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

(A2 Collaboration at MAMI)

doi:10.1103/PhysRevLett.124.132001

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

(A2 Collaboration at MAMI)

Racah Institute of Physics

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

13 Scopus citations

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	American 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

Bibliographical note

Funding Information:
We are indebted to M. Zurek for providing us data on analyzing powers. This work has been supported by the U.K. STFC (ST/L00478X/2, ST/P004385/2, ST/T002077/1, ST/L005824/1, 57071/1, 50727/1) grants, the Deutsche Forschungsgemeinschaft (SFB443, SFB/TR16, and SFB1044), DFG-RFBR (Grant No. 09-02-91330), Schweizerischer Nationalfonds (Contracts No. 200020-175807, No. 200020-156983, No. 132799, No. 121781, No. 117601), the U.S. Department of Energy (Offices of Science and Nuclear Physics, Awards No. DE-SC0014323, No. DEFG02-99-ER41110, No. DE-FG02-88ER40415, No. DEFG02-01-ER41194) and National Science Foundation (Grants No. NSF OISE-1358175; No. PHY-1039130, No. PHY-1714833, No. IIA-1358175), INFN (Italy), and NSERC of Canada (Grant No. FRN-SAPPJ2015-00023).

Publisher Copyright:
© 2020 authors. Published by the American Physical Society.

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10.1103/PhysRevLett.124.132001

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@article{1d7d9fa7d0d54f998768a4111dafcba7,

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 = "{(A2 Collaboration at MAMI)} and 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 = "Funding Information: We are indebted to M. Zurek for providing us data on analyzing powers. This work has been supported by the U.K. STFC (ST/L00478X/2, ST/P004385/2, ST/T002077/1, ST/L005824/1, 57071/1, 50727/1) grants, the Deutsche Forschungsgemeinschaft (SFB443, SFB/TR16, and SFB1044), DFG-RFBR (Grant No. 09-02-91330), Schweizerischer Nationalfonds (Contracts No. 200020-175807, No. 200020-156983, No. 132799, No. 121781, No. 117601), the U.S. Department of Energy (Offices of Science and Nuclear Physics, Awards No. DE-SC0014323, No. DEFG02-99-ER41110, No. DE-FG02-88ER40415, No. DEFG02-01-ER41194) and National Science Foundation (Grants No. NSF OISE-1358175; No. PHY-1039130, No. PHY-1714833, No. IIA-1358175), INFN (Italy), and NSERC of Canada (Grant No. FRN-SAPPJ2015-00023). Publisher Copyright: {\textcopyright} 2020 authors. Published by the American Physical Society.",

year = "2020",

month = apr,

day = "3",

doi = "10.1103/PhysRevLett.124.132001",

language = "American English",

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 - (A2 Collaboration at MAMI)

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.

N1 - Funding Information: We are indebted to M. Zurek for providing us data on analyzing powers. This work has been supported by the U.K. STFC (ST/L00478X/2, ST/P004385/2, ST/T002077/1, ST/L005824/1, 57071/1, 50727/1) grants, the Deutsche Forschungsgemeinschaft (SFB443, SFB/TR16, and SFB1044), DFG-RFBR (Grant No. 09-02-91330), Schweizerischer Nationalfonds (Contracts No. 200020-175807, No. 200020-156983, No. 132799, No. 121781, No. 117601), the U.S. Department of Energy (Offices of Science and Nuclear Physics, Awards No. DE-SC0014323, No. DEFG02-99-ER41110, No. DE-FG02-88ER40415, No. DEFG02-01-ER41194) and National Science Foundation (Grants No. NSF OISE-1358175; No. PHY-1039130, No. PHY-1714833, No. IIA-1358175), INFN (Italy), and NSERC of Canada (Grant No. FRN-SAPPJ2015-00023). Publisher Copyright: © 2020 authors. Published by the American Physical Society.

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 - Article

C2 - 32302204

AN - SCOPUS:85083908875

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 →)

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