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Evidence for Δ(2200)7/2− from photoproduction and consequence for chiral-symmetry restoration at high mass.

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Title: Evidence for Δ(2200)7/2− from photoproduction and consequence for chiral-symmetry restoration at high mass.
Authors: Anisovich, A.V.1,2, Burkert, V.3, Hartmann, J.1, Klempt, E.1 klempt@hiskp.uni-bonn.de, Nikonov, V.A.1,2, Pasyuk, E.3, Sarantsev, A.V.1,2, Strauch, S.4, Thoma, U.1
Source: Physics Letters B. Mar2017, Vol. 766, p357-361. 5p.
Subjects: Chirality, Symmetry (Physics), High mass stars, Polarization (Nuclear physics), Parity (Physics)
Abstract: We report a partial-wave analysis of new data on the double-polarization variable E for the reactions γ p → π + n and γ p → π 0 p and of further data published earlier. The analysis within the Bonn–Gatchina (BnGa) formalism reveals evidence for a poorly known baryon resonance, the one-star Δ ( 2200 ) 7 / 2 − . This is the lowest-mass Δ ⁎ resonance with spin-parity J P = 7 / 2 − . Its mass is significantly higher than the mass of its parity partner Δ ( 1950 ) 7 / 2 + which is the lowest-mass Δ ⁎ resonance with spin-parity J P = 7 / 2 + . It has been suggested that chiral symmetry might be restored in the high-mass region of hadron excitations, and that these two resonances should be degenerate in mass. Our findings are in conflict with this prediction. [ABSTRACT FROM AUTHOR]
Copyright of Physics Letters B is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
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  Data: Evidence for Δ(2200)7/2− from photoproduction and consequence for chiral-symmetry restoration at high mass.
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  Data: <searchLink fieldCode="JN" term="%22Physics+Letters+B%22">Physics Letters B</searchLink>. Mar2017, Vol. 766, p357-361. 5p.
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  Data: We report a partial-wave analysis of new data on the double-polarization variable E for the reactions γ p → π + n and γ p → π 0 p and of further data published earlier. The analysis within the Bonn–Gatchina (BnGa) formalism reveals evidence for a poorly known baryon resonance, the one-star Δ ( 2200 ) 7 / 2 − . This is the lowest-mass Δ ⁎ resonance with spin-parity J P = 7 / 2 − . Its mass is significantly higher than the mass of its parity partner Δ ( 1950 ) 7 / 2 + which is the lowest-mass Δ ⁎ resonance with spin-parity J P = 7 / 2 + . It has been suggested that chiral symmetry might be restored in the high-mass region of hadron excitations, and that these two resonances should be degenerate in mass. Our findings are in conflict with this prediction. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Physics Letters B is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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