scholarly journals Measurement of the charged pion mass using X-ray spectroscopy of exotic atoms

2016 ◽  
Vol 759 ◽  
pp. 583-588 ◽  
Author(s):  
M. Trassinelli ◽  
D.F. Anagnostopoulos ◽  
G. Borchert ◽  
A. Dax ◽  
J.-P. Egger ◽  
...  
Keyword(s):  
Charged Pion ◽  
Pion Mass ◽  
Exotic Atoms ◽  
X Ray

Charged Pion Mass Determination and Energy — Calibration Standards Based on Pionic X-ray Transitions

2001 ◽  
pp. 500-507
Author(s):  
D. F. Anagnostopoulos ◽  
M. Augsburger ◽  
G. Borchert ◽  
D. Chatellard ◽  
P. El-Khoury ◽  
...  
Keyword(s):  
Charged Pion ◽  
Pion Mass ◽  
Energy Calibration ◽  
Mass Determination ◽  
Calibration Standards ◽  
X Ray

scholarly journals Mass determination of the charged pion, using high precision X-ray spectroscopy

2020 ◽  
Vol 9 ◽  
pp. 308
Author(s):  
D. F. Anagnostopoulos, et al.
Keyword(s):  
Electronic Transition ◽  
Transition Energy ◽  
Charged Pion ◽  
Pion Mass ◽  
Mass Determination ◽  
Crystal Spectrometer ◽  
X Ray ◽  
Line Shapes ◽  
A Value

X-ray transitions in pionic nitrogen were measured using a curved crystal spectrometer. From the transition energy, calibrated with the help of the copper Ka1,2 electronic transition, a value for the charged pion mass of (139.57071± 0.00053) MeV/c2 was deduced. In order to reduce the uncertainty of the charged pion mass in the level of 1 ppm, we propose the determination of pionic transition energy based on the more precisely known energies and line shapes of muonic transitions.

Precision Measurement of the Charged Pion Mass by High Resolution X-Ray Spectroscopy

2001 ◽  
pp. 195-207
Author(s):  
G. L. Borchert ◽  
B. Manil ◽  
D. Anagnostopoulos ◽  
J. P. Egger ◽  
D. Gotta ◽  
...  
Keyword(s):  
High Resolution ◽  
Precision Measurement ◽  
Charged Pion ◽  
Pion Mass ◽  
X Ray

scholarly journals Monopole and instanton effects in QCD

2020 ◽  
Vol 2020 (9) ◽  
Author(s):  
Masayasu Hasegawa
Keyword(s):  
Dirac Operator ◽  
Matrix Theory ◽  
Charged Pion ◽  
Lattice Gauge Theory ◽  
Pion Mass ◽  
Magnetic Monopoles ◽  
Chiral Condensate ◽  
Creation Operator ◽  
Experimental Result ◽  
Qcd Vacuum

Abstract We aim to show the effects of the magnetic monopoles and instantons in quantum chromodynamics (QCD) on observables; therefore, we introduce a monopole and anti-monopole pair in the QCD vacuum of a quenched SU(3) by applying the monopole creation operator to the vacuum. We calculate the eigenvalues and eigenvectors of the overlap Dirac operator that preserves the exact chiral symmetry in lattice gauge theory using these QCD vacua. We then investigate the effects of magnetic monopoles and instantons. First, we confirm the monopole effects as follows: (i) the monopole creation operator makes the monopoles and anti-monopoles in the QCD vacuum. (ii) A monopole and anti-monopole pair creates an instanton or anti-instanton without changing the structure of the QCD vacuum. (iii) The monopole and anti-monopole pairs change only the scale of the spectrum distribution without affecting the spectra of the Dirac operator by comparing the spectra with random matrix theory. Next, we find the instanton effects by increasing the number density of the instantons and anti-instantons as follows: (iv) the decay constants of the pseudoscalar increase. (v) The values of the chiral condensate, which are defined as negative numbers, decrease. (vi) The light quarks and the pseudoscalar mesons become heavy. The catalytic effect on the charged pion is estimated using the numerical results of the pion decay constant and the pion mass. (vii) The decay width of the charged pion becomes wider than the experimental result, and the lifetime of the charged pion becomes shorter than the experimental result. These are the effects of the monopoles and instantons in QCD.

A Novel Antimatter Detector Based on X‐Ray Deexcitation of Exotic Atoms

2002 ◽  
Vol 566 (1) ◽  
pp. 604-616 ◽  
Author(s):  
Kaya Mori ◽  
Charles J. Hailey ◽  
Edward A. Baltz ◽  
William W. Craig ◽  
Marc Kamionkowski ◽  
...  
Keyword(s):  
Exotic Atoms ◽  
X Ray

X-ray spectroscopy of exotic atoms

1990 ◽  
Author(s):  
K. Nagamine
Keyword(s):  
Exotic Atoms ◽  
X Ray

Precision determination of pion mass using X-ray CCD spectroscopy

2002 ◽  
Vol 477 (1-3) ◽  
pp. 461-468 ◽  
Author(s):  
N Nelms ◽  
D.F Anagnostopoulos ◽  
M Augsburger ◽  
G Borchert ◽  
D Chatellard ◽  
...  
Keyword(s):  
Pion Mass ◽  
X Ray ◽  
Precision Determination

scholarly journals Measurement of the charged pion mass using a low-density target of light atoms

2016 ◽  
Vol 130 ◽  
pp. 01022 ◽  
Author(s):  
M. Trassinelli ◽  
D.F. Anagnostopoulos ◽  
G. Borchert ◽  
A. Dax ◽  
J.-P. Egger ◽  
...  
Keyword(s):  
Charged Pion ◽  
Pion Mass ◽  
Low Density ◽  
Light Atoms

scholarly journals Laser Spectroscopy Measurements of Metastable Pionic Helium Atoms at Paul Scherrer Institute

2021 ◽  
Vol 62 (3) ◽  
Author(s):  
M. Hori ◽  
H. Aghai-Khozani ◽  
A. Sótér ◽  
A. Dax ◽  
D. Barna
Keyword(s):  
Laser Spectroscopy ◽  
Charged Pion ◽  
Pion Mass ◽  
Precise Determination ◽  
Paul Scherrer Institute ◽  
Antiprotonic Helium ◽  
Helium Atoms ◽  
Three Body ◽  
Paul Scherrer

AbstractWe review recent experiments carried out by the PiHe collaboration of the Paul Scherrer Institute (PSI) that observed an infrared transition of three-body pionic helium atoms by laser spectroscopy. These measurements may lead to a precise determination of the charged pion mass, and complement experiments of antiprotonic helium atoms carried out at the new ELENA facility of CERN.

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