How is the Higgs mass related to the mass of top quark?

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Youngsub Yoon - 16 Dec 2004 08:29 GMT

I read the following article.

"New Estimate for the Mass of Higgs Boson"
http://www.universetoday.com/am/publish/new_estimate_mass_higgs_boson.html?962004

In the article, it says the following:
"Since the top quark mass we are reporting is a bit higher than
previously measured, it means the most likely value of the Higgs mass
is also higher,"

Could somebody explain about this to me? Isn't the vacuum expectation
value of Higgs field the only value related to the mass of particles,
not the Higgs mass? And are there any specific reasons why they only
consider the mass of top quark, but not the mass of the other quarks?

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Chris Dams - 16 Dec 2004 10:22 GMT

Dear Youngsub,

>I read the following article.

>"New Estimate for the Mass of Higgs Boson"
>http://www.universetoday.com/am/publish/new_estimate_mass_higgs_boson.html?962004

>In the article, it says the following:
>"Since the top quark mass we are reporting is a bit higher than
>previously measured, it means the most likely value of the Higgs mass
>is also higher,"

>Could somebody explain about this to me? Isn't the vacuum expectation
>value of Higgs field the only value related to the mass of particles,
>not the Higgs mass? And are there any specific reasons why they only
>consider the mass of top quark, but not the mass of the other quarks?

The problem is that the Higgs mass is at the moment determined in an
indirect way. The cross sections that are compared to experiment contain
numerous parameters, among others the masses of top quark and Higgs boson.
The dependence on the Higgs mass turns out to be logaritmic. Therefore the
cross sections are not very sensitive to it. The consequence is that if
the mass of the top quark is changed a little, the Higgs mass is changed
by quite a bit.

The hope is that if the energy is increased, the Higgs will show up in
a more direct way, namely as a peak at a certain energy, corresponding
to its mass.

Best wishes,
Chris

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maporat@012.net.il - 16 Dec 2004 13:13 GMT

only in your dreams!
it is a stoopid wast of time and huge resoursces.
a nonstarter fo r one who has the smallest physics common sense.
------------------
Y.Porat
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Natural Science Forum / Physics / Particle Physics / December 2004

How is the Higgs mass related to the mass of top quark?