From GlueX/CLAS12 to the EIC

From GlueX/CLAS12 to the EICJustin Stevens

Justin Stevens,Snowmass Spectroscopy

exoticspositive paritynegative parity

2

Dudek et al. PRD 88 (2013) 094505

Lightest hybrid mesons

JPC

Mes

on M

ass

(MeV

)Lattice QCD

qq

g


exoticspositive paritynegative parity

3

Dudek et al. PRD 88 (2013) 094505

JPC

Mes

on M

ass

(MeV

)Lattice QCD

qq

g

exotics

JPC

ssuu+ ddisovector

Most experimental searches for hybrids

limited to the π1 state

Lightest hybrid mesons


: coupled channel fit to ηπ and η’π determine pole positions for a2, a2’, and exotic π1

4

COMPASS: Phys. Lett. B 740, 303 (2015).JPAC: Phys. Rev. Lett. 122, 042002 (2019).

ηπ/η’π spectroscopy at with

COMPASS: PLB 740 (2015) 303 JPAC: PRL 122 (2019) 042002

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a02(1700)<latexit sha1_base64="gxTogHt/dseoNI2p25627GiI2JI=">AAAB8XicdVDLSgMxFM34rPVVdekmWMS6GTLT0tZd0Y3LCvaB7VAyaaYNzWSGJCOUoX/hxoUibv0bd/6NmbaCih64cDjnXu69x485UxqhD2tldW19YzO3ld/e2d3bLxwctlWUSEJbJOKR7PpYUc4EbWmmOe3GkuLQ57TjT64yv3NPpWKRuNXTmHohHgkWMIK1ke7w2cAtOTWEzgeFIrIv6lW3UoXIRqjmuE5G3FqlXIGOUTIUwRLNQeG9P4xIElKhCcdK9RwUay/FUjPC6SzfTxSNMZngEe0ZKnBIlZfOL57BU6MMYRBJU0LDufp9IsWhUtPQN50h1mP128vEv7xeooO6lzIRJ5oKslgUJBzqCGbvwyGTlGg+NQQTycytkIyxxESbkPImhK9P4f+k7dpO2XZvKsXG5TKOHDgGJ6AEHFADDXANmqAFCBDgATyBZ0tZj9aL9bpoXbGWM0fgB6y3Tz08j1Y=</latexit>

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2++

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Justin Stevens,Snowmass Spectroscopy 5

Jefferson Lab 12 GeV e- beamRunning since 2017: programs in spectroscopy, nucleon structure, etc.

Photoproduction process provides access to many proposed exotic decay channels

Orders of magnitude higher statistics than previous photoproduction experiments

Kaon identification to investigate light vs strange quark content


ηπ/η’π spectroscopy at

6

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a0 a2

Investigating similar channel as exotic P-wave signals reported by COMPASS

Polarized photon beam provides new information on production mechanism, collaborating with JPAC on amplitudes


Pentaquarks and threshold charmonium

7

Threshold J/ψ production

�p ! pe+e�

PRL 123, 072001 (2019)



PRL 122, 222001 (2019)



8 9 10 20, GeV γE

1−10

1

10

p), n

bψ

J/

→p γ(

σ

GlueXSLACCornell

BR=2.9%-(4312) 3/2+cJPAC P

BR=1.6%-(4440) 3/2+cJPAC P

BR=2.7%-(4457) 3/2+cJPAC P

Limits BR(Pc→J/ψp) < 2-4%, providing additional model constraints


PRL 123, 072001 (2019)

PRL 122, 222001 (2019)



Multiple complementary measurements at JLab will continue to improve limits

10

PRL 122, 222001 (2019)

8 8.5 9 9.5 10 10.5 11 11.5 12, GeV γE

1−10

1

p), n

bψ

J/→

p γ(σ

GlueX publishedBrodsky et al. fit to GlueX dataGlueX anticipated stat. errors

GlueX Phase I: Existing Data



Electron Ion Collider (EIC)

11

Versatile high-luminosity, polarized e+p and e+A collider, recently received DOE CD0

Construction could begin in a few years with first data in ~2030(?)

Very active development of detector conceptual designs (EIC Yellow Report)

ps = 20� 141 GeV

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L = 1034 cm�2s�1

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Exotic Photoproduction @ EIC

Higher energy provides opportunities in XYZ, Pc, etc.

EIC Yellow Report: developing detector requirements for spectroscopy (PID, recoil nucleons, etc.)

Polarized electron and ion beams

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PRD 88 (2013) 114009

Z+c (3900) Vector meson

exchange couple to and X(3872)→J/ψρ

u-channel exchange of Pc results into “backward” J/ψ

Model development by JPAC: Szczepaniak, Pilloni, Hiller Blin,

Winney, Albaladejo, Mathieu

BESIIIPRL 110, 252001 (2013)


Exotic Photoproduction @ EIC

Higher energy provides opportunities in XYZ, Pc, etc.

EIC Yellow Report: developing detector requirements for spectroscopy (PID, recoil nucleons, etc.)

Polarized electron and ion beams

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Many groups participating: JPAC, JLab, Florida State, Indiana, W&M, Glasgow, INFN, Regina. More welcome!

EIC Yellow Report: detector requirements for spectroscopy (PID, recoil nucleon tagging, etc.)

3.6 3.8 4 4.2 4.4 (GeV)πψJ/ M

0

1000

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80005 x 41

HandbookπNo e/

3.6 3.8 4 4.2 4.4 (GeV)πψJ/ M

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5 x 41Handbook

π e/σ1

3.6 3.8 4 4.2 4.4 (GeV)πψJ/ M

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π e/σ2

3.6 3.8 4 4.2 4.4 (GeV)πψJ/ M

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π e/σ3

Pythia Zc→J/ψπ+

http://www.eicug.org/web/content/yellow-report-initiative


Summary and OutlookFixed target spectroscopy focused on light quark hybrids and threshold J/ψ production (s-channel Pc)

Jefferson Lab has a decade-long spectroscopy program with GlueX and CLAS12

EIC Spectroscopy program focused on alternative production mechanisms for heavy quark exotics

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8 9 10 20, GeV γE

1−10

1

10

p), n

bψ

J/

→p γ(

σ

GlueXSLACCornell

BR=2.9%-(4312) 3/2+cJPAC P

BR=1.6%-(4440) 3/2+cJPAC P

BR=2.7%-(4457) 3/2+cJPAC P

PRL 123, 072001 (2019)

From GlueX/CLAS12 to the EIC

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