Monday, July 25, 2011

Have a safe day!

Monday, July 25
2:30 p.m.
Joint Experimental-Theoretical Physics SeminarJoint Experimental-Theoretical Physics Seminar
Speaker: Douglas Orbaker, University of Rochester
Title: Forward-Backward Asymmetry in Top Quark-Antiquark Production in Proton-Antiproton Collisions at DZero
3:30 p.m.
4 p.m.
All Experimenters' Meeting - Curia II
Special Topic: Hollow Electron-Beam Collimation Progress

Tuesday, July 26
12 p.m.
Summer Lecture Series - Curia II
Speaker: Farah Khalid, Fermilab
Title: Chips With Everything
3:30 p.m.

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

Upcoming conferences


Take Five


Extended Forecast
Weather at Fermilab

Current Security Status

Secon Level 3

Wilson Hall Cafe

Monday, July 25

- Breakfast: Croissant sandwich
- Smart cuisine: *Potato leek soup
- Monte Cristo
- BBQ chicken breast w/ stuffing
- Alfredo tortellini
- Chicken ranch wrapper
- Assorted sliced pizza
- Szechuan-style pork lo mein
*Carb-restricted alternative

Wilson Hall Cafe Menu

Chez Leon

Wednesday, July 27
- Six-cheese & bacon stuffed shells
- Garden herb salad w/ roasted shallot vinaigrette
- Fresh fruit plate

Friday, July 29
Guest Chef Mike Syphers
- Italian grill night
- Lobster avocado salad w/ garlic pretzel knots
- Grilled, brined pork chops stuffed w/ prosciutto & fontina
- Mushroom risotto
- Grilled asparagus w/ shaved parmigiano-reggiano cheese
- White chocolate toasted almond cheesecake w/ fresh raspberry coulis

Chez Leon Menu
Call x3524 to make your reservation.


Fermilab Today

Director's Corner

Result of the Week

Safety Tip of the Week

CMS Result of the Month

User University Profiles

ILC NewsLine


Fermilab Today
is online at:

Send comments and suggestions to:

Visit the Fermilab
home page

Unsubscribe from Fermilab Today


DZero announces top quark asymmetry result, questions theory

The latest result from DZero, announced Saturday at the European Physical Society conference, addresses the question of whether the top or the antitop quark is produced preferentially in the direction of the incoming proton. Figure courtesy of: Amnon Harel.

Editor’s note: A special Wine and Cheese lecture on this result will take place at 2:30 p.m. today in One West.

A new result from Fermilab’s DZero experiment was announced Saturday at the European Physical Society conference in Grenoble, France, studying the production of the top quark and its antimatter counterpart, the antitop quark, in proton-antiproton collisions. This result, called top quark forward and backward asymmetry, shows that the top quark travels more often in the direction of the incoming proton, whereas the anti-top quark follows the direction of the antiproton. This large asymmetry, which was unexpected, is consistent with a result reported earlier in the year and recently updated by Fermilab’s CDF collaboration.

The result means that there is a discrepancy between the data and a theory of the Standard Model that predicts the Tevatron detectors should see no such preference of the top and anti-op directions. Similar asymmetries observed in the production of muon and antimuon pairs about 30 years ago were a first step in the discovery of the Z boson.

When discrepancies such as this exist, it can indicate one of several things: an anomaly in the data, new physics at work or that the theories may need adjustment. In this case, DZero collaborators believe that the theory needs to be amended.

“The central value of the result is consistent with what CDF sees. The excess seems to be higher than the theory predicts. But we’ve taken our analysis one step further to give a possible interpretation of what is happening,” said Stefan Soldner-Rembold, DZero experiment co-spokesperson.

New physics is an attractive idea, explained DZero co-spokesperson Dmitri Denisov, but before you can look at that, you have to rule out other things first.

Finding that data doesn’t always fit with the prominent theory is something that physicists occasionally experience. Denisov explained that Tevatron physicists are running into this situation now because they have a larger data set, which enables them to look at more complex phenomena, which are more challenging to analyze.

In this case, DZero’s challenging analysis used 5.4 inverse femtobarns of data to measure the symmetry of how top quarks come out of collisions, either in the direction the beam of protons is moving (forward) or the direction of the antiproton beam (backward). Their result found a (19.6±6.5) percent asymmetry, similar to the (15.8±7.5) percent asymmetry CDF reported in January. The result is at a 2.4 sigma level, where a 3 sigma result is statistically relevant. CDF also announced over the weekend an update to their result using a different decay channel. The CDF collaboration’s updated result is (20.1±6.7) percent at about a 3 sigma level.

Douglas Orbaker, a DZero collaborator from the University of Rochester, will present the DZero result at a special Wine and Cheese lecture at 2:30 p.m. Monday, July 25, in One West. The talk will be available via streaming video.

Rhianna Wisniewski

From symmetry breaking

Higgs buzz at summer physics conference

Editor's note: Visit symmetry breaking for more EPS conference coverage.

Physicists could be on their way to discovering the Higgs boson, if it exists, by next year. Scientists in two experiments at the Large Hadron Collider pleasantly surprised attendees at the European Physical Society conference this afternoon by both showing small hints of what could be the prized particle in the same area.

“This is what we expect to find on the road to the Higgs,” said Gigi Rolandi, physics coordinator for the CMS experiment.

Both experiments found excesses in the 130-150 GeV mass region. But the excesses did not have enough statistical significance to count as evidence of the Higgs.

If the Higgs really is lurking in this region, it is still in reach of experiments at Fermilab’s Tevatron. Although the accelerator will shut down for good at the end of September, Fermilab’s CDF and DZero experiments will continue to collect data up until that point and to improve their analyses.

“This should give us the sensitivity to make a new statement about the 114-180 mass range,” said Rob Roser, CDF co-spokesperson.

Read more

Kathryn Grim

In the News

Higgs cornered in Grenoble

From, July 22, 2011

The latest data from experiments at the Large Hadron Collider (LHC) leave significantly less room for the Higgs boson to hide – that is the take-home message from the Europhysics Conference of High-Energy Physics in Grenoble, France.

"It's getting real!" remarked one particle physicist excitedly as delegates emerged from Friday afternoon's session of the conference, which runs until 27 July. In the space of a few presentations, the possible hiding places for the Higgs boson have been shrunk dramatically thanks to data collected this year at the LHC at CERN.

The Higgs boson is a hypothetical particle the existence of which would provide the last missing piece in the nearly 40-year-old Standard Model of particle physics. It is the simplest explanation for how the electroweak symmetry was broken in the very early universe, giving mass to elementary particles.

Read more

ES&H Tip of the Week: Quality

Myths about suspect or counterfeit items

Remember, you are the primary line of defense against S/CI, like these counterfeit watches. Photo: Gerald Nino.

Office of Quality and Best Practices (OQBP) at Fermilab has recently concluded a lab-wide assessment of suspect or counterfeit items, in accordance with Fermilab’s Suspect/Counterfeit Items Program (S/CI). In the course of this assessment, several misconceptions about the nature of S/CI risks and control methods emerged:

Myth #1: I purchase materials from reputable suppliers and don’t skimp on cost. I’m not at risk for S/CI.
  • False. Reputable suppliers experience S/CI problems. If each link in the supply chain simply trusts their suppliers without controls, a weak link will eventually allow S/CI into the products of the most reputable suppliers.
Myth #2: The Receiving Department inspects for counterfeit materials upon receipt at the lab. I don’t need to re-inspect my materials.
  • False. Receiving only verifies packing list part numbers and quantities against the purchase order. They don’t have the specific expertise or resources to inspect materials. Requestors must be knowledgeable in specific S/CI risks for purchases and establish controls accordingly.
Myth #3: I don’t purchase high-risk items like bolts, shackles or circuit breakers. My purchases aren’t subject to counterfeiting risks.
  • False. Common items such as batteries, extension cords and ink cartridges can be counterfeited.
Myth #4: Domestically-made products are not subject to counterfeiting.
  • False. S/CI materials in the supply chain can result in risks, even for U.S. production. Additionally, imported S/CI products may be labeled falsely identifying them as domestic products.
Myth #5: The products I order are certified by a third-party agency. Because of this certification, I’m assured the products aren’t counterfeit.
  • False. Counterfeit materials sometime bear counterfeit certification labeling or include falsified testing documents. Know the appropriate certification markings for your products and verify them before use.
You, as a knowledgeable purchaser, are the primary line of defense against S/CI materials. Be aware of the risks and indications of S/CI for any materials you specify or purchase and establish inspection or other controls to keep S/CI out of Fermilab.

— Kurt Mohr, QAE


Death: John Korienek

Fermilab PPD employee John Korienek, 77, passed away on Saturday, July 23.

Visitation will take place from 4 to 8 p.m. on Tuesday, July 26, at the Beidelman-Kunsch Funeral Home, 516 S. Washington St. in Naperville. The funeral service is on Wednesday, July 27, at 10 a.m., also at the Beidelman-Kunsch Funeral Home, from which attendees will depart to the Holy Sepulchre Catholic Cemetery at 6001 W. 111th St. in Worth. A luncheon and toast will honor Korienek at 2 p.m. at Naperville VFW, located at 908 Jackson Ave. in Naperville.

Read his obituary here.

Accelerator Update

July 20-22

- Three stores provided ~39.25 hours of luminosity
- Pbar LCW leak found and fixed
- LCW pumps turned off due to MI LCW leak
- MI LCW leak found and fixed
- NuMI V108 magnet/power supply cabling problem

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


SEMINAR: Emergency preparedness tips for those with functional needs - Aug. 3

English country dancing with live music - July 24

Blackthorn: Traditional Celtic band - Aug. 28

"Third Thursday" lunchtime clean-up rescheduled - July 28

Call for applications for URA Visiting Scholars Program - Deadline Aug. 19

Argentine tango each Wednesday at Fermilab's Ramsey Auditorium - through Aug. 3

Visa Office powerpoint presentation on greencards for spouses and fiancé(e)s

Windows 7 Introduction class - Aug. 9

Fermilab prairie quadrat study - July 28 and Aug. 16, 20

Employee Advisory Group wants to hear from you

Chicago Fire discount tickets

Muscle Toning - through Sept. 15

Join Fermilab's new scuba diving club

Open badminton

Fermilab management practices courses presented this summer

SciTech summer camps - through Aug. 12

Security, Privacy, Legal  |  Use of Cookies