Search for new heavy techniparticles Page: 2 of 6
6 pagesView a full description of this article.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
SEARCH FOR NEW HEAVY TECHNIPARTICLES
C. Baltay
Columbia University, New York, NY 10027
H. Gordon
Brookhaven National Laboratory, Upton, NY 11973
IntroductionTesting the standard model, as has been
extensively discussed at this summer study,
is clearly one of the most important goals
of particle physics research in the next few
years. However, it is also clear that even
_f all the tests prove to be satisfied, the
standard model in itself cannot be a complete
theory because it does not explain the masses
of the various particles. A new class of
particles, the Higgs particles, are needed
for this purpose. There has been intense
theoretical activity recently concerning
these particles, i.e. the origin of the
masses in the observed particle spectrum;
technicolor and suoersymmetry are among the
most favored current ideas. Both of these
models predict the existence of new classes
of particles with a characteristic mass
scale of around a TeV (+ ?). However, some
of the expected particles are much lighter
than a TeV, just as the Tr-meson is much
lighter than the typical one GeV mass scale
of the presently seen hadrons. Some of the
predictions are summarized in Table I. Some
of these lighter particles, in the 100 to 300
GeV mass range, are beyond the masses that
can be produced by a~e- colliders in the
foreseeable future. Thus hadron-hadron
colliders with total center of mass energies
of the order of one to several TeV will play
an important role in the search for these
new particles.
In this article, we consider in some
detail an experiment to search for a typical
member of this new zoology, the Teconieta
(rT), which is expected to be in the 100 to
300 GeV mass range. For the sake of concrete-
ness we use the predictions of the techni-
color models; however, it might be better to
t:i:nk of these donsiderations as an example
of the kind of searches that should be carried
out with the next generation of hadron-hadron
colliders, without putting too much impcrtance
on the details of the theoretical models that
nappen to be in fashion a: this time. The
general notion of a .- TeV mass scale and the
rough value of the coupling strengths of the
new mass scale to the present quarks, leptons,
and gluons seem more reliable than details
of the particular models.
Production Cross Sections and Rates
The dominant production mechanism for
the Tecnnieta seems to be the collision of
two gluons from inside the colliding protons
AdTable I
1. Higgs
Ho standard Model Higgs
I a* More complicated Higgs
2. Supersymmtry
: 9. 2, H
like r. , a. v, etc.
q like ~. d, t. etc.
3. Technicolor
(00) + Technipions pt, Po, poTechnidileptons
(1L)3, (5)3 Technileptoquarks
(05) Technieta
(00)6 * Technidiquarks
(00X) Tachnthadrens p, , WT
4. composite Leptons and Quarks5-40 GeV
~ 70 GeV
- 150 GeV
- 200 Gev
- 150 ceV
-1 TeVq
The cross section for this process has
been estimated by Kane and Rebbi; by Grardi,
Mery, and Sorba; and by J. Leveille; and by
F. Paige at tnis summer study. Their results
are in good agreement. The cross sections as
a function of n mass are shown in Fig. I for
hadron-hadron colliders with total center of
mass energies /s = 0.8 and 2.0 TeV. Note
that the cross sections for these gluon-gluon
induced processes are expected to be the
same for pp and pp collisions.
To calculate production rates, we use
107 seconds for the total datataking time
and use luminosities of vL = 1033 cm-2sec-l
for the /s = 0.8 TeV collider and _ = 1030
cm-2sec-l for the /s = 2 TeV collider. The
results are shown in Fig. 2. We are
encouraged by the very nign rates of 103 to
106 total technietas produced in these
examples.OG 664
ome _eoretica 9e, P~uea. .---.
s Th li
(LL)I
Upcoming Pages
Here’s what’s next.
Search Inside
This article can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Article.
Baltay, C. & Gordon, H. Search for new heavy techniparticles, article, January 1, 1982; New York. (https://digital.library.unt.edu/ark:/67531/metadc1212184/m1/2/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.