Thursday, May 19, 2011

Have a safe day!

Thursday, May 19
2:30 p.m.
Theoretical Physics Seminar - Curia II
Speaker: Gavin Salam, CERN
Title: Giant K-Factors
3:30 p.m.
4 p.m.
Accelerator Physics and Technology Seminar
One West
Speaker: Alexey Burov, Fermilab
Title: Theory, Observations and Mitigation of Dancing Bunches in the Tevatron

Friday, May 20
3:30 p.m.
4 p.m.
Joint Experimental-Theoretical Physics Seminar - One West
Speaker: Karen Bland, Baylor University
Title: Lighting Up the Higgs Sector with Photons at CDF
8 p.m.
Fermilab Arts Series - Auditorium, Tickets: $7
Dr. Alexei Filippenko, University of California, Berkeley presents: Dark Energy & The Runaway Universe

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a weekly calendar with links to additional information.

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Wilson Hall Cafe

Thursday, May 19

- Breakfast: Apple sticks
- Minnesota wild rice w/ chicken
- Tuna melt on nine grain
- * Italian meatloaf
- Chicken casserole
- Buffalo crispy chicken wrap
- Assorted sliced pizza
- *Chicken pecan salad

*Heart healthy choice

Wilson Hall Cafe Menu

Chez Leon

Friday, May 20
- Melon & prosciutto
- Porcini-crusted filet mignon with fresh herb butter
- Glazed baby carrots
- Loaded mashed potatoes
- White chocolate-raspberry crème brûlée

Wednesday, May 25

- Chopped shrimp “Waldorf” salad
-Strawberry cheesecake

Chez Leon Menu
Call x3524 to make your reservation.


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Recent results, future plans focus of neutrino workshop

The MiniBooNE detector, shown above, was one project at the recent Short-Baseline Neutrino Workshop that presented interesting results. Photo: MiniBooNE collaboration.

When exciting results are popping up all over the place, it calls for bringing the best minds together from around the world to discuss the findings and make plans for the future. That’s precisely what happened at the Short-Baseline Neutrino Workshop 2011, which took place May 12-14 at Fermilab. More than 100 people from 44 institutions attended.

Neutrinos are a million times lighter than an electron and are electrically neutral, which allows them to pass through matter unaffected, making them difficult to detect. Neutrinos exist in three flavors: muon, electron and tau, and have the ability to transform from one flavor into another, a process known as oscillation.

The purpose of various short-baseline neutrino experiments is to explore questions about neutrinos that travel over a relatively short distance.

Recently, a number of tantalizing results have sprung up from both short and long baseline experiments, which seem to suggest that neutrino oscillations occur under circumstances that were previously believed to not allow them, said Bill Louis, physicist at Los Alamos National Laboratory and workshop co-organizer.

“Even if just one of these results is correct, it may possibly have a profound impact on our understanding of particle and nuclear physics,” Louis said.

Learning more about this area of physics is a key part of Fermilab’s future.

A few months after the Tevatron shuts down, there will be an 11-month period during which scientists will improve on proton sources to better serve experiments at the Intensity Frontier, including neutrino, kaon and muon programs, said Fermilab Deputy Director Young-Kee Kim. Once the complex comes back online, Fermilab plans to resume operation of neutrino beams using both 120 GeV and 8 GeV protons on the neutrino-production targets.

In their lectures, Steve Holmes, project manager for the proposed Project X, and Chris Polly, acting project manager for the future muon g-2 experiment at Fermilab, touched on the topic of the proposed beamlines. Kim further discussed future plans and solicited attendee feedback.

The ensuing discussions yielded a consensus amongst workshop attendees: The beamlines have tremendous potential, but measures will need to be taken to minimize background signals caused by cosmic radiation. Some possibilities include reusing or repurposing already existing equipment, or building additional components, which could result in a high-intensity neutrino beam that would be suitable for future experiments.

Read more

— Christine Herman



Patrick Hughes, a former Fermilab employee who worked in the Machine Shop, died May 9 after battling pancreatic cancer. Read his obituary.

Readers write

Thank you for your support

Dear all,

In the wake of the March 11 earthquake and tsunami many Fermilab employees, users and their families demonstrated support for their Japanese colleagues working in Japan and at Fermilab. Contributions were sent to aid the Japanese disaster relief efforts through the American Red Cross.

Thank you very much for your support.

Kyoko Kunori
Kaori Maeshima
David Mason
Kiyomi Seiya
Mizuho Yonehara

In Brief

Relocation survey

Did you change cities, states or countries when you came to Fermilab? If so, Fermilab's International Services Office would love to speak with you. The International Services Office is collecting information about individuals’ experiences relocating to Fermilab and adjusting to our unique environment. The goal is to identify events or issues that make the relocation process more enjoyable or difficult and then to develop resources and systems to help with the transition - for employees, visitors and accompanying family. Your participation will enable us to understand the issues that arise, as well as gain suggestions about possible resources that can be provided to ease the transition process. Take the survey online. Contact Haley Pschirrer via email, or at x2586, or visit the research website.

In the News

Cosmic rays mapped across the southern sky

From, May 12, 2011

Physicists have produced the first complete map of the high-energy cosmic rays that bombard the Earth from the southern sky. The researchers have discovered an excess of cosmic rays coming from certain directions, which may link to nearby sources, including pulsars.

The data for the map were captured by IceCube, a neutrino detector in Antarctica that was completed last December after six years of construction. While IceCube was designed primarily to detect cosmic neutrinos, a team of researchers have been using the partially built experiment to detect cosmic rays originating from across the Milky Way. These charged particles are of interest to astrophysicists because they can reveal information about their sources and the intervening space through which they have travelled.

Read more

Result of the Week

The Tevatron’s top saga

We’ve come a long ways since the first Tevatron collisions in 1985. Not only did Fermilab scientists discover the top quark in 1995, but we can now measure its mass to a precision better than 1 percent.

In 1985, the first pair of protons and antiprotons collided in the Fermilab Tevatron. One of the main purposes for which the Tevatron was built was to search for the top quark and, after 10 years, DZero and CDF jointly announced the particle’s discovery in February of 1995. Discovering the top quark wasn’t easy. In order to claim observation of the top quark, the collaborations had to show that it was observed in several different decay paths.

More than 16 years later and with a data set that is about 100 times larger; our ability to measure properties of the top quark is much improved. Specifically, by combining all of the various measurements in 1995, we estimated the mass of the top quark with a precision of about 10-15 percent. Now, collaborators can achieve about 1 percent precision with individual measurements and can make an even more accurate measurement by combining them. (And this is only exploiting half the data we’ve taken. Analyses as delicate as the one described here take time and a measurement using all the data will be reported in due course.)

Top quarks are produced in pairs and essentially always decay into a bottom quark and a W boson. The W boson can decay in many possible ways, for example into a pair of quarks or either an electron or muon and its corresponding neutrino. Today’s result describes a measurement of the mass of the top quark using events in which both W bosons decay into electrons or muons. Because the generic word for electron and muon is lepton, these are called dilepton decays.

These kind of dilepton decays occur only 4 percent of the time, but have a very striking signature of two bottom quarks, two leptons and missing energy caused by neutrinos escaping the detector undetected. This measurement is the most precise dilepton measurement to date and determined by itself the mass of the top quark better than 2 percent. When combined with other measurements, the mass of the top quark is now known to a precision of better than 1 percent. By any measure, this is a scientific success that was only a dream a quarter century ago, when those first collisions occurred.

Don Lincoln

These physicists performed this analysis.
These physicists are the main system administrators for the DZero Linux cluster, which is a crucial component to the DZero experiment’s ability to analyze their data.
Accelerator Update

May 16-18

- Three stores provided ~14.25 hours of luminosity
- Tevatron repaired wet engines at A3 and F3
- NuMI's target failed, experiment off for one month
- Tevatron D2 wet engine blew seal, caused store 8741 to quench
- Tevatron quenched during checkout when quench protection monitor rebooted itself
- Tevatron personnel conducts crystal collimator study

Read the Current Accelerator Update
Read the Early Bird Report
View the Tevatron Luminosity Charts


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