Thursday, Jan. 15, 2015

Have a safe day!

Thursday, Jan. 15

2:30 p.m.
Theoretical Physics Seminar (NOTE LOCATION) - WH3NE
Speaker: Jared Evans, University Illinois, Urbana-Champaign
Title: The Higgs, Flavor, and Large A-terms in Extended Gauge Mediation

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

4 p.m.
Accelerator Physics and Technology Seminar - ICB Hermitage
Speaker: Rong-Li Geng, Thomas Jefferson National Accelerator Facility
Title: Review of Key Issues to Advance: The Realization of Next Generation SRF Linacs

Friday, Jan. 16

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

4 p.m.
Joint Experimental-Theoretical Physics Seminar - One West
Speaker: John Paul Chou, Rutgers University
Title: New Physics from CMS: Hints from Run 1 and Prospects for Run 2

8 p.m.
Fermilab Lecture Series - Ramsey Auditorium
Speaker: Dan Hooper, Fermilab
Title: Revealing the Nature of Dark Matter
Tickets: $7

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Wilson Hall Cafe

Thursday, Jan. 15

- Breakfast: Canadian bacon, egg and cheese Texas toast
- Breakfast: Mexican omelet
- Steak soft tacos
- Roasted pork loin with orange mustard glaze
- Chicken vindaloo
- Roast beef and cheddar wrap
- Mandarin orange pecan chicken salad
- Beef barley soup
- Chef's choice soup
- Assorted pizza by the slice

Wilson Hall Cafe menu

Chez Leon

Friday, Jan. 16
- Stuffed mushrooms
- Filet mignon with cabernet sauce
- Roasted new potatoes
- Green bean and blue cheese gratin
- Strawberry crepe

Wednesday, Jan. 21
- Rouladen
- Buttered egg noodles
- Dilled baby carrots
- German chocolate cake

Chez Leon menu
Call x3524 to make your reservation.


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Sergei Nagaitsev appointed professor part-time at University of Chicago

Sergei Nagaitsev

Sergei Nagaitsev, head of Fermilab's Accelerator Division, has been appointed professor part-time in the Department of Physics and the Enrico Fermi Institute at the University of Chicago.

The new appointment allows Nagaitsev to supervise his own graduate students, apply for grants under the University of Chicago banner and teach.

The five-year appointment began Jan. 1.

In Brief

Migration to Office 365 begins Jan. 21

The Core Computing Division is upgrading all computers using Microsoft Office to Office 2013 (Office 365) beginning Jan. 21. Migrations will take place in groups over the next several weeks. You will receive an email message from the Service Desk on the Thursday before your computer is scheduled to migrate.

There are a few items about the migration that you should be aware of:

  • Office users will need to enter their username in the format the first time they attempt to access an Office 365 application to activate the license. This action is needed one time only per computer.
  • For Windows users, there are significant interface changes in this version of Office. Mac users will have the same look and feel of the applications until next year, when the new version of office for Mac is released. For more information about Office 365 and details about the migration, see these FAQs for Windows users or for Mac users
  • The installation process for Windows, described in the FAQ, may take as long as one hour. We have timed the installation to begin early in the morning so it will be complete by the time individuals arrive at work.

Further details about what individuals will need to do to prepare for the migration will be included in the email to individual users prior to their migration. However, we encourage you to read the FAQs at the links above.

In Brief

Chicago Harp Quartet draws crowd at Fermilab

The Chicago Harp Quartet performed in the Fermilab Art Gallery on Jan. 11. Photo: Georgia Schwender, OC

The Chicago Harp Quartet performed at Fermilab on Jan. 11 to a packed house as part of the laboratory's Gallery Chamber Series. They performed works by John Adams, J.S. Bach, Enrique Granados, Philip Glass, Jules Massenet and others.

Janet MacKay-Galbraith, Fermilab performing arts program manager, introduces the Chicago Harp Quartet to attendees at the sold-out performance. Photo: Georgia Schwender, OC
Photo of the Day

Wintry Wilson Hall

Snow settles over the Wilson Hall portico. Photo: Kris Brandt, CCD
In the News

Artist explores Fermilab neutrino research at Water Street Studios solo exhibit

From Downtown Auroran, Jan. 7, 2015

Water Street Studios presents their first solo exhibition this month, in which artist Meghan Moe Beitiks explores the acts and apparatuses of neutrino research and detection at the Fermilab particle physics and accelerator laboratory, employing interviews with physicists and perceptions of her own identity. Curated by Ross Stanton Jordan.

Artist Meghan Moe Beitiks interviewed four experimental physicists from Fermilab National Accelerator Laboratory about their daily interactions with neutrinos, their own experiences of role and identity, and their perceptions of her as a person. The result is four different video installation "systems," based on those interviews, the detectors, and the four possible identities of neutrinos.

Read more

In the News

Topcites 2014 edition

From INSPIRE blog, Jan. 13, 2015

In the world of topcited papers, 2014 looked a lot like 2013 and not just because the Review of Particle Physics is once again at the top. The effects of 2012's discovery of the Higgs boson continued to be strongly felt and many of the related papers from the 2013 topcite list appeared again in more or less the same position. Along with the discovery papers themselves, the original theory papers and the detector description papers, a host of papers relevant to event simulation at the LHC have featured prominently; interestingly, the PYTHIA paper is now the first paper from the 2000s in the All Time Topcite list. The AdS/CFT papers and Randall-Sundrum continue their 15+ year run on the Topcite list. Planck, WMAP and the 1998 supernova cosmology papers again represent observational cosmology on the list.

Read more

Frontier Science Result: CDF

Two neutrinos are a problem

The plot shows the fit to the dilepton data sample. The data are the points with error bars. The background (purple) and the signal plus the background (cyan) for the reconstructed top quark mass are normalized to the numbers returned by the fit.

Nearly 30 years ago, the first pair of protons and antiprotons collided in the Tevatron. Ten years later the CDF and DZero experiments announced the discovery of the top quark, the heaviest known member of the Standard Model. Its mass, comparable to that of an atom of gold, is a fundamental parameter of the Standard Model. It contributes valuable information needed to constrain and to provide a consistency check of the Standard Model and must be measured experimentally. Recent theoretical developments may attach an even more important role of this Standard Model parameter — the fate of the universe. This is why the top quark continues to fascinate many physicists working on the Tevatron and LHC experiments.

At the Tevatron, top quarks were produced primarily in pairs, and each nearly always decayed into a bottom quark, producing b jet and a W boson. The W boson can decay in many ways, including into a pair of leptons (electron or muon) and its corresponding neutrino. Today's result, using the full CDF Run II data set, describes the final CDF measurement of the mass of the top quark for events in which both W bosons — one each from the top and the antitop quark — decay into leptons, the so-called dilepton channel. The mass measurements in this channel are not the most accurate. However they provide direct confirmation that the observed events are due to the Standard Model top quark. A significant discrepancy compared to measurements in other channels, namely the lepton-plus-jets and all-hadronic channels, could indicate new physics.

The dilepton channel features two main characteristics: a very low background and incomplete information on what exactly happened during the event, due to the two undetected neutrinos present in W decays.

The latter feature makes it impossible for scientists to fully reconstruct the event, meaning that we cannot accurately determine the jet energy. In other measurements of the top quark mass, specifically in which the W boson decays into two quarks instead of into a charged lepton and an undetected neutrino, the known W mass is used to improve our limited knowledge of jet energy in the event.

To try to overcome the problem of having limited information, CDF scientists developed a new optimal method for measuring the top quark mass in the dilepton channel. The method uses a "hybrid" variable sensitive to the true value of the top mass. The variable contains two parts: one that depends on the reconstructed top quark mass and one that depends on the mass constructed from complete knowledge of the leptons and the direction of the b jets. The second part does not depend on our limited knowledge of the jet's energy.

Mixing the weights of these two parts, CDF physicists can optimize the total uncertainty of the measurement.

With all improvements, the new method returns a value of the top quark mass of 171.46 ± 3.15 GeV/c2. The method improves the total measurement uncertainty by 15 percent compared to our older measurement, which used only the reconstructed mass. This is the most accurate value of the top quark mass obtained at the Tevatron in the dilepton channel without an external constraint of the jet energy scale from non-dilepton top-antitop events. Our measurement is consistent with the current world average, which includes our previous measurement in the dilepton channel: 173.34 ± 0.76 GeV/c2.

edited by Andy Beretvas

Learn more

These scientists are the primary analysts for this result. Top row, from left: Julian Budagov and Vladimir Glagolev, both from JINR, Dubna. Second row, from left: Igor Suslov (JINR, Dubna) and George Velev (Fermilab).

Today's New Announcements

Barn Dance - Jan. 18

Vaughan Athletic Center membership rates effective Feb. 3

Muscle Toning registration due today

Lecture Series: Revealing the Nature of Dark Matter - Jan. 16

International folk dance workshop with Lee Otterholt - Jan. 22

Register for ELBNF collaboration meeting - Jan. 22-23

Managed print upgrade - Jan. 25

Writing for Results: Email and More - Feb. 27

Interpersonal Communication Skills course - March 10

Managing Conflict course - March 24

Fermilab Functions - March 3, 5, 11

2015 FRA scholarship applications accepted until April 1

GSA updates mileage rate to 57.5 cents for 2015

OS X 10.10 Yosemite certified for use

2015 float holiday

Charitable donations through payroll deduction

The Take Five challenge and poster winter 2014/2015

Scottish country dancing Tuesday evenings at Kuhn Barn

Indoor soccer

Fox Valley Fitness offers employee discount