[Hallc] Close-out of PAC 41

[Erica Jones]

Greetings all,

This e-mail is to fill you in on the close-out of PAC 41, the special meeting to discuss the priority of already approved proposals for scheduling during the first 3-5 years of production running in the 12 GeV era. Specifically, the PAC was asked to identify a subset proposals that it considers to be "High Impact" for scheduling priority during this time frame. I list below the experiments that were identified as part of this "High Impact" group.

Please note that this is science guidance from the PAC, but not a scheduling mandate. Scheduling for experiments will be done as ever taking into account multiple technical and practical considerations from the users and the laboratory divisions. The PAC also stressed that they are looking forward to results from the full program of approved experiments.

In some cases, a subset of days within an experiment were viewed as High Impact. There was also some mention made of particularly difficult decisions. The latter are mentioned where applicable below in parentheses.

Bob McKeown will present the PAC 41 results in detail at the upcoming user meeting and there will be a report posted in time. We will look forward to discussing all of this with you also at the upcoming Hall A/C combined collaboration meeting!

Very best,
Thia and Steve

Exp#
Exp name or description
Hall

E12-06-102
GlueX: Mapping the Spectrum of Light Quark Mesons and Gluonic Excitations with Linearly Polarized Photons
D

E12-06-101
Measurement of the Charged Pion Form Factor to High Q2
C

E12-07-109
GEp/GMp: Large Acceptance Proton Form Factor Ratio Meas's at 13 and 15 (GeV/c)2 Using Recoil Polarization Method
A
(The proton was chosen, with much debate, over the neutron as the Q^2  reach was larger plus the zero crossing possibility.)

E12-11-106
High Precision Measurement of the Proton Charge Radius
B

E12-06-113
?BONuS: The Structure of the Free Neutron at Large x-Bjorken
B

E12-10-103
MARATHON: Measurement of the F2n/F2p, d/u Ratios and A=3 EMC Effect in Deep Inelastic Scattering off the Tritium and Helium Mirror Nuclei
A


E12-06-110
?A1n HallC--3He: Meas of Neutron Spin Asymmetry A1n in the Valence Quark Region Using an 11 GeV Beam and a Polarized 3He Target in Hall C
C

C12-11-111
TMD CLAS--HDIce: SIDIS on Transverse polarized target
B

C12-12-009
Dihadron CLAS-HDIce: Measurement of transversity with dihadron production in SIDIS with transversely polarized target
B

E12-06-112
?TMD CLAS-H(Unpol): Probing the Proton's Quark Dynamics in Semi-Inclusive Pion Production at 12 GeV
B

E12-06-114
?DVCS HallA--H(UU,LU): Measurements of Electron-Helicity Dependent Cross Sections of DVCS with CEBAF at 12 GeV
A

C12-12-010
DVCS CLAS--HDIce: DVCS at 11 GeV with transversely polarized target using the CLAS12 Detector
B

E12-11-003
?DVCS CLAS--D(UU,LU): DVCS on the Neutron with CLAS12 at 11 GeV
B
(This is on the list to be considered as a backup if HDIce delayed.)

(The Hall C exclusive pion L/T was also much discussed as critical to the overall DVCS/GPD program.)

E12-13-005
Bubble Chamber: Measurement of 16O(3,±)12C with a bubblechamber and a bremsstrahlung beam
INJ

E12-11-101
?PREx-II: Precision Parity-Violating Measurement of the Neutron Skin of Lead
A
(Here, the PAC noted that CREX was also both needed and complementary to PREX-II, while PREX-II had more direct impact for astrophysics.)

E12-06-105
SRC--hiX: Inclusive Scattering from Nuclei at $x > 1$ in the quasielastic and deeply inelastic regimes
C

E12-11-112
?SRC--Tritium: Precision measurement of the isospin dependence in the 2N and 3N short range correlation region
A

E12-11-006
?HPS : Status of the Heavy Photon Search Experiment at Jefferson Laboratory (Update on PR12_11_006)
B
(The pre-engineering run + 14 physics days at 4.4 GeV were viewed as High Impact.)

E12-10-009
APEX : Search for new Vector Boson A1 Decaying to e+e-
A

-- 
Erica Jones
Hall C Admin. & Polarized Target
Jefferson Laboratory
12000 Jefferson Avenue, Ste. 6
Newport News, VA  23606
Phone:	(757) 269-5699
Fax:	(757) 269-5235
Email:	eljones at jlab.org

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