Thursday, May 22, 2014

Thursday, May 22

8 a.m.-7 p.m.
5th High-Power Targetry Workshop - One West
Register in person

12:30 p.m.
Undergraduate Lecture Series (NOTE TIME) - Curia II
Speaker: Elliott McCrory, Fermilab
Title: Lecture Series Overview


3:30 p.m.

4 p.m.
Accelerator Physics and Technology Seminar (NOTE DATE, LOCATION) - Curia II
Speaker: Tengming Shen, Fermilab
Title: High-Temperature Superconducting Magnets: Pushing Limits

Friday, May 23

8 a.m.-3 p.m.
5th High-Power Targetry Workshop - One West
Register in person

11 a.m.
Academic Lecture Series (NOTE DATE) - Curia II
Speaker: Mayly Sanchez, Iowa State University
Title: Challenges for Long-Baseline Neutrino Experiments

3:30 p.m.

4 p.m.
Joint Experimental-Theoretical Physics Seminar - One West
Speaker: Junjie Zhu, University of Michigan
Title: First Evidence of Same-Sign WW Vector Boson Scattering Process at ATLAS

Click here for NALCAL,
a weekly calendar with links to additional information.

Ongoing and upcoming conferences at Fermilab


Take Five

Weather Mostly sunny

Extended forecast
Weather at Fermilab

Current Security Status

Secon Level 3

Current Flag Status

Flags at full staff

Wilson Hall Cafe

Thursday, May 22

- Breakfast: Canadian bacon, egg and cheese Texas toast
- Breakfast: Greek omelet
- Ranch house steak sandwich
- Asian beef and vegetables
- Coq au vin
- Rustic club flatbread sandwich
- Peruvian beef and potato stir fry
- Chicken noodle soup
- Chef's choice soup
- Assorted pizza by the slice

Wilson Hall Cafe menu

Chez Leon

Friday, May 23

Wednesday, May 28
- Santorini salad with grilled shrimp
- Lemon Napoleon

Chez Leon menu
Call x3524 to make your reservation.


Fermilab Today

Director's Corner

Frontier Science Result

Physics in a Nutshell

Tip of the Week

User University Profiles

Related content


Fermilab Today
is online at:

Send comments and suggestions to:

Visit the Fermilab
home page

Unsubscribe from Fermilab Today

Special Announcement

All-hands meeting - May 28

An all-hands meeting will be held on Wednesday, May 28, at 9:30 a.m. in Ramsey Auditorium. Director Nigel Lockyer will discuss the P5 report and how Fermilab's scientific program will align with the 10-year plan. The report will be presented today at the HEPAP meeting in Washington, D.C.


The science of love: local theater group performs play set at Fermilab

Scientist and intern fall in love in a play set at Fermilab. Photo courtesy of Village Theatre Guild

Lisa Dolnics says she wasn't thrilled at first with the idea of "now then again," a romantic play set in the halls of Fermilab. But once she read it, she fell in love, much like the play's two protagonists. She enjoyed it so much, in fact, that she asked to direct it. Dolnics' production of "now then again" with the Village Theatre Guild of Glen Ellyn opens on Friday, May 23.

What was it about this story that captivated Dolnics? The play, written by Penny Penniston, traces the love story between a Fermilab physicist and an intern. The story moves forward and backward in time, incorporating quantum physics concepts along with warm-hearted humor. While the science is complex, Dolnics said, the tale remains straightforward.

"It's about how people find each other, about being in the right place at the right time," she said.

Penniston's play premiered in 1999 in Chicago and won the Joseph Jefferson Award as an outstanding new work in Chicago theater for the 1999-2000 season. On Sept. 16, 2000, it was performed at Fermilab and met with accolades from scientists. Leon Lederman, Fermilab's second director, called it "a very provocative and surprising play about time, science fantasy, the portrayal of characters, and the eternals of love, chance and humor."

When developing the play, Penniston reached out to Fermilab and received assistance from Judy Jackson, former head of the Office of Public Affairs, and Morris Binkley, a physicist on the CDF experiment.

Dolnics said a seven-member committee read more than 100 plays when selecting the Guild's current season, and "now then again" stood out. Several cast members have science backgrounds, including Terry Wehrman, who plays Henry, the male lead. The play's subject matter opened up many interesting discussions during rehearsals, Dolnics said.

But for the audience, she said, it will be the love story that resonates.

"I think people will understand it," she said. "It's about a relationship, about finding the right person."

Andre Salles

The Village Theatre Guild is now in its 51st year. Its plays are performed in a one-room theater that was once a schoolhouse and seats about 60. Performances of "now then again" will continue through June 14.

Photo of the Day

Coyote sleepy

A coyote takes a nap by MI-8. Photo: James Zahurones, AD
In Brief

Pioneer Cemetery walk

Fermilab's Adrienne Kolb (left, with papers) led Tuesday's Pioneer Cemetery walk. Photo: Georgia Schwender, DO

On Tuesday about 25 people attended the Pioneer Cemetery walk. Fermilab Historian and Archivist Adrienne Kolb gave an overview of the cemetery's history and the deceased buried there. Learn about the cemetery at the Fermilab Archives.

In the News

Proposed experiment would create matter from light

From Science News, May 18, 2014

​A proposed experiment may soon transform particles of light into matter.

​Oliver Pike, a plasma physicist at Imperial College London, typically works on nuclear fusion — a process that converts matter into energy and not vice versa. But he and his colleagues laid out plans for a device that would use a key piece of fusion equipment to convert light, a form of energy, into particles with mass. It would do so by smashing photons together to create electrons and their antimatter counterparts, positrons. Physicists have never observed this process in the lab.

Read more

Frontier Science Result: CDF

Is the top hiding a charged Higgs?

A Feynman diagram showing the production and decay of a top-antitop pair. In the upper part, a top quark decays into a W+ and anti-b quark. The W+ then decays into a tau lepton and a neutrino.

The heaviest of the six quarks, the top quark, decays according to Standard Model into a charged lepton, a neutrino and a bottom quark.

In most analyses at the Tevatron and LHC experiments, scientists saw this decay through an intermediate particle, the W boson. The W boson decays into either an electron or a muon, both of which belong to the charged-lepton family.

The W boson can also decay into a third type of charged lepton, the tau lepton, which is heavier than an electron or a muon. (See the top figure.)

This tau lepton decay channel is less explored than the other two because it is more challenging to identify. After the tau lepton decays in the detector, the CDF level 1 track trigger — instrumentation that helps with the rapid selection of important events among the hundreds of trillions that occur inside the detector — selects the tau leptons. Finally, offline software reconstructs the tau from its fragments.

The W boson isn't the only particle that could decay into a tau. Certain new particles, like additional Higgs bosons, could provide further decay channels with a preference for heavy particles, including taus.

A top quark, then — through either a W boson or a new particle such as a Higgs — decays into a tau lepton, a tau neutrino, and a bottom quark. Analyzing this decay channel will help scientists assess the effects of new physics.

CDF measures the number of taus produced from top-antitop pairs. The number is the product of the production of top-antitop pairs, called the cross section, and the fraction of the pairs that decay into taus, called the branching fraction. New physics could modify either rate, so when we see evidence of new physics, we can't be sure which of the two is affected. With two unknowns, our one equation won't help us solve the problem.

So we come up with a second equation using a second set of data.

This CDF analysis separates for the first time single-tau from two-tau events to effectively get the second equation for the two unknowns. We can then measure the branching fraction of the top quark into a tau lepton independently of the cross section.

Our result is that the branching fraction for top quark into a tau lepton, tau neutrino and bottom quark is 9.6 ± 2.8 percent, which is in agreement with the Standard Model.

This measurement, which depends on our understanding of the upper figure, can be used to calculate branching fraction shown in the lower figure.

We are able to exclude a branching fraction of a top quark into a charged Higgs boson (in the mass range from 80 to 140 GeV/c2) and a bottom quark at the 5.9 percent level. The exclusion is at the 95 percent confidence level and is comparable with recent measurements at the LHC.

Learn more

edited by Andy Beretvas

A Feynman diagram showing the production and decay of a top-antitop pair. In the upper part, a top quark decays into a H+ and anti-b quark. The W+ then decays into a tau lepton and a neutrino.
These CDF physicists contributed to this data analysis. Top row from left: Matteo Corbo (Université Paris 6/CNRS), Chiara Rizzi (Fermilab, now at the University of Milano, INFN). Second row: Stephan Lammel (Fermilab) and Aurore Savoy-Navarro (Université Paris 7/CNRS).

Fermilab Summer Day Camp registration - due May 23

Lecture Series : Quantum Universe - Hitoshi Murayama - June 11

Registration open for annual Fermilab Users Meeting - June 11-12

The CIE + Cisco EIR Innovation Challenge - due June 15

On the Spot - nominate staff for Fermilab Spot Award

Be a winner! Take the Take Five Challenge spring 2014

Fermi pool memberships

Water aerobics registration

Preschool and beginner swim lesson registration

Thursday night golf at Arrowhead Golf Course

Abri Credit Union new financial advisor