Signatures of the d∗ (2380) Hexaquark in d (γ,p n →)

doi:10.1103/PhysRevLett.124.132001

Signatures of the d∗ (2380) Hexaquark in d (γ,p n →)

Racah Institute of Physics

Research output: Contribution to journal › Article › peer-review

Abstract

We report a measurement of the spin polarization of the recoiling neutron in deuterium photodisintegration, utilizing a new large acceptance polarimeter within the Crystal Ball at MAMI. The measured photon energy range of 300-700 MeV provides the first measurement of recoil neutron polarization at photon energies where the quark substructure of the deuteron plays a role, thereby providing important new constraints on photodisintegration mechanisms. A very high neutron polarization in a narrow structure centered around Eγ∼570 MeV is observed, which is inconsistent with current theoretical predictions employing nucleon resonance degrees of freedom. A Legendre polynomial decomposition suggests this behavior could be related to the excitation of the d∗(2380) hexaquark.

Original language	English
Article number	132001
Journal	Physical Review Letters
Volume	124
Issue number	13
DOIs	https://doi.org/10.1103/PhysRevLett.124.132001
State	Published - 3 Apr 2020

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

Access to Document

10.1103/PhysRevLett.124.132001

Cite this

@article{56ff48d113d740d190e8afe168507f5d,

title = "Signatures of the d∗ (2380) Hexaquark in d (γ,p n →)",

abstract = "We report a measurement of the spin polarization of the recoiling neutron in deuterium photodisintegration, utilizing a new large acceptance polarimeter within the Crystal Ball at MAMI. The measured photon energy range of 300-700 MeV provides the first measurement of recoil neutron polarization at photon energies where the quark substructure of the deuteron plays a role, thereby providing important new constraints on photodisintegration mechanisms. A very high neutron polarization in a narrow structure centered around Eγ∼570 MeV is observed, which is inconsistent with current theoretical predictions employing nucleon resonance degrees of freedom. A Legendre polynomial decomposition suggests this behavior could be related to the excitation of the d∗(2380) hexaquark.",

author = "M. Bashkanov and Watts, \{D. P.\} and Kay, \{S. J.D.\} and S. Abt and P. Achenbach and P. Adlarson and F. Afzal and Z. Ahmed and Akondi, \{C. S.\} and Annand, \{J. R.M.\} and Arends, \{H. J.\} and R. Beck and M. Biroth and N. Borisov and A. Braghieri and Briscoe, \{W. J.\} and F. Cividini and C. Collicott and S. Costanza and A. Denig and Downie, \{E. J.\} and P. Drexler and S. Fegan and A. Fix and S. Gardner and D. Ghosal and Glazier, \{D. I.\} and I. Gorodnov and W. Gradl and M. G{\"u}nther and D. Gurevich and L. Heijkenskj{\"o}ld and D. Hornidge and Huber, \{G. M.\} and A. K{\"a}ser and Kashevarov, \{V. L.\} and M. Korolija and B. Krusche and A. Lazarev and K. Livingston and S. Lutterer and MacGregor, \{I. J.D.\} and Manley, \{D. M.\} and Martel, \{P. P.\} and R. Miskimen and E. Mornacchi and C. Mullen and A. Neganov and A. Neiser and G. Ron",

note = "Publisher Copyright: {\textcopyright} 2020 authors. Published by the American Physical Society.",

year = "2020",

month = apr,

day = "3",

doi = "10.1103/PhysRevLett.124.132001",

language = "الإنجليزيّة",

volume = "124",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "13",

}

TY - JOUR

T1 - Signatures of the d∗ (2380) Hexaquark in d (γ,p n →)

AU - Bashkanov, M.

AU - Watts, D. P.

AU - Kay, S. J.D.

AU - Abt, S.

AU - Achenbach, P.

AU - Adlarson, P.

AU - Afzal, F.

AU - Ahmed, Z.

AU - Akondi, C. S.

AU - Annand, J. R.M.

AU - Arends, H. J.

AU - Beck, R.

AU - Biroth, M.

AU - Borisov, N.

AU - Braghieri, A.

AU - Briscoe, W. J.

AU - Cividini, F.

AU - Collicott, C.

AU - Costanza, S.

AU - Denig, A.

AU - Downie, E. J.

AU - Drexler, P.

AU - Fegan, S.

AU - Fix, A.

AU - Gardner, S.

AU - Ghosal, D.

AU - Glazier, D. I.

AU - Gorodnov, I.

AU - Gradl, W.

AU - Günther, M.

AU - Gurevich, D.

AU - Heijkenskjöld, L.

AU - Hornidge, D.

AU - Huber, G. M.

AU - Käser, A.

AU - Kashevarov, V. L.

AU - Korolija, M.

AU - Krusche, B.

AU - Lazarev, A.

AU - Livingston, K.

AU - Lutterer, S.

AU - MacGregor, I. J.D.

AU - Manley, D. M.

AU - Martel, P. P.

AU - Miskimen, R.

AU - Mornacchi, E.

AU - Mullen, C.

AU - Neganov, A.

AU - Neiser, A.

AU - Ron, G.

PY - 2020/4/3

Y1 - 2020/4/3

N2 - We report a measurement of the spin polarization of the recoiling neutron in deuterium photodisintegration, utilizing a new large acceptance polarimeter within the Crystal Ball at MAMI. The measured photon energy range of 300-700 MeV provides the first measurement of recoil neutron polarization at photon energies where the quark substructure of the deuteron plays a role, thereby providing important new constraints on photodisintegration mechanisms. A very high neutron polarization in a narrow structure centered around Eγ∼570 MeV is observed, which is inconsistent with current theoretical predictions employing nucleon resonance degrees of freedom. A Legendre polynomial decomposition suggests this behavior could be related to the excitation of the d∗(2380) hexaquark.

AB - We report a measurement of the spin polarization of the recoiling neutron in deuterium photodisintegration, utilizing a new large acceptance polarimeter within the Crystal Ball at MAMI. The measured photon energy range of 300-700 MeV provides the first measurement of recoil neutron polarization at photon energies where the quark substructure of the deuteron plays a role, thereby providing important new constraints on photodisintegration mechanisms. A very high neutron polarization in a narrow structure centered around Eγ∼570 MeV is observed, which is inconsistent with current theoretical predictions employing nucleon resonance degrees of freedom. A Legendre polynomial decomposition suggests this behavior could be related to the excitation of the d∗(2380) hexaquark.

UR - http://www.scopus.com/inward/record.url?scp=85083908875&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.124.132001

DO - 10.1103/PhysRevLett.124.132001

M3 - مقالة

C2 - 32302204

SN - 0031-9007

VL - 124

JO - Physical Review Letters

JF - Physical Review Letters

IS - 13

M1 - 132001

ER -

Signatures of the d∗ (2380) Hexaquark in d (γ,p n →)

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this