Thursday, July 14, 2011

Have a safe day!

Thursday, July 14
2 p.m.
LHC Physics Center Topic of the Week Seminar - WH11 Sunrise
Speaker: Daniel Elvira, Fermilab
Title: SUSY Searches II: Elements of a Data Analysis and their Integration in a Search Result
2:30 p.m.
Theoretical Physics Seminar - Curia II
Speaker: Jan Winter, CERN
Title: Developments in ME+PS Merging
3:30 p.m.

Friday, July 15
2 p.m.
Joint Experimental-Theoretical Physics Seminar - Auditorium
Speaker: Julia Thom, Cornell University
Title: First Two Sided Limit of Bs to mu mu Decays at CDF
3:30 p.m.
4 p.m.
Joint Experimental-Theoretical Physics Seminar - One West
Speaker: Wick Haxton, University of California, Berkeley/Lawrence Berkeley National Laboratory
Title: Neutrino Physics and Astrophysics: Aspirations for the Next Decade

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Wilson Hall Cafe

Thursday, July 14

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

Wilson Hall Cafe Menu

Chez Leon

Friday, July 15
- Fresh corn blinis with smoked salmon & chive cream
- Crusty pan-seared rib eye steak
- Buttery mashed potatoes
- Vegetable of the season
- Chocolate soufflé w/ crème anglaise

Wednesday, July 20
- Yogurt marinated beef kabobs w/ wasabi aioli
- Greek chick pea salad
- Baklava

Chez Leon Menu
Call x3524 to make your reservation.


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From symmetry breaking

CDF gets first glimpse of legendary rare decay

The CDF collaboration at Fermilab got a glimpse recently of a rare decay process that scientists have searched for years. Its rate appears to be slightly larger than expected, which could indicate new physics.

The collaboration’s most recent result involves the observation of a rare decay of a Bs meson into a pair of muons. The 2.8 sigma result, which is just below the evidence threshold, is the first time scientists have seen signs of this legendary decay. CDF co-spokesperson Giovanni Punzi explained that this result is also significant because the collaboration observed more of the rare events than they expected.

When most particles decay, they frequently do so in a specific way. However, once in a while, particles can decay in an unusual way. It is in these rare instances that scientists can catch a glimpse of something that they normally wouldn’t otherwise see.

The Standard Model predicts that this decay should take place so infrequently (3.2 x 10-9), that it should take more than 350 trillion collisions before scientists have an opportunity to see it. However, with that many collisions, also quantified as 7 inverse femtobarns of data, CDF saw a handful of these events.

Read more

Rhianna Wisniewski

Photo of the Day

Illinois State Senator Daniel Biss visits Fermilab

Fermilab scientist Dave Schmitz (right) describes the MINERvA and MINOS experiments to Illinois State Senator Daniel Biss (left) on his tour at Fermilab on June 29. His visit also included stops at CDF and the Superconducting Radio Frequency Test Facility. Also pictured are (center left to right) Fermilab's Elizabeth Clements and Jamie Santucci, as well as Gabriella Elkaim, an intern in Senator Biss' office.
In Brief

Call for applications: URA Visiting Scholars Program

Universities Research Association, Inc. (URA) has announced a deadline of August 19 for the submission of applications for the fall 2011 cycle of awards in the URA Visiting Scholars Program at Fermilab. Award recipients will be notified at the end of September.

These awards provide financial support for faculty and students from URA's 86 member universities to work at Fermilab for periods of up to one year. URA makes two rounds of awards each year, in the spring and fall. The application deadline for the spring 2012 cycle is on February 17 of next year. Successful applicants will be notified at the end of March 2012.

Proposals may range from attendance at conferences or summer schools to year-long research stays. Support from this program can include transportation costs, local lodging expenses during a series of shorter visits or salary support during a longer visit. Individual awardees may receive up to a maximum of $50,000 in any 12-month period. URA has made a total of 120 awards since the beginning of 2008, including 16 awards conferred in March 2011.

The program is a corporate commitment to Fermilab made by URA under the FRA contract with the Department of Energy. The 86 URA-member universities each contribute $5,000 a year for five years in support of joint Fermilab-URA research and education initiatives.

For details on the URA Visiting Scholars at Fermilab Program, including eligibility, application procedure, award administration and names of award recipients, visit the URA Visiting Scholars website.

In the News

Dark energy modeled by supercomputer

From The Epoch Times July 12, 2011

Researchers from Ohio State University (OSU) are using a supercomputer to characterize and simplify dark energy—the cryptic force causing the ever-accelerating expansion of the universe.

Led by physicist Chris Orban, a team of experts are creating a dark matter clustering feature using Ohio Supercomputer Center (OSC) systems. This model will provide insights into dark energy's behavior.

"Knowing how the dark matter 'reacts' to the expansion of the universe is crucial for learning the most about dark energy and dark matter from large astronomical surveys like the Sloan Digital Sky Survey, of which OSU is a collaborating member," said Orban in a press release.

Read more

In the News

Neutrinos and antineutrinos might "disappear" differently

From American Physical Society's Physics Central Buzz Blog, July 11, 2011

Scientists working on the MINOS experiment at Fermilab say they may have detected for the first time a difference in the way muon neutrinos and antineutrinos disappear. If they're right, it could change particle physics as we know it.

A fundamental of the standard model of particle physics called "CPT symmetry" requires that the way a particle and its antiparticle disappears be the same. The MINOS experiment has shown that this may not be the case.

When a neutrino or antineutrino disappears, it doesn't actually go away. Instead, it changes flavors. This change is known as an oscillation. MINOS studied the oscillations of both neutrinos and antineutrinos and found that they were different.

Read more

Result of the Week

A different kind of Higgs boson

The history of particle physics is replete with silly names and this subject is no different. One of the original names for a model which predicted doubly charged Higgs bosons was the Mini Moose Model.

Perhaps the most pressing topic in modern particle physics is the exploration of the energy realm called the TeV, or teraelectronvolt. One TeV is equal to a trillion electron volts and is the energy scale of the Tevatron (and the source of the accelerator’s name). This is the energy regime in which the weak force and the electromagnetic force become unified.

Our research over the past quarter century leads us to believe that there is a big discovery just around the corner. Currently, the two most popular ideas are the Higgs boson and supersymmetry. The Higgs boson is a proposal to explain the mass of particles. Supersymmetry suggests that we treat matter particles and force-carrying particles on equal footing. No one has yet demonstrated whether either idea is true.

Physicists can mathematically unify the electromagnetic and weak forces at the TeV energy scale, but the process to break that unification remains unknown. We know that it can be done using the proposed, but unverified, Higgs mechanism, which is thought to appear at the energy level of approximately 1 TeV.

Given the mystery that surrounds the TeV scale, it is inevitable that some theoretical physicists have combined these two ideas, yielding supersymmetric Higgs bosons. In these combined models, there is more than just the one Higgs boson. In the simplest supersymmetric model, there are five Higgs bosons, including some with electrical charge. This is in contrast to the Standard Model Higgs boson, which is electrically neutral.

There are many different ways in which scientists add supersymmetry to our current theories. Each combination has different consequences for Higgs theory. Some of these theories even predict new Higgs bosons with a lot of electrical charge. Many theories make this prediction, including ones that do not involve supersymmetry, so physicists do a generic search for such particles. If such a particle is observed, physicists will deduce which theory was right.

DZero physicists searched for a Higgs boson with twice of the electrical charge of a proton (called H++). This particle would be produced in association with its partner
(H- -). Both particles would decay into muon or tau leptons. This is a challenging analysis, resulting in only a handful of candidates—even using nearly the entire DZero dataset. While DZero physicists did not observe any evidence for these exotic, highly-charged, Higgs bosons, they did rule out a bigger range of possible masses than was previously achieved.

Don Lincoln

These physicists from the University of Manchester (UK) performed this very delicate analysis.
These physicists play a central role in DZero tau lepton identification, which was critical to this analysis.
Accelerator Update

July 11-13

- Two stores provided ~15.25 hours of luminosity
- Lightning strikes caused equipment problems
- Water technicians worked on Tevatron heat exchangers
- Store 8880 intentionally aborted due to Tevatron E3 wet engine loosing its belt
- E3 wet engine needed complete overhaul
- MI-12 service building suffered from temperature problems
- MTA conducted first test of beam through its RF cell filled with nitrogen
- EE support personnel worked on the MI Lambertson power supply
- Meson MTest experiment T-1015 completed run at Fermilab
- Run coordinator allowed MI access to search for LCW leak

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


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