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Title: Pole position of the a 1 ( 1260 ) from τ -decay

Abstract

We perform an analysis of the three-pion system with quantum numbers JPC = 1++ produced in the weak decay of tau leptons. The interaction is known to be dominated by the axial meson a1(1260). Here, we build a model based on approximate three-body unitary and fix the free parameters by fitting it to the ALEPH data on τ- → π- π+- π- ντ decay. We then perform the analytic continuation of the amplitude to the complex energy plane. The singularity structures related to the ππ subchannel resonances are carefully addressed. Finally, we extract the a1(1260) pole position m$$a_1(1260))\atop{p}$$-iΓ$$a_1(1260))\atop{p}$$/2 with m$$a_1(1260))\atop{p}$$ = (1209 ± 4 $$+12\atop{-9}$$) MeV, Γ $$a_1(1260))\atop{p}$$ = (576 ± 11 $$+80\atop{-20}$$) MeV.

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Contributing Org.:
Joint Physics Analysis Center Collaboration
OSTI Identifier:
1483739
Alternate Identifier(s):
OSTI ID: 1484176
Report Number(s):
JLAB-THY-18-2816; DOE/OR/-23177-4552; arXiv:1810.00016
Journal ID: ISSN 2470-0010; PRVDAQ; 096021
Grant/Contract Number:  
AC05-06OR23177; FG02-87ER40365; IA101717; IA101819; 251817; PHY-1415459; FPA2016-77313-P; FPA2016-75654-C2-2-P
Resource Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Name: Physical Review D Journal Volume: 98 Journal Issue: 9; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Mikhasenko, M., Pilloni, A., Jackura, A., Albaladejo, M., Fernández-Ramírez, C., Mathieu, V., Nys, J., Rodas, A., Ketzer, B., Szczepaniak, A. P., and Joint Physics Analysis Center Collaboration. Pole position of the a 1 ( 1260 ) from τ -decay. United States: N. p., 2018. Web. doi:10.1103/PhysRevD.98.096021.
Mikhasenko, M., Pilloni, A., Jackura, A., Albaladejo, M., Fernández-Ramírez, C., Mathieu, V., Nys, J., Rodas, A., Ketzer, B., Szczepaniak, A. P., & Joint Physics Analysis Center Collaboration. Pole position of the a 1 ( 1260 ) from τ -decay. United States. doi:https://doi.org/10.1103/PhysRevD.98.096021
Mikhasenko, M., Pilloni, A., Jackura, A., Albaladejo, M., Fernández-Ramírez, C., Mathieu, V., Nys, J., Rodas, A., Ketzer, B., Szczepaniak, A. P., and Joint Physics Analysis Center Collaboration. Wed . "Pole position of the a 1 ( 1260 ) from τ -decay". United States. doi:https://doi.org/10.1103/PhysRevD.98.096021.
@article{osti_1483739,
title = {Pole position of the a 1 ( 1260 ) from τ -decay},
author = {Mikhasenko, M. and Pilloni, A. and Jackura, A. and Albaladejo, M. and Fernández-Ramírez, C. and Mathieu, V. and Nys, J. and Rodas, A. and Ketzer, B. and Szczepaniak, A. P. and Joint Physics Analysis Center Collaboration},
abstractNote = {We perform an analysis of the three-pion system with quantum numbers JPC = 1++ produced in the weak decay of tau leptons. The interaction is known to be dominated by the axial meson a1(1260). Here, we build a model based on approximate three-body unitary and fix the free parameters by fitting it to the ALEPH data on τ- → π- π+- π- ντ decay. We then perform the analytic continuation of the amplitude to the complex energy plane. The singularity structures related to the ππ subchannel resonances are carefully addressed. Finally, we extract the a1(1260) pole position m$a_1(1260))\atop{p}$-iΓ$a_1(1260))\atop{p}$/2 with m$a_1(1260))\atop{p}$ = (1209 ± 4 $+12\atop{-9}$) MeV, Γ $a_1(1260))\atop{p}$ = (576 ± 11 $+80\atop{-20}$) MeV.},
doi = {10.1103/PhysRevD.98.096021},
journal = {Physical Review D},
number = 9,
volume = 98,
place = {United States},
year = {2018},
month = {11}
}

Journal Article:
Free Publicly Available Full Text
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DOI: https://doi.org/10.1103/PhysRevD.98.096021

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Cited by: 4 works
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