Document Type
Report
Publication Date
2022
Pages
C12-21-004 (43 pp.)
Abstract
We propose to measure precision ratios of charged pion electroproduction in 10.6 GeV Semi-Inclusive Deep Inelastic Scattering from ²D, ³He and ³H targets in CLAS12 over a wide range of xB to test the flavor dependence of the EMC effect in the valence quark region. This trio of targets minimizes hadron attenuation effects while maximizing nuclear asymmetry and takes advantage of the tritium target that will be developed for the approved quasi-elastic experiment E12-20-005 [1]. The experiment will focus on z = En/v ≥ 0.3 to maximize the connection between the struck quark and the detected π±. Double ratios of the total yields and ratios of the yield differences between A = 3 nuclei to ²D will be formed in order to search for evidence of a flavor dependence in the EMC effect, giving us new data on the effect of the nuclear environment on quarks. Double ratios between the A=3 mirror nuclei can also provide a direct measurement of d/u ratios at large x thanks to their similar and well understood nuclear corrections. We will also measure (e,e',π+) and (e, e',π-) cross sections as a function of x, Q², z, PT to allow theorists to extract unpolarized TMDs, PDFs and fragmentation functions in A = 3 nuclei. We will also measure flavor-tagged DIS with kaons using the one or two available sectors of CLAS12 RICH.
While there is a dearth of calculations of flavor dependence for A = 3 nuclei, we expect our data will stimulate a surge of new calculations.
This proposal builds on PR12-09-004, a proposal to observe the ratio of gold to deuterium that was determined to have too many nuclear uncertainties. By using ratios of light nuclei, we maintain the sensitivity to the underlying physics but dramatically decrease the nuclear uncertainties due to attenuation and hadronization in heavy nuclei. This experiment is very timely because it will extend the newly published inclusive MARATHON studies of 3H and 3HE to the semi-exclusive regime by flavor-tagging the struck quarks and because it will take advantage of the unique opportunity of the tritium target in CLAS12.
This update describes our response to the PAC49 comments. It shows that higher order (i. e., NLO) effects largely cancel in the cross section ratios, an it presents updated projected results and calculations, including a new theoretical calculation from the JAM group.
Rights
© 2022 The Authors.
Included with the kind written permission of the author.
Original Publication Citation
Gaskell, D., Higinbotham, D. W., Keith, C., Keppel, C., Maxwell, J., Tadepalli, A., Meekins, D., Nguyen, D., Stepanyan, S., Szumila-Vance, H., Denniston, A., Hen, O., Kahlbow, J., Kutz, T., Pybus, J. R., Segarra, E. P., Ayerbe-Gayoso, C., Bhatt, H., Devkota, B.,…Brooks, W. (2022). An update to C12-21-004: Semi-inclusive deep inelastic scattering measurements of A = 3 Nuclei with CLAS12 in Hall B (Report No. C12-21-004). Thomas Jefferson National Accelerator Facility.
ORCID
0000-0002-1265-2212 (Hauenstein), 0000-0001-7282-8120 (Hyde), 0000-0001-5416-2900 (Weinstein)
Repository Citation
Gaskell, D.; Higinbotham, D. W.; Keith, C.; Keppel, C.; Maxwell, J.; Tadepalli, A.; Meekins, D.; Nguyen, D.; Stepanyan, S.; Szumila-Vance, H.; Denniston, A.; Hen, O.; Kahlbow, J.; Kutz, T.; Pybus, J. R.; Segarra, E. P.; Ayerbe-Gayoso, C.; Bhatt, H.; Devkota, B.; Dunne, J.; Dutta, D.; El Fassi, L.; Karki, A.; Amarian, M.; Fogler, C.; Hauenstein, F.; Hyde, C.; Gavalian, G.; Weinstein, L. B.; Li, S.; Cruz Torres, R.; Rittenhouse West, J.; Xiao, Z. G.; Wang, Y.; Xu, J. H.; Ye, Z. H.; Zhang, Y. P.; Griffioen, K.; Bosted, P.; Bianconi, A.; Costantini, G.; Leali, M.; Migliorati, S.; Venturelli, L.; Mascagna, V.; Boyer, A.; Benmokhtar, F.; Gadsby, A.; Parker, A.; Baashen, L.; Raue, B.; Briscoe, W. J.; Ratliff, S.; Schmidt, A.; Seroka, E.; Sharp, P.; Solazzo, P. G.; Strakovsky, I. I.; Adhikari, K.; Niculescu, G.; Brinkmann, K.-T.; Diehl, S.; Kripko, A.; Alsalmi, Sheren; Hague, Tyler J.; Beck, A.; Beck, S.; Cohen, E.; Korover, I.; Johansson, G.; Neuburger, C.; Piasetzky, E.; Nycz, Michael; Capobianco, R.; Haywars, T.; Girod, F.-X.; Joo, K.; Kim, A.; Klimenko, V.; Santos, R.; Shrestha, U.; Simmerling, P.; Richard, J.; Trotta, N.; McKinnon, B.; and Brooks, W., "An Update to C12-21-004: Semi-Inclusive Deep Inelastic Scattering Measurements of A = 3 Nuclei with CLAS12 in Hall B" (2022). Physics Faculty Publications. 935.
https://digitalcommons.odu.edu/physics_fac_pubs/935
Comments
A work of the CLAS Collaboration.
Link to publisher landing page: https://www.jlab.org/exp_prog/proposals/22prop.html