Signatures of the $d^*(2380)$ hexaquark in d($γ$,$p\vec{n}$)

A2 Collaboration at MAMI; Stuart Fegan; A. Fix; C. Mullen; A. Neganov; A. Neiser; M. Ostrick; P. B. Otte; D. Paudyal; P. Pedroni; A Powell; S. N. Prakhov; G. Ron; A Sarty; C. Sfienti; V. Sokhoyan; K. Spieker; O Steffen; I.I. Strakovsky; T. Strub; I Supek; A. Thiel; M Thiel; A. Thomas; Yu A. Usov; S Wagner; N.K. Walford; Dominik Werthmüller; J.  Wettig; M. Wolfes; Nick Zachariou; L A Zana

doi:10.1103/PhysRevLett.124.132001

Signatures of the $d^*(2380)$ hexaquark in d($γ$,$p\vec{n}$)

A2 Collaboration at MAMI, Stuart Fegan, A. Fix, C. Mullen, A. Neganov, A. Neiser, M. Ostrick, P. B. Otte, D. Paudyal, P. Pedroni, A Powell, S. N. Prakhov, G. Ron, A Sarty, C. Sfienti, V. Sokhoyan, K. Spieker, O Steffen, I.I. Strakovsky, T. StrubI Supek, A. Thiel, M Thiel, A. Thomas, Yu A. Usov, S Wagner, N.K. Walford, Dominik Werthmüller, J. Wettig, M. Wolfes, Nick Zachariou, L A Zana

Physics

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

Abstract

We report a measurement of the spin polarisation of the recoiling neutron in deuterium photodisintegration, utilising 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 polarisation 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 polarisation in a narrow structure centred around $E_{\gamma}\sim$~570~MeV is observed, which is inconsistent with current theoretical predictions employing nucleon resonance degrees of freedom. A Legendre polynomial decomposition suggests this behaviour could be related to the excitation of the $d^*(2380)$ hexaquark.

Original language	English
Article number	132001
Pages (from-to)	1-6
Number of pages	6
Journal	Physical Review Letters
Volume	124
DOIs	https://doi.org/10.1103/PhysRevLett.124.132001
Publication status	Published - 31 Mar 2020

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10.1103/PhysRevLett.124.132001

PhysRevLett.124.132001
© 2020, The Author(s).
Final published version, 494 KBLicence: CC BY

Mikhail Bashkanov
- mikhail.bashkanovyork.acuk
- Physics - Lecturer
Person: Academic

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A2 Collaboration at MAMI, Fegan, S., Fix, A., Mullen, C., Neganov, A., Neiser, A., Ostrick, M., Otte, P. B., Paudyal, D., Pedroni, P., Powell, A., Prakhov, S. N., Ron, G., Sarty, A., Sfienti, C., Sokhoyan, V., Spieker, K., Steffen, O., Strakovsky, I. I., ... Zana, L. A. (2020). Signatures of the $d^*(2380)$ hexaquark in d($γ$,$p\vec{n}$). Physical Review Letters, 124, 1-6. Article 132001. https://doi.org/10.1103/PhysRevLett.124.132001

@article{beeb1b82749841cd8da8c4f61baff85a,

title = "Signatures of the $d^*(2380)$ hexaquark in d($γ$,$p\vec{n}$)",

abstract = " We report a measurement of the spin polarisation of the recoiling neutron in deuterium photodisintegration, utilising 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 polarisation 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 polarisation in a narrow structure centred around $E_{\gamma}\sim$~570~MeV is observed, which is inconsistent with current theoretical predictions employing nucleon resonance degrees of freedom. A Legendre polynomial decomposition suggests this behaviour could be related to the excitation of the $d^*(2380)$ hexaquark. ",

keywords = "nucl-ex",

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 Stuart 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 M. Ostrick and Otte, {P. B.} and D. Paudyal and P. Pedroni and A Powell and Prakhov, {S. N.} and G. Ron and A Sarty and C. Sfienti and V. Sokhoyan and K. Spieker and O Steffen and I.I. Strakovsky and T. Strub and I Supek and A. Thiel and M Thiel and A. Thomas and Usov, {Yu A.} and S Wagner and N.K. Walford and Dominik Werthm{\"u}ller and J. Wettig and M. Wolfes and Nick Zachariou and Zana, {L A}",

note = "{\textcopyright} 2020, The Author(s). ",

year = "2020",

month = mar,

day = "31",

doi = "10.1103/PhysRevLett.124.132001",

language = "English",

volume = "124",

pages = "1--6",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

}

A2 Collaboration at MAMI, Fegan, S, Fix, A, Mullen, C, Neganov, A, Neiser, A, Ostrick, M, Otte, PB, Paudyal, D, Pedroni, P, Powell, A, Prakhov, SN, Ron, G, Sarty, A, Sfienti, C, Sokhoyan, V, Spieker, K, Steffen, O, Strakovsky, II, Strub, T, Supek, I, Thiel, A, Thiel, M, Thomas, A, Usov, YA, Wagner, S, Walford, NK, Werthmüller, D, Wettig, J, Wolfes, M, Zachariou, N & Zana, LA 2020, 'Signatures of the $d^*(2380)$ hexaquark in d($γ$,$p\vec{n}$)', Physical Review Letters, vol. 124, 132001, pp. 1-6. https://doi.org/10.1103/PhysRevLett.124.132001

TY - JOUR

T1 - Signatures of the $d^*(2380)$ hexaquark in d($γ$,$p\vec{n}$)

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, Stuart

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 - Ostrick, M.

AU - Otte, P. B.

AU - Paudyal, D.

AU - Pedroni, P.

AU - Powell, A

AU - Prakhov, S. N.

AU - Ron, G.

AU - Sarty, A

AU - Sfienti, C.

AU - Sokhoyan, V.

AU - Spieker, K.

AU - Steffen, O

AU - Strakovsky, I.I.

AU - Strub, T.

AU - Supek, I

AU - Thiel, A.

AU - Thiel, M

AU - Thomas, A.

AU - Usov, Yu A.

AU - Wagner, S

AU - Walford, N.K.

AU - Werthmüller, Dominik

AU - Wettig, J.

AU - Wolfes, M.

AU - Zachariou, Nick

AU - Zana, L A

PY - 2020/3/31

Y1 - 2020/3/31

N2 - We report a measurement of the spin polarisation of the recoiling neutron in deuterium photodisintegration, utilising 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 polarisation 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 polarisation in a narrow structure centred around $E_{\gamma}\sim$~570~MeV is observed, which is inconsistent with current theoretical predictions employing nucleon resonance degrees of freedom. A Legendre polynomial decomposition suggests this behaviour could be related to the excitation of the $d^*(2380)$ hexaquark.

AB - We report a measurement of the spin polarisation of the recoiling neutron in deuterium photodisintegration, utilising 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 polarisation 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 polarisation in a narrow structure centred around $E_{\gamma}\sim$~570~MeV is observed, which is inconsistent with current theoretical predictions employing nucleon resonance degrees of freedom. A Legendre polynomial decomposition suggests this behaviour could be related to the excitation of the $d^*(2380)$ hexaquark.

KW - nucl-ex

U2 - 10.1103/PhysRevLett.124.132001

DO - 10.1103/PhysRevLett.124.132001

M3 - Letter

SN - 0031-9007

VL - 124

SP - 1

EP - 6

JO - Physical Review Letters

JF - Physical Review Letters

M1 - 132001

ER -

Signatures of the $d^*(2380)$ hexaquark in d($γ$,$p\vec{n}$)

Abstract

Bibliographical note

Keywords

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Mikhail Bashkanov

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