64,106 research outputs found
Theory on Hadrons in Nuclear Medium
After decades-long attempts to measure the mass shift and understand the
origin of hadron mass, it became clear that one has to analyze hadrons with
small vacuum width. Also, to identify the effect of chiral symmetry breaking,
one has to start by looking at chiral partners. In this talk, I will review why
such consideration inevitably led us to consider and in nuclear
matter [T. Song, T. Hatsuda, S H Lee, PLB792 (2019) 160-169]. With the kaon
beam at JPARC, one could observe the mass shift of both particles in a nuclear
target experiment. Once the masses and mass difference of and
mesons are measured, we will be closer to understanding the origin of the
hadron masses and the effects of chiral symmetry breaking in them.Comment: 8 pages, Plenary talk at QNP-201
The mass of charmonium in nuclear matter
The masses of charmonium states immersed in nuclear matter are calculated in
LO QCD and in QCD sum rules. While the mass shift for are found to be
less than -10 MeV, those for the and and
are found to be more than -40 MeV. We investigate the feasibility
of observing such mass shifts in the future accelerator project at GSI.Comment: 5 pages, proceeding for Hadron 200
Top quark mass and property measurements at Tevatron
The top quark, discovered in 1995 at the Fermilab Tevatron collider from CDF
and D0 experiments, remains by far the most interesting particle to test
standard model because of its large mass and unique properties. Having data
collected about 10 fb of integrated luminosity of collision,
both experiments have been studied the top quark in all the possible
directions. In this article, we present the recent measurements of the top
quark properties from Tevatron including the mass, width, spin correlation, and
boson helicity using signature.Comment: Presented at the 2011 Hadron Collider Physics symposium (HCP-2011),
Paris, France, November 14-18 2011, 4 pages, 6 figur
Top-Quark Mass Measurement in the Dilepton Channel Using {\it in situ} Jet Energy Scale Calibration
We employ a top-quark mass measurement technique in the dilepton channel with
{\it in situ} jet energy scale calibration. Three variables having different
jet energy scale dependences are used simultaneously to extract not only the
top-quark mass but also the energy scale of the jet from a single likelihood
fit. Monte Carlo studies with events corresponding to an integrated luminosity
of 5 fb proton-proton collisions at the Large Hadron Collider TeV are performed. Our analysis suggests that the overall jet energy scale
uncertainty can be significantly reduced and the top-quark mass can be
determined with a precision of less than 1 GeV/c, including jet energy
scale uncertainty, at the Large Hadron Collider.Comment: Submitted to Phys. Rev.
Quantum state engineering by a coherent superposition of photon subtraction and addition
We study a coherent superposition of field annihilation and creation operator
acting on continuous variable systems and propose its application for quantum
state engineering. Specifically, it is investigated how the superposed
operation transforms a classical state to a nonclassical one, together with
emerging nonclassical effects. We also propose an experimental scheme to
implement this elementary coherent operation and discuss its usefulness to
produce an arbitrary superposition of number states involving up to two
photons.Comment: published version, 7 pages, 8 figure
Quarkonium-Hadron Interactions in Perturbative QCD
The next to leading order (NLO) quarkonium-hadron cross section is calculated
in perturbative QCD. The corresponding leading order (LO) result was performed
by Peskin more than 20 years ago using the operator product expansion (OPE). In
this work, the calculation is performed using the Bethe-Salpeter amplitude and
the factorization formula. The soft divergence appearing in the intermediate
stages of the calculations are shown to vanish after adding all possible
crossed terms, while the collinear divergences are eliminated by mass
factorization. Applying the result to the Upsilon system, one finds that there
are large higher order correction near the threshold. The relevance of the
present result to the charmonium case is also discussed.Comment: Yonsei University. to be published in PR
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