Direct observation of the dead-cone effect in quantum chromodynamics
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F22%3A00558284" target="_blank" >RIV/68378271:_____/22:00558284 - isvavai.cz</a>
Alternative codes found
RIV/61389005:_____/22:00558284 RIV/68407700:21340/22:00363955
Result on the web
<a href="https://doi.org/10.1038/s41586-022-04572-w" target="_blank" >https://doi.org/10.1038/s41586-022-04572-w</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1038/s41586-022-04572-w" target="_blank" >10.1038/s41586-022-04572-w</a>
Alternative languages
Result language
angličtina
Original language name
Direct observation of the dead-cone effect in quantum chromodynamics
Original language description
In particle collider experiments, elementary particle interactions with large momentum transfer produce quarks and gluons (known as partons) whose evolution is governed by the strong force, as described by the theory of quantum chromodynamics (QCD)(1). These partons subsequently emit further partons in a process that can be described as a parton shower(2), which culminates in the formation of detectable hadrons. Studying the pattern of the parton shower is one of the key experimental tools for testing QCD. This pattern is expected to depend on the mass of the initiating parton, through a phenomenon known as the dead-cone effect, which predicts a suppression of the gluon spectrum emitted by a heavy quark of mass m(Q) and energy E, within a cone of angular size m(Q)/E around the emitter(3). Previously, a direct observation of the dead-cone effect in QCD had not been possible, owing to the challenge of reconstructing the cascading quarks and gluons from the experimentally accessible hadrons. We report the direct observation of the QCD dead cone by using new iterative declustering techniques(4,5) to reconstruct the parton shower of charm quarks. This result confirms a fundamental feature of QCD. Furthermore, the measurement of a dead-cone angle constitutes a direct experimental observation of the non-zero mass of the charm quark, which is a fundamental constant in the standard model of particle physics.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10303 - Particles and field physics
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Nature
ISSN
0028-0836
e-ISSN
1476-4687
Volume of the periodical
605
Issue of the periodical within the volume
7910
Country of publishing house
DE - GERMANY
Number of pages
9
Pages from-to
440-446
UT code for WoS article
000797641900017
EID of the result in the Scopus database
2-s2.0-85130231262