Correlated Nucleons May Solve 35-Year-Old Mystery
A careful re-analysis of data has revealed a possible link between correlated protons and neutrons in the nucleus and a 35-year-old mystery. The data have led to the extraction of a universal function that describes the EMC Effect and supports an explanation for the effect. Read more here.
Spring Run Underway
Beam delivery for the 2019 spring run continued through the week and over the weekend, with some unusual challenges emerging late in the weekend. Early Sunday morning, a problem in the low-conductivity water system affecting Halls A, B and C was tracked down to a leak in a spare power supply for the Hall C High Momentum Spectrometer Q2. Hall D took beam throughout.
Later in the day, it was found that a higher voltage than normal (508 MV) was coming through the 480 MV substation, a problem that necessitated a call to Dominion Power to rectify. After recovery from these items, delivery continued through the first of the week, with Accelerator Operations staff looking forward to radiofrequency recovery efforts on Tuesday to enable better beam the rest of the week.
THEORETICAL AND COMPUTATIONAL PHYSICS Extracting parton distributions from lattice QCD
Since parton distribution functions (PDF) cannot be directly calculated from lattice QCD, one must instead calculate quantities related to PDFs by integral equations. As the range of data available to lattice calculations is limited, the extraction of PDFs from lattice QCD calculations constitutes an ill-posed "inverse problem". A new study tests three methods for solving this inverse problem: the Backus-Gilbert inverse method, parameterizing the PDF with a neural network, and finding the most probable PDF through a Bayesian inference.
Be Aware - Hazards of Hand Tools
According to the Occupational Safety and Health Association (OSHA), a hand tool is any tool that is powered manually. The greatest hazards posed by hand tools result from misuse and improper maintenance. Some examples include:
Using a chisel as a screwdriver may cause the tip to chip and fly off, endangering the user or others
A wooden handle may splinter or crack
The jaws of a wrench might slip
Mushroomed heads of impact tools are prone to impact shatter, sending sharp fragments flying
Know how and when to use hand tools and equipment. Make sure that they are maintained properly. Direct the tool away from yourself and any employees working in close proximity. Remove damaged tools from service. Be aware of the hazards that accompany hand tool use. For more information, read more here.
DEWALT Drill Recall
DEWALT has identified a potential safety issue with the internal wiring of some of the following drills which may create a shock hazard.The affected models are DEWALT Model DWD110 and DWD112 3/8-inch VSR Drills. You should stop using these drills immediately. For more information on the recall, read more here.
FACILITIES MANAGEMENT AND LOGISTICS Return Your Totes
The property section is responsible for the logistical support of lab personnel when moving from one work space to another. One of the ways they help with internal moves is to provide yellow totes for moving, but often the totes are not returned or are used as storage. The totes must be returned to support the large number of folks who will be moving out of their offices and work spaces in the next weeks in preparation for upcoming construction projects. If you are holding these totes, unload them, contact property and they will arrange to pick them up. For more information contact Christian Whalen at x5899 or at email@example.com.
CCPR Rollout to ServiceNow
On March 4, 2019, the IT Division will roll out a flexible, cloud-based incident management system from ServiceNow. This new system will replace the Computer Center Problem Report (CCPR) system. ServiceNow will be used to track all computing incidents and will be available both on-site and off-site. While there will be a new, easy to use web form introduced, emailing the Help Desk will continue to submit computing incidents to the IT Division. If you have questions or concerns regarding this new system, contact the IT Division Help Desk at x7155 or firstname.lastname@example.org
Middle School Science Bowl Volunteers Still Needed
The High School Science Bowl was a great success, thanks to lab staff who volunteered their time, however volunteers are still needed for the March 2 Middle School Science Bowl. For more information, read more here.
Available Now - Alternate Work Schedule Toolkit
The Alternate Work Schedule (AWS) and Flex Schedule request forms are now available on the HR AWS/Flex webpage along with other resources. AWS requests require both supervisor and Division Head/Associate Director approval and up to a 30 day cycle time to review/render a decision. Flex Schedule request forms require supervisor approval and a one week cycle time to review and approve.
While you can request an AWS or Flex Schedule at any time, if you’d like to begin working an AWS on April 1, 2019, you will need to submit your request by Feb. 28. Anyone who currently has an informal alternate schedule arrangement will need to submit the appropriate form (AWS or Flex) to formally have the schedule reviewed, approved and recorded in the timekeeping system.
Not sure if this is right for you or someone you supervisor? Check out the AWS/Flex Decision Making Toolkit to help guide you through the process. Looking for all the details, FAQs, and forms? Head to the AWS/Flex page!
JSA M&O Contract Update
The Management & Operating Contract between JSA and DOE has been updated to a conformed, current version. Lab personnel utilizing this document will no longer need to look for and follow “buttons” as the document now presents the current iteration. The contract can be found on the Jefferson Lab website Publications page; Lab Plans & Measures; JSA/DOE Contract – DE-AC05-06OR23177 . The mod listing has not changed and can still be accessed through this page as well. Direct all inquiries concerning the contract to Krystina Patrick at email@example.com.
CONTACT The JLab Weekly provides information on the status of safety, accelerator operations, experiments, reviews, upcoming activities and special events. Deadline for submission is every Tuesday by 10 a.m. Submit new items to: the Communications Office or contact Deborah Dowd at x7180.
PUBLISHED JOURNAL ARTICLESFeb. 10-16, 2019
Zheng-Yang Li, Yan-Qing Ma, and Jian-Wei Qiu. "Multiplicative renormalizability of operators defining quasiparton distributions." Phys. Rev. Lett. 122 (2019) 062002.
J. A. Silva-Castro, C. Fernández-Ramírez, M. Albaladejo, I. V. Danilkin, A. Jackura, V. Mathieu, J. Nys, A. Pilloni, A. P. Szczepaniak, and G. Fox (Joint Physics Analysis Center). "Regge phenomenology of the N* and Delta* poles." Phys. Rev. D 99 (2019) 034003.
Jen-Chieh Peng, Daniel Boer, Wen-Chen Chang, Randall Evan McClellan, Oleg Teryaev. "On the rotational invariance and non-invariance of lepton angular distributions in Drell–Yan and quarkonium production." Phys. Lett. B 789 (2019) 356-359.
Bo Zhao, Andrey Kim, Kyungseon Joo, Ivan Bedlinskiy, Wooyoung Kim, Valery Kubarovsky, Maurizio Ungaro. et al. " Measurement of the beam spin asymmetry of ep -> e'p'n' in the deep-inelastic regime with CLAS." Phys. Lett. B 789 (2019) 426-431.
Author.xml tool available at inSPIRE
When creating an author.xml file to submit with your publications, try the easy author xml tool at inSPIRE. If you don't already have an ORCID, consider signing up for one at orcid.org.
This week we recognize the birthday of American theoretical scientist and string theorist David Gross, February 19. This week's photo features the attendees of the QCD Evolution Workshop at Jefferson Lab, May 2012.
Note: Last week, on the archives website, the caption mistakenly noted that the 2019 Conference for Undergraduate Women in Physics (CUWiP) was co-hosted by Jefferson Lab and Old Dominion University. This year's conference was, in fact, co-hosted by Jefferson Lab and the College of William and Mary. The caption has been corrected.