Meeting The Division of Particles and Fields of The American Physical Society
The Ohio State University played host to the American Physical Society's meeting of the Division of Particles and Fields, DPF2000, this summer. The meeting, on August 9-12, 2000, drew several hundred of the top physicists in the country from the best universities and laboratories to the campus to discuss the latest research and theories into the basic structure of matter. Nineteen members of Ohio State's physics faculty were active in planning different facets of the meeting.
Topics included the latest results from the highest energy accelerators such as the discovery of the tau neutrino at Fermilab in Batavia, Ill. Other conference sessions offered researchers the latest informa-tion from the immense neutrino detector Super-Kamiokande in Kamioka, Japan, andthe most recent balloon data on the structureof the universe. This four-day conference was organized by Ohio State physics faculty Stuart Raby andSteve Pinske, with help from Ohio State’s Department of Conferences and Institutes. The week was highlighted by the free public talk given by Dr. Brian Greene, renowned physicist and author of thepopular book The Elegant Universe. (More about Dr. Greene’s talk can be found below.) Ohio State Home to the APS Division of Particles andFields 2000 Meeting.
Dr. Brian Greene wowed ‘em at DPF 2000 .On a warm Friday
night in August—in competition with the Ohio State Fair and other summer
activities—1,500 people converged onMershon Auditorium to hear a free talk
by renowned physicist andColumbia University professor Dr. Brian Greene, part
of the DPF 2000.Green discussed “Space and Time Since Einstein,” using
animated, colorfulcomputer graphics to explain complicated concepts from the
theory of relativity to the new string theory. Called “the new Carl Sagan”
by some, and recently featured in Newsweek, on television, and in the movies,
Greene proved that people are interested in knowing more about concepts that
fascinate physicists every day.Greene’s book The Elegant Universe was a
finalist for the Pulitzer Prize in General Nonfiction. Following his talk, more
than 100 stood patiently in line while he chatted briefly and signed copies
of his book.D P F 2 0 0 0Peter McLarnan (center), 13,a fourth-generation Buckeyefan,
waits in line with his father,Tim, at Greene’s book signing.Brian Greene
signed copies of his book for more than 100 people who waited patiently after
his talk.
Introductions matter:An excerpt by Professor Stuart RabyDr. Stuart Raby, a friend
of Greene’s and the Ohio State connection that brought Greene to campus,
offered an introduction that included an explanation of current research for
the layaudience in attendance. An excerpt follows:On behalf of the organizing
committee for DPF 2000 and theDepartment of Physics of The Ohio State University,
I would like towelcome all of you to this public lecture.I know that some of
you have seen Dr.Greene before on TV. He appeared on TheCharlie Rose Show, The
News Hour with JimLehrer, The Century with Peter Jennings, aCNN profile with
Jeff Greenfield, an hourspecial on Nightline in Primetime, and theConan O’Brien
Show. You may have seenhim in the movie Frequency where he playedhimself and
expressed some of the ideas hewill talk about tonight. Some of you haveeven
read his book The Elegant Universewhich has been on the N.Y. Times bestsellerlist
for four months. However, most of you,if not all of you, are simply here because
ofan overwhelming curiosity about natureand the world aroundyou. And you are
hopingthis talk tonight mightgive you some insightinto the deep questionsyou
have. Well, you areamong friends. If youlook around you, you willfind here in
the audiencemore than 400 physicists,representing 14 countries from around the
world.They are here attending aconference on elementaryparticle physics under
the auspices of the American Physical Society. They al lhave a deep desire to
understand the worldaround them and the focus of their researchis the most elementary
particles of nature and the interactions of these particles;together these are
regarded as “the building blocks of nature.”One mode of research in
this field uses high-energy accelerators as microscopesfocusing on the shortest
distances.In March 2001, a high-energy accelera-tor, the “Tevatron,”
will begin operating atthe Fermi National Laboratory—Fermilab.For a few
short years, it will be the highest energy machine in the world . . . With this
machine physicists will be searching for theHiggs particle—what Nobel Laureate
Leon Lederman called the “God Particle.”Accelerators are not the only
tools usedto study elementary particles. In fact, someof the most exciting new
results are comingfrom underground laboratories. For example, approximately
one kilometerbelow the surface in Kamioka, Japan, there sits a tank holding
50,000 tons of purifiedwater, surrounded by sensitive detectors oflight. This
detector is known as Super-Kamiokande. This immense instrument isused to detect
one of the most etherealparticles of nature known as the neutrino.The neutrino
is so weakly interacting that itcan pass through astronomical distances of matter
without ever hitting anything. Yet,so many of these neutrinos are produced inthe
processes that heat the sun, that by theirinteractions in the waters of Super-Kamiokande
we are now able to “see” thesun by the neutrinos alone. Recently this
experiment has proven that neutrinos have mass. This is extremely exciting,
since it isthe first evidence for new phenomena thatcannot be described by the
standard theory of particle physics.It is believed that in addition to the Higgs,
much more new and exciting phenomena will be discovered when theTevatron and
other high-energy accelerators begin operations.In 2005, the accelerator called
the LHC at the European physics laboratory called CERN in Geneva, Switzerland,
will take over the title of the highest energy machine in the world. And it
will retain this title forthe foreseeable future.By the way, the acronym CERN
standsfor the Center for European Research Nucleare; however, it is now known
as the European Laboratory for Particle Physics—(h)ELPP. This is no joke,
as we can say that we do need help, since Congress keeps cutting funds for this
kind of research.Did you know that research scientists at CERN created the World
Wide Web as atool for scientists within large experimental groups to communicate
with one another?Did you know that the detector technologyused in the study
of elementary particles isnow being adapted to medical research anddiagnostics
for X-rays, MRIs, and CTscans? Moreover, accelerator technology used to probe
the shortest distances hasbeen used for cancer therapy as well asbiological
and chemical research.The high-energy machines at Fermilaband CERN are built
as discovery machines,built to find what is predicted by theories—or to
find what was not yet dreamed of. But keep in mind that the byproducts of thisresearch
benefit the mind, the soul, and even the economy.
Giuseppe Della Ricca
Title: Preliminary Measurements of the Quark-AntiQuark Production Cross-Section
in e+e- Annihilations up to LEP2 Highest Energies
Abstract: Data collected with the DELPHI detector at sqrt(s) up to LEP2 highest
energies (i.e. exceeding 205 GeV) have been used to extract preliminary values
of the cross-sections for quark-antiquark pair-production in e+e- annihilations.
The values found were used to test the Standard Model predictions and to seek
for physics beyond it.
talk (ps.gz)
Enrico Graziani
Title: Four Fermions Production in Neutral Current Mediated Processes with the
DELPHI at LEP
Martijn Mulders
Title: Measurement of the W Mass and Width in DELPHI at LEP
Abstract: A measurement of the W mass and W width has been performed by the
DELPHI collaboration. During the years 1997-1999 DELPHI collected data with
an integrated luminosity of 435 pb-1 at centre of mass energies ranging from
183 to 202 GeV. LEP is currently running at energies higher than 202 GeV. The
DELPHI results and preliminary numbers presented at ICHEP 2000, Osaka, are discussed
and an overview is given of improvements in statistical sensitivity and determination
of systematic errors to be expected for the final analysis of the total LEP2
data sample.
talk (ps.gz)
Thomas Alderweireld
Title: Search for charginos and neutralinos with the DELPHI detector at LEP200
Abstract: An update of the searches for charginos and neutrlinos is presented,
based on the data collected by DELPHI, at centre-of-mass energies above 192
GeV. Lower limits on the chargino mass are derived. The (mu,M2) MSSM domain
excluded by combining the chargino searches with neutralino searches is used
to set a lower limit on the mass of the lightest neutralino for high m0 and
tan(beta) ge 1. Upper limits on the neutralino production cross section times
branching fraction are derived. A limit on the chargino mass independent of
the difference of mass between the chargino and neutralino is presented for
high m0 and tan(beta) ge 1.
talk (ps.gz)
Please note that some transparencies from the LSP search people and the Nearly
degenerate chargino analysis are missing: they will be added as soon as possible.
Anette Behrmann
Title: Measurements and Interpretation of Lepton-Pair Production at LEP2 energies
Abstract: A preliminary analysis of the lepton-pair production in e+e- annihilations
at LEP2 center-of-mass energies using the data collected between 130 GeV and
LEP2 highest energies (i.e. exceeding 205 GeV) with the DELPHI detector is presented.
Leptonic cross-sections and forward-backward asymmetries are evaluated for two
ranges of effective invariant mass sqrt(s'). The first range of sqrt(s') includes
radiative return events to the Z0, whereas the second range is a subset which
contains the non-radiative events with a sqrt(s') close to sqrt(s). The values
obtained are used to test the Standard Model predictions and to derive limits
on possible new physics phenomena beyond it.
talk (ps.gz)
Patrice Verdier
Title: Gluino search from stop decay
Guillelmo Gomez Ceballos
Title: Search for charged Higgs bosons in e+e- collisons at LEPII in the DELPHI
experiment
Guillelmo Gomez Ceballos
Title: A Study of the Lorentz Structurein Tau Decays at the DELPHI Experiment
Fabio Cossutti
Title: Measurement of the W-Pair Production Cross-Section and W Branching Ratios
with the DELPHI Detector
Theodora Papadopoulos
Title: Single sparticle and Leptoquark production in e+e- collisions up to sqrt(s)=202
GeV with the DELPHI detector
Marcel Stanitzki
Title: Searches for MSSM Higgs bosons with the DELPHI detector up to sqrt(s)=209
GeV
talk (ps.gz)
Gareth Hughes
Title: Slepton Searches in the MSSM
Wolfgang Liebig
Title: Measurement of the Cross Section Ratios and Forward-Backward Asymmetries
of Flavour Tagged Events with DELPHI Detector at LEP2
Abstract: Preliminary results of the cross-section ratio R_f=sigma_ffbar/sigma_had
and the forward-backward asymmetry A^f_fb will be presented for heavy flavours
produced in the reaction e+e-->Z/gamma*->ffbar and measured with the DELPHI
detector, at LEP collision energies ranging from 183 GeV up to 202 GeV and possibly
higher. Lifetime and secondary vertex information provided by DELPHI's 3-layer
microvertex detector are the main ingredients of a tagging variable which is
used to separate the quark flavours. High purity selections are made from which
R_f and A^f_fb are measured. The compatibility of the results with the Standard
Model expectations is evaluated.
talk (ps.gz)
Bernardo Tome
Title: Searches for Exotic Particles in e+e- Collisons with the DELPHI Detector
Dimitris Fassouliotis
Title: Charged TGC from 1999 Data
Marco Paganoni
Title: Measurement of the Forward-Backward Asymmetry of b and c Quarks at the
Z Peak
Enrico Piotto
Title: Search for Sgoldstino in e+e- Collisions at sqrt(s) from 189 to 202 GeV
by the DELPHI Experiment
Andre Sopczak
Title: Limits on Higgs Boson Masses and tan(beta) from a MSSM parameter scan
at sqrt(s) <= 189 GeV
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