Measurement of polarization-transfer to bound protons in carbon and its virtuality dependence

A1 Collaboration

doi:10.1016/j.physletb.2018.03.027

Measurement of polarization-transfer to bound protons in carbon and its virtuality dependence

A1 Collaboration

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

14 Scopus citations

Abstract

We measured the ratio P_x/P_z of the transverse to longitudinal components of polarization transferred from electrons to bound protons in C12 by the C12(e→,e^′p→) process at the Mainz Microtron (MAMI). We observed consistent deviations from unity of this ratio normalized to the free-proton ratio, (P_x/P_z)_C12/(P_x/P_z)_H1, for both s- and p-shell knocked out protons, even though they are embedded in averaged local densities that differ by about a factor of two. The dependence of the double ratio on proton virtuality is similar to the one for knocked out protons from H2 and He4, suggesting a universal behavior. It further implies no dependence on average local nuclear density.

Original language	English
Pages (from-to)	95-98
Number of pages	4
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	781
DOIs	https://doi.org/10.1016/j.physletb.2018.03.027
State	Published - 10 Jun 2018
Externally published	Yes

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1016/j.physletb.2018.03.027

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@article{2458e95c11fe4d5db296cf2a65d7b6d7,

title = "Measurement of polarization-transfer to bound protons in carbon and its virtuality dependence",

abstract = "We measured the ratio Px/Pz of the transverse to longitudinal components of polarization transferred from electrons to bound protons in C12 by the C12(e→,e′p→) process at the Mainz Microtron (MAMI). We observed consistent deviations from unity of this ratio normalized to the free-proton ratio, (Px/Pz)C12/(Px/Pz)H1, for both s- and p-shell knocked out protons, even though they are embedded in averaged local densities that differ by about a factor of two. The dependence of the double ratio on proton virtuality is similar to the one for knocked out protons from H2 and He4, suggesting a universal behavior. It further implies no dependence on average local nuclear density.",

author = "{A1 Collaboration} and D. Izraeli and T. Brecelj and P. Achenbach and A. Ashkenazi and R. B{\"o}hm and Cohen, {E. O.} and Distler, {M. O.} and A. Esser and R. Gilman and T. Kolar and I. Korover and J. Lichtenstadt and I. Mardor and H. Merkel and M. Mihovilovi{\v c} and U. M{\"u}ller and M. Olivenboim and E. Piasetzky and G. Ron and Schlimme, {B. S.} and M. Schoth and C. Sfienti and S. {\v S}irca and S. {\v S}tajner and S. Strauch and M. Thiel and A. Weber and I. Yaron",

note = "Publisher Copyright: {\textcopyright} 2018 The Author(s)",

year = "2018",

month = jun,

day = "10",

doi = "10.1016/j.physletb.2018.03.027",

language = "English",

volume = "781",

pages = "95--98",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Measurement of polarization-transfer to bound protons in carbon and its virtuality dependence

AU - A1 Collaboration

AU - Izraeli, D.

AU - Brecelj, T.

AU - Achenbach, P.

AU - Ashkenazi, A.

AU - Böhm, R.

AU - Cohen, E. O.

AU - Distler, M. O.

AU - Esser, A.

AU - Gilman, R.

AU - Kolar, T.

AU - Korover, I.

AU - Lichtenstadt, J.

AU - Mardor, I.

AU - Merkel, H.

AU - Mihovilovič, M.

AU - Müller, U.

AU - Olivenboim, M.

AU - Piasetzky, E.

AU - Ron, G.

AU - Schlimme, B. S.

AU - Schoth, M.

AU - Sfienti, C.

AU - Širca, S.

AU - Štajner, S.

AU - Strauch, S.

AU - Thiel, M.

AU - Weber, A.

AU - Yaron, I.

PY - 2018/6/10

Y1 - 2018/6/10

N2 - We measured the ratio Px/Pz of the transverse to longitudinal components of polarization transferred from electrons to bound protons in C12 by the C12(e→,e′p→) process at the Mainz Microtron (MAMI). We observed consistent deviations from unity of this ratio normalized to the free-proton ratio, (Px/Pz)C12/(Px/Pz)H1, for both s- and p-shell knocked out protons, even though they are embedded in averaged local densities that differ by about a factor of two. The dependence of the double ratio on proton virtuality is similar to the one for knocked out protons from H2 and He4, suggesting a universal behavior. It further implies no dependence on average local nuclear density.

AB - We measured the ratio Px/Pz of the transverse to longitudinal components of polarization transferred from electrons to bound protons in C12 by the C12(e→,e′p→) process at the Mainz Microtron (MAMI). We observed consistent deviations from unity of this ratio normalized to the free-proton ratio, (Px/Pz)C12/(Px/Pz)H1, for both s- and p-shell knocked out protons, even though they are embedded in averaged local densities that differ by about a factor of two. The dependence of the double ratio on proton virtuality is similar to the one for knocked out protons from H2 and He4, suggesting a universal behavior. It further implies no dependence on average local nuclear density.

UR - http://www.scopus.com/inward/record.url?scp=85044962391&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2018.03.027

DO - 10.1016/j.physletb.2018.03.027

M3 - Article

AN - SCOPUS:85044962391

SN - 0370-2693

VL - 781

SP - 95

EP - 98

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

ER -

Measurement of polarization-transfer to bound protons in carbon and its virtuality dependence

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