Measurement of Invariant Mass Spectra of Vector Meson Decaying in Nuclear Matter at KEK-PS

2004 ◽  
Author(s):  
R. Muto
Keyword(s):  
Vector Meson ◽  
Nuclear Matter ◽  
Invariant Mass ◽  
Mass Spectra ◽  
Invariant Mass Spectra

Measurement of invariant mass spectra of vector meson decaying in nuclear matter

2003 ◽  
Vol 721 ◽  
pp. C297-C300 ◽  
Author(s):  
M. Naruki ◽  
J. Chiba ◽  
H. En'yo ◽  
H. Funahashi ◽  
H. Hamagaki ◽  
...  
Keyword(s):  
Vector Meson ◽  
Nuclear Matter ◽  
Invariant Mass ◽  
Mass Spectra ◽  
Invariant Mass Spectra

scholarly journals YN CORRELATIONS FROM THE STOPPED K− REACTION ON 4He

2008 ◽  
Vol 23 (27n30) ◽  
pp. 2520-2523 ◽  
Author(s):  
T. SUZUKI ◽  
M. IIO ◽  
K. ITAHASHI ◽  
M. IWASAKI ◽  
Y. MATSUDA ◽  
...  
Keyword(s):  
Invariant Mass ◽  
Mass Spectra ◽  
Absorption Process ◽  
Isospin Dependence ◽  
First Time ◽  
Invariant Mass Spectra

We have investigated non-mesonic reactions of the stopped K− on 4 He in terms of correlations of coincident ΛN pairs. As the result, Λp and Λn branches of the two-nucleon absorption process were clearly observed in the ΛN invariant mass spectra. The spin-isospin dependence of the process was observed for the first time.

scholarly journals Apparent and Actual Shifts in Mass and Width of ϕ Mesons Produced in Heavy-Ion Collisions

1997 ◽  
Vol 12 (02) ◽  
pp. 127-134 ◽  
Author(s):  
R. S. Bhalerao ◽  
S. K. Gupta
Keyword(s):  
Invariant Mass ◽  
Preliminary Data ◽  
Heavy Ion Collisions ◽  
Mass Spectra ◽  
Dense Matter ◽  
Heavy Ion ◽  
High Energy ◽  
Mass Shift ◽  
Ion Collisions ◽  
Invariant Mass Spectra

We present a method of analyzing invariant-mass spectra of kaon pairs resulting from decay of ϕ mesons produced in high-energy heavy-ion collisions. It can be used to extract the shifts in the mass and the width (ΔM and ΔΓ) of the ϕ mesons when they are inside the dense matter formed in these collisions. We illustrate our method with the help of available preliminary data. Extracted values of ΔM and ΔΓ are significantly larger than those obtained with an earlier method. Our results are consistent with the experimentally observed pT dependence of the mass shift. Finally, we present a phenomenological relation between ΔM and ΔΓ. It provides a useful constraint on theories which predict the values of these two quantities.

DIELECTRON SPECTROSCOPY IN COLD NUCLEAR MATTER

2011 ◽  
Vol 26 (03n04) ◽  
pp. 737-740 ◽  
Author(s):  
◽  
MICHAEL WEBER
Keyword(s):  
Vector Meson ◽  
Nuclear Matter ◽  
Invariant Mass ◽  
Meson Production ◽  
Yield Ratio ◽  
Vector Meson Production ◽  
Production Threshold ◽  
Light Vector Meson ◽  
Mass Distributions ◽  
Light Vector

We report recent data on e + e - pair emission in proton nucleus collisions at energies slightly above the light vector meson production threshold. Invariant mass distributions for the p + Nb system at Ekin = 3.5 GeV/c2 show a clear ρ/ω signal and are compared to data from elementary p + p reactions. We observe a constant π0/ω yield ratio for both systems.

The initial single chiral particle emission mechanism and its predictions of charmonium-like structures

2014 ◽  
Vol 29 ◽  
pp. 1460223
Author(s):  
Dian-Yong Chen
Keyword(s):  
Invariant Mass ◽  
Mass Spectra ◽  
Particle Emission ◽  
Emission Mechanism ◽  
Mass Distributions ◽  
Invariant Mass Spectra

We propose a new mechanism, named as the initial single chiral particle emission mechanism, to explain the charged Zb(10610) and Zb(10650) observed in the ϒ(5S) → π+π-ϒ(nS), π+π-hb(mP), (n = 1 ~ 3, m = 1, 2) processes. After successfully interpreting the charge Zb structures, we extend this mechanism to study the process of the dipion transitions between the higher charmonia/charmonium-like state and the lower charmonia. In these transitions process, we predict two charmonium analogs of the charged Zb. After the observations of Zc(3900) by the BESIII and the Belle Collaborations, we reproduce the dipion and the J/ψπ invariant mass distributions simultaneously with the initial single chiral particle emission mechanism. In addition, we predict some enhancements in the J/ψK invariant mass spectra in the dikaon decay of the higher charmonium and the charmonium like states.

STUDY OF IN-MEDIUM MESON MODIFICATION IN 12 GeV p + A REACTIONS

2007 ◽  
Vol 22 (02n03) ◽  
pp. 397-405 ◽  
Author(s):  
◽  
S. Yokkaichi ◽  
H. En'yo ◽  
M. Naruki ◽  
R. Muto ◽  
...  
Keyword(s):  
Nuclear Matter ◽  
Invariant Mass ◽  
Mass Spectra ◽  
Proton Synchrotron ◽  
Vector Mesons ◽  
Significant Excess ◽  
Cold Nuclear Matter ◽  
Spectral Modification ◽  
Low Mass ◽  
Target Data

Invariant mass spectra of low-mass vector mesons in the e+e- channel are measured in 12 GeV p + C and p + Cu reactions [Formula: see text] at the KEK Proton Synchrotron. Significant excess is observed at the low-mass side of ω meson peak over the known hadronic sources both in the C and Cu target data. Also below the ϕ meson peak, an excess is found in the Cu target data for slowly moving mesons whose βγ is less than 1.25. They can be interpreted as signatures of the spectral modification of vector mesons in cold nuclear matter.

A correlated background in invariant mass spectra of three-body systems

2000 ◽  
Vol 673 (1-4) ◽  
pp. 143-156 ◽  
Author(s):  
C. Forssén ◽  
B. Jonson ◽  
M.V. Zhukov
Keyword(s):  
Invariant Mass ◽  
Mass Spectra ◽  
Three Body ◽  
Invariant Mass Spectra

Nuclei as generators of quasireal photons: Testing an equivalent-photon method for calculating invariant-mass spectra

1974 ◽  
Vol 10 (5) ◽  
pp. 1561-1575 ◽  
Author(s):  
C. Carimalo ◽  
G. Cochard ◽  
P. Kessler ◽  
J. Parisi ◽  
B. Roehner
Keyword(s):  
Invariant Mass ◽  
Mass Spectra ◽  
Equivalent Photon ◽  
Invariant Mass Spectra

scholarly journals Factorization and resummation for dijet invariant mass spectra

2012 ◽  
Vol 85 (7) ◽  
Author(s):  
Christian W. Bauer ◽  
Frank J. Tackmann ◽  
Jonathan R. Walsh ◽  
Saba Zuberi
Keyword(s):  
Invariant Mass ◽  
Mass Spectra ◽  
Invariant Mass Spectra
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