Thursday, Jan. 29, 2015

Have a safe day!

Thursday, Jan. 29

2:30 p.m.
Theoretical Physics Seminar - Curia II
Speaker: Michael Döring, George Washington University
Title: Baryon Spectroscopy: New Results and Perspectives

3:30 p.m.
Director's Coffee Break - WH2XO

Friday, Jan. 30

3:30 p.m.
Director's Coffee Break - WH2XO

4 p.m.
Joint Experimental-Theoretical Physics Seminar - One West
Speaker: Hugh Lippincott, Fermilab
Title: Recent Results from PICO - Searching for Dark Matter with Bubble Chambers

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Wilson Hall Cafe

Thursday, Jan. 29

- Breakfast: Canadian bacon, egg and cheese Texas toast
- Breakfast: Greek omelet
- Ranch house steak sandwich
- Chicken creole
- Barbecue pork spare ribs
- Rustic club flatbread sandwich
- Chef's salad
- Beef and rice soup
- Chef's choice soup
- Assorted pizza by the slice

Wilson Hall Cafe menu

Chez Leon

Friday, Jan. 30
- Zucchini fitters with yogurt dill sauce
- Grilled swordfish with marmalade-ginger glaze
- Spinach risotto
- Lemon cheesecake

Wednesday, Feb. 4
- Menu unavailable

Chez Leon menu
Call x3524 to make your reservation.


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Preserving the data and legacy of the Tevatron

The recently completed Tevatron Run II Data Preservation Project makes the reams of CDF and DZero data available for future analysis.

Since the shutdown of the Tevatron in 2011, there has been a concerted effort to preserve the data and rich physics legacy from the CDF and DZero experiments. The Run II Data Preservation project, completed in December, enables scientists to perform publishable scientific analysis of Run II Tevatron data through at least 2020. Kenneth Herner and Bo Jayatilaka, co-leaders of the project for DZero and CDF respectively, point out that the Run II Data Preservation project enables scientists to revisit a measurement or to test new theoretical calculations long after the original experiments have ended.

“These data sets can potentially verify discoveries made at the Large Hadron Collider,” Jayatilaka said.

“The Tevatron's unique proton-antiproton collision data set enables physics studies that are complementary to those at the LHC," Herner added.

In the world of digital science, "data preservation" means not only preservation of the data set itself, but also of the software to enable future access to that data. The Run II Data Preservation project also addressed documentation and adoption of the sustainable infrastructure needed to ensure that scientists will be able to analyze Run II data in future computing environments.

The need for sustainable data preservation will continue to increase as science advances, experiments become less replicable and data sets become increasingly specialized. Projects such as the Data and Software Preservation for Open Science and the Study Group for Data Preservation in high-energy physics are also working to expand and improve data preservation technology.

Through the Run II Data Preservation project, both CDF and DZero have adapted their data analysis techniques with the long-term computing infrastructure supporting the Fermilab physics program going forward. Herner and Willis Sakumoto, co-leader of the effort at CDF, both emphasize that their users are now able to run their analyses in the long-term supported infrastructure without having to learn new tools.

“The project has accomplished its goal of transitioning CDF analysis infrastructure support so that we can access the data and run the software into 2020 with minimal additional cost to the base program,” Sakumoto said.

DZero users, too, are able to run their analysis using their familiar tools, Herner said.

This two-year-long project was a collaborative effort of experts from CDF and DZero, as well as the Data Management and Applications Group, the Storage Services Group, and the Scientific Software Infrastructure Department of the Scientific Computing Division, to preserve the long-term value of the Tevatron Run II experiments.

The Run II Data Preservation Project Team: Joe Boyd, Project Technical Lead; Ken Herner, DZero; Bo Jayatilaka, CDF; Rob Kennedy, Project Manager; Willis Sakumoto, CDF

In Brief

Summer hire program looking for personnel requisitions

It’s that time of year again! Despite the snow, we are preparing for our summer hire program. The Employment Department is asking for seasonal personnel requisitions beginning on Feb. 1, 2015. All requisitions must be submitted in FermiWorks. Learn how to create a seasonal hire requisition in FermiWorks.

The deadline for requisition submission is April 17. The seasonal employment period runs from May 4-Sept. 30.

If you have questions regarding the summer hire program, please contact your HR =partner or Kathleen Venn Bowers at x4367.

Photo of the Day

Coat of ice

Grass is dusted with frost. Photo: Leticia Shaddix, PPD
In the News

The future of physics: Q&A with Leonard Susskind

From Huffington Post, Jan. 26, 2015

In another few months the Large Hadron Collider will be powered up to explore its maximum energy range. Many physicists fervently hope we will see definite signs of "new physics," especially a phenomenon called "supersymmetry." In the simplest view, the Standard Model souped-up with supersymmetry will offer a massive new partner particle for every known particle (electron, quark, neutrino, etc). One of these, called the neutralino, may even explain dark matter itself!

Supersymmetry is the foundational cornerstone on which string theory rests. That's why physicists call this "stringy" theory of matter "superstring theory." If the LHC does not turn up any signs of supersymmetry during the next two or three years, not only will simple modifications to the current Standard Model be ruled out, but the most elegant forms of supersymmetry theory will fall too.

Read more

Frontier Science Result: DZero

Heavy light and heavy quarks

The top diagram shows one of several ways to create a Z along with a bottom quark-antiquark pair. The initial quark and antiquark on the left are partons in the proton-antiproton collisions of the Tevatron.The bottom diagram shows a similar process without the Z. Because the Z is so massive, the gluon, shown in bright blue, will have different energy and momenta in the two cases.

The force that holds a proton together also makes it more difficult to figure out what happens when protons and antiprotons collide. When a parton — a particle inside the proton — is produced in a collision, it feels the strong nuclear forces that hold the proton together. Those forces will rapidly deflect or decelerate the parton as it leaves the collision, and so the parton you actually can measure is not quite the same as the parton originally produced.

One way around this problem is to look at collisions that produce particles that do not feel the strong force. Such particles will not be deflected or decelerated before being measured. One such particle is the Z boson. The Z is much like the photon, the particle of light, but it does not travel at the speed of light, since the Z (unlike the photon) has mass. So you might think of a Z as heavy light.

There is a second reason to look at proton collisions that produce Zs. The Z is about 100 times more massive than the proton and the energy needed to produce that mass is not available for creating other particles. That is different from the case where a massive particle is not created, and a theoretical calculation that works in one case might not work in the other.

Now about the heavy quarks. Protons don’t contain bottom quarks, per se. They do contain gluons that can turn into bottom quark-antiquark pairs. (You may remember the phrase "sea quarks" from the December 18, 2014 DZero column; b quarks in protons are always sea quarks.) So measuring the production of bottom quark-antiquark pairs tells us about the gluon content of the proton. Measuring the production of bottom quark-antiquark pairs produced together with a Z tells us about the gluon part when a lot of the collision energy goes into making a heavy particle.

DZero has recently measured the production of a Z with a bottom quark-antiquark pair. More precisely, what we measured was the ratio of the production of a Z with two jets produced from bottom quarks over the production of a Z with two jets of any sort. In this way, many possible causes of measurement uncertainty are removed. The result, a ratio of 2.36 ± 0.47 percent, matches the existing theoretical calculations well, strengthening our confidence in our understanding of the gluon content of the proton. It also provides an important constraint on the backgrounds for such rare processes as Higgs boson production. This is the first measurement of this important ratio at hadron colliders, shedding heavy light on heavy quarks.

Leo Bellantoni

The following scientists contributed to this result: top row, from left: Manbir Kaur and Suman Bala, Panjab University; Ashish Kumar, SUNY. Second row, from left:Thomas Hebbeker, RWTH Aachen University; Karl Jacobs, Freiburg University. Third row, from left: Arnulf Quadt, Georg-August University, Gottingen; Volker Buescher, University of Mainz; Dorothee Schaile, Ludwig-Maximilians University, Munchen. Fourth row, from left: Peter Maettig, University of Wuppertal; Norbert Wermes, University of Bonn.

Fermi Philosophy Society - Jan. 29

Zumba Fitness registration due Jan. 29

English country dancing at Kuhn Barn - Feb. 1 and March 1

Windows users: Adobe software upgrade and licensing change - Feb. 3

Vaughan Athletic Center membership rates effective Feb. 3

Artist Reception - Feb. 4

Barnstormers Delta Dart Night - Feb. 11

Writing for Results: Email and More - Feb. 27

Fermilab Functions - March 3, 5, 11

Interpersonal Communication Skills course - March 10

Managing Conflict course - March 24

2015 FRA scholarship applications accepted until April 1

URA Thesis Award Competition

Microsoft Office 2013 eBooks

Windows 8.1 approved for use

GSA updates mileage rate to 57.5 cents for 2015

Fermi Singers seek new members in New Year!

Abri Credit Union appreciates our members

The Take Five challenge and poster winter 2014/2015

Scottish country dancing Tuesday evenings at Kuhn Barn

Indoor soccer