, V Tudorache,
O Vazquez Doce,
B Wünschek,
E Widmann,
J Zmeskal
[show abstract]
[hide abstract]
ABSTRACT: The kaonic (3)He and (4)He X-rays emitted in the [Formula: see text] transitions were measured in the SIDDHARTA experiment. The widths of the kaonic (3)He and (4)He 2p states were determined to be [Formula: see text], and [Formula: see text], respectively. Both results are consistent with the theoretical predictions. The width of kaonic (4)He is much smaller than the value of [Formula: see text] determined by the experiments performed in the 70's and 80's, while the width of kaonic (3)He was determined for the first time.
Physics Letters B 07/2012; 714(1):40-43. · 3.95 Impact Factor
-
The SIDDHARTA collaboration,
M. Bazzi,
G. Beer,
L. Bombelli,
A. M. Bragadireanu,
M. Cargnelli,
C. Curceanu,
A. d'Uffizi,
C. Fiorini,
T. Frizzi, [......],
H. Shi,
D. L. Sirghi,
F. Sirghi,
H. Tatsuno,
A. Tudorache, V. Tudorache,
O. Vazquez Doce,
B. Wunschek,
E. Widmann,
J. Zmeskal
[show abstract]
[hide abstract]
ABSTRACT: The kaonic 3He and 4He X-rays emitted in the 3d-2p transitions were measured
in the SIDDHARTA experiment. The widths of the kaonic 3He and 4He 2p states
were determined to be Gamma_2p(3He) = 6 \pm 6 (stat.) \pm 7 (syst.) eV, and
Gamma_2p(4He) = 14 \pm 8 (stat.) \pm 5 (syst.) eV, respectively. Both results
are consistent with the theoretical predictions. The width of kaonic 4He is
much smaller than the value of 55 \pm 34 eV determined by the experiments
performed in the 70's and 80's, while the width of kaonic 3He was determined
for the first time.
Physics Letters B 05/2012; 714:40-43. · 3.95 Impact Factor
-
C. Curceanu (Petrascu,
M. Bazzi,
G. Beer,
L. Bombelli,
A. M. Bragadireanu,
M. Cargnelli,
G. Corradi,
A. d’Uffizi,
C. Fiorini,
T. Frizzi, [......],
A. Scordo,
H. Shi,
D. L. Sirghi,
F. Sirghi,
H. Tatsuno,
A. Tudorache, V. Tudorache,
O. Vazquez Doce,
E. Widmann,
J. Zmeskal
[show abstract]
[hide abstract]
ABSTRACT: The DAΦNE electron–positron collider at the Laboratori Nazionali di Frascati of INFN has made available a unique quality low-energy
negative kaons “beam”. The SIDDHARTA experiment used this beam to perform unprecedented precision measurements on kaonic atoms,
while the AMADEUS experiment plans to perform in the coming years precision measurements on kaon–nuclei interactions at low-energies,
in particular to study the kaonic nuclei. The two experiments are briefly presented in this paper.
Few-Body Systems 04/2012; 50(1):447-449. · 1.44 Impact Factor
-
M. Bazzi,
G. Beer,
L. Bombelli,
A. M. Bragadireanu,
M. Cargnelli,
G. Corradi,
C. Curceanu,
A. d'Uffizi,
C. Fiorini,
T. Frizzi, [......],
A. Scordo,
H. Shi,
D. L. Sirghi,
F. Sirghi,
H. Tatsuno,
A. Tudorache, V. Tudorache,
O. Vazquez Doce,
E. Widmann,
J. Zmeskal
[show abstract]
[hide abstract]
ABSTRACT: Kaonic hydrogen atoms provide a unique laboratory to probe the kaon-nucleon
strong interaction at the energy threshold, allowing an investigation of the
interplay between spontaneous and explicit chiral symmetry breaking in
low-energy QCD. The SIDDHARTA Collaboration has measured the $K$-series X rays
of kaonic hydrogen atoms at the DA$\Phi$NE electron-positron collider of
Laboratori Nazionali di Frascati, and has determined the most precise values of
the strong-interaction induced shift and width of the $1s$ atomic energy level.
This result provides vital constraints on the theoretical description of the
low-energy $\bar{K}N$ interaction.
01/2012;
-
T. Ishiwatari,
M. Bazzi,
G Beer,
C. Berucci,
L. Bombelli,
A. M. Bragadireanu,
M. Cargnelli,
A. Clozza,
G. Corradi,
C. Curceanu, [......],
H. Shi,
D. L. Sirghi,
F. Sirghi,
H. Tatsuno,
A. Tudorache, V. Tudorache,
O. Vazquez Doce,
E. Widmann,
B. Wuenschek,
J. Zmeskal
[show abstract]
[hide abstract]
ABSTRACT: The strong-interaction shift of kaonic 3He and 4He 2p states was measured
using gaseous targets for the first time in the SIDDHARTA experiment. The
determined shift of kaonic 4He is much smaller than the values obtained in the
experiments performed in 70's and 80's. Thus, the problems in kaonic helium
(the "kaonic helium puzzle") was definitely solved by our measurements. The
first observation of the kaonic 3He X-rays was also achieved. The shift both of
kaonic 3He and 4He was found to be as small as a few eV.
08/2011;
-
M. Bazzi,
G Beer,
L. Bombelli,
A. M. Bragadireanu,
M. Cargnelli,
G. Corradi,
C. Curceanu,
A. d'Uffizi,
C. Fiorini,
T. Frizzi, [......],
A. Scordo,
H. Shi,
D. L. Sirghi,
F. Sirghi,
H. Tatsuno,
A. Tudorache, V. Tudorache,
O. Vazquez Doce,
E. Widmann,
J. Zmeskal
[show abstract]
[hide abstract]
ABSTRACT: The $\bar{K}N$ system at threshold is a sensitive testing ground for low
energy QCD, especially for the explicit chiral symmetry breaking. Therefore, we
have measured the $K$-series x rays of kaonic hydrogen atoms at the DA$\Phi$NE
electron-positron collider of Laboratori Nazionali di Frascati, and have
determined the most precise values of the strong-interaction energy-level shift
and width of the $1s$ atomic state. As x-ray detectors, we used large-area
silicon drift detectors having excellent energy and timing resolution, which
were developed especially for the SIDDHARTA experiment. The shift and width
were determined to be $\epsilon_{1s} = -283 \pm 36 \pm 6 {(syst)}$ eV and
$\Gamma_{1s} = 541 \pm 89 {(stat)} \pm 22 {(syst)}$ eV, respectively. The new
values will provide vital constraints on the theoretical description of the
low-energy $\bar{K}N$ interaction.
05/2011;
-
M Bazzi,
G Beer,
L Bombelli,
A M Bragadireanu,
M Cargnelli,
G Corradi,
C Curceanu Petrascu,
A d'Uffizi,
C Fiorini,
T Frizzi, [......],
H Shi,
D L Sirghi,
F Sirghi,
H Tatsuno,
A Tudorache, V Tudorache,
O Vazquez Doce,
E Widmann,
B Wünschek,
J Zmeskal
[show abstract]
[hide abstract]
ABSTRACT: The first observation of the kaonic (3)He 3d→2p transition was made, using slow K- mesons stopped in a gaseous (3)He target. The kaonic atom X-rays were detected with large-area silicon drift detectors using the timing information of the K+K- pairs of ϕ-meson decays produced by the DAΦNE e+e- collider. The strong interaction shift of the kaonic (3)He 2p state was determined to be -2±2(stat)±4(syst) eV.
Physics Letters B 03/2011; 697(3-2):199-202. · 3.95 Impact Factor
-
S Okada,
M. Bazzi,
G Beer,
L. Bombelli,
A. M. Bragadireanu,
M. Cargnelli,
G. Corradi,
Curceanu (Petrascu) C,
A. d’Uffizi,
C. Fiorini, [......],
A. Scordo,
H. Shi,
D. L. Sirghi,
F. Sirghi,
H. Tatsuno,
A. Tudorache, V. Tudorache,
Vazquez Doce O,
E. Widmann,
J. Zmeskal
[show abstract]
[hide abstract]
ABSTRACT: The SIDDHARTA experiment aims at a precise measurement of K -series kaonic hydrogen x-rays and the first-ever measurement of the kaonic deuterium x-rays to determine the strong-interaction energy-level shift and width of the lowest lying atomic states. These measurements offer a unique possibility to precisely determine the isospin-dependent $ar{K}$-nucleon scattering lengths.
EPJ Web of Conferences. 01/2010;
-
The PANDA Collaboration,
W. Erni,
I. Keshelashvili,
B. Krusche,
M. Steinacher,
Y. Heng,
Z Liu,
H Liu,
X Shen,
O. Wang, [......],
M. Plominski,
J. Szewinski,
K. Traczyk,
B. Zwieglinski,
P. Buehler,
A Gruber,
P. Kienle,
J. Marton,
E. Widmann,
J. Zmeskal
[show abstract]
[hide abstract]
ABSTRACT: This document is the Technical Design Report covering the two large spectrometer magnets of the PANDA detector set-up. It shows the conceptual design of the magnets and their anticipated performance. It precedes the tender and procurement of the magnets and, hence, is subject to possible modifications arising during this process. Comment: 10 pages, 14MB, accepted by FAIR STI in May 2009, editors: Inti Lehmann (chair), Andrea Bersani, Yuri Lobanov, Jost Luehning, Jerzy Smyrski, Technical Coordiantor: Lars Schmitt, Bernd Lewandowski (deputy), Spokespersons: Ulrich Wiedner, Paola Gianotti (deputy)
PANDA Collaboration. 07/2009;
-
The PANDA Collaboration: W. Erni,
I. Keshelashvili,
B. Krusche,
M. Steinacher,
Y. Heng,
Z. Liu,
H. Liu,
X. Shen,
O. Wang,
H. Xu, [......],
M. Plominski,
J. Szewinski,
K. Traczyk,
B. Zwieglinski,
P. Buehler,
A. Gruber,
P. Kienle,
J. Marton,
E. Widmann,
J. Zmeskal
[show abstract]
[hide abstract]
ABSTRACT: This document is the Technical Design Report covering the two large
spectrometer magnets of the PANDA detector set-up. It shows the
conceptual design of the magnets and their anticipated performance. It
precedes the tender and procurement of the magnets and, hence, is
subject to possible modifications arising during this process.
06/2009;
-
PANDA Collaboration,
W. Erni,
I. Keshelashvili,
B. Krusche,
M. Steinacher,
Y. Heng,
Z Liu,
H Liu,
X Shen,
O. Wang, [......],
P. Buehler,
A Gruber,
P. Kienle,
J. Marton,
E. Widmann,
J. Zmeskal,
M. F. M. Lutz,
B. Pire,
O. Scholten,
R. Timmermans
[show abstract]
[hide abstract]
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. Comment: 216 pages
03/2009;
-
PANDA Collaboration,
W. Erni,
I. Keshelashvili,
B. Krusche,
M. Steinacher,
Y. Heng,
Z Liu,
H Liu,
X Shen,
O. Wang, [......],
M. Plominski,
J. Szewinski,
K. Traczyk,
B. Zwieglinski,
P. Buehler,
A Gruber,
P. Kienle,
J. Marton,
E. Widmann,
J. Zmeskal
[show abstract]
[hide abstract]
ABSTRACT: This document presents the technical layout and the envisaged performance of the Electromagnetic Calorimeter (EMC) for the PANDA target spectrometer. The EMC has been designed to meet the physics goals of the PANDA experiment, which is being developed for the Facility for Antiproton and Ion Research (FAIR) at Darmstadt, Germany. The performance figures are based on extensive prototype tests and radiation hardness studies. The document shows that the EMC is ready for construction up to the front-end electronics interface. Comment: 199 pages, submitted to FAIR STI on July 1st 2008, Editors: Fritz-Herbert Heinsius, Bertram Kopf, Bernd Lewandowski (Deputy Technical Coordinator), Herbert L\"ohner, Rainer Novotny (Project Coordinator), Klaus Peters, Philippe Rosier, Lars Schmitt (Technical Coordinator), Alexander Vasiliev; Spokespersons: Ulrich Wiedner, Paola Gianotti (deputy)
10/2008;
-
S Okada,
M. Bazzi,
G Beer,
L. Bombelli,
A. M. Bragadireanu,
M. Cargnelli,
G. Corradi,
A. d’Uffizi,
C. Fiorini,
T. Frizzi, [......],
A. Scordo,
H. Shi,
D. L. Sirghi,
F. Sirghi,
H. Tatsuno,
A. Tudorache, V. Tudorache,
O. Vazquez Doce,
E. Widmann,
J. Zmeskal
http://dx.doi.org/10.1051/epjconf/20100303023.
-
M. Bazzi,
G. Beer,
L. Bombelli,
A.M. Bragadireanu,
M. Cargnelli,
G. Corradi,
C. Curceanu (Petrascu,
A. d’Uffizi,
C. Fiorini,
T. Frizzi, [......],
A. Scordo,
H. Shi,
D.L. Sirghi,
F. Sirghi,
H. Tatsuno,
A. Tudorache, V. Tudorache,
O. Vazquez Doce,
E. Widmann,
J. Zmeskal
[show abstract]
[hide abstract]
ABSTRACT: Large-area silicon drift detectors (SDDs) were used for the first time in the background condition of a collider for precision spectroscopy of the kaonic atom X-rays in the SIDDHARTA experiment for the study of the strong interaction in a low-energy regime. The measurements were performed at the DAΦNE electron–positron collider (LNF, Italy), using gas targets of hydrogen, deuterium, helium-3, and helium-4. A test measurement using the kaonic 4He X-rays showed an excellent performance of the SDD devices under the beam conditions, and a good background suppression capability using the time correlation between the kaonic atom X-rays and the back-to-back correlated K+K− pairs produced by φ decays.
Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 628(1):264-267. · 1.21 Impact Factor
-
M. Bazzi,
G. Beer,
L. Bombelli,
A.M. Bragadireanu,
M. Cargnelli,
G. Corradi,
C. Curceanu (Petrascu,
A. dʼUffizi,
C. Fiorini,
T. Frizzi, [......],
A. Scordo,
H. Shi,
D.L. Sirghi,
F. Sirghi,
H. Tatsuno,
A. Tudorache, V. Tudorache,
O. Vazquez Doce,
E. Wiedmann,
J. Zmeskal
[show abstract]
[hide abstract]
ABSTRACT: The SIDDHARTA experiment (SIlicon Drift Detector for Hadronic Atom Research by Timing Application) had the aim to perform a precise measurement of K-series kaonic hydrogen x-rays and the first-ever measurement of the kaonic deuterium x-rays to determine the strong-interaction energy-level shifts and widths of the lowest lying atomic states.These measurements offer a unique possibility to precisely determine the isospin-dependent kaon-nucleon(KN) scattering lengths which are directly connected with the physics of the KN interaction.The experiment combined the excellent low-energy kaon beam generated at DAΦNE, allowing to use gaseous targets, with excellent fast X-rays detectors: Silicon Drift Detectors. SIDDHARTA was installed on DAΦNE in autumn 2008 and took data till late 2009.Apart of the kaonic hydrogen and kaonic deuterium measurements, we have performed the kaonic helium transitions to the 2p level (L-lines) measurements: for the first time in a gaseous target for kaonic helium 4 and for the first time ever for kaonic helium 3. In this paper, an overview of this experiment and preliminary results are presented, together with future plans.
Nuclear Physics B - Proceedings Supplements · 0.88 Impact Factor
