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Direct observation of the dead-cone effect in quantum chromodynamics. / ALICE Collaboration.

In: Nature, Vol. 605, No. 7910, 18.05.2022, p. 440-446.

Research output: Contribution to journal › Article › peer-review

Harvard

ALICE Collaboration 2022, 'Direct observation of the dead-cone effect in quantum chromodynamics', Nature, vol. 605, no. 7910, pp. 440-446. https://doi.org/10.1038/s41586-022-04572-w

APA

ALICE Collaboration (2022). Direct observation of the dead-cone effect in quantum chromodynamics. Nature, 605(7910), 440-446. https://doi.org/10.1038/s41586-022-04572-w

Vancouver

ALICE Collaboration. Direct observation of the dead-cone effect in quantum chromodynamics. Nature. 2022 May 18;605(7910):440-446. https://doi.org/10.1038/s41586-022-04572-w

Author

ALICE Collaboration. / Direct observation of the dead-cone effect in quantum chromodynamics. In: Nature. 2022 ; Vol. 605, No. 7910. pp. 440-446.

BibTeX

@article{0bdab68cc7c145f693595d4666cbf1f7,
title = "Direct observation of the dead-cone effect in quantum chromodynamics",
abstract = "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 shower2, 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 mQ and energy E, within a cone of angular size mQ/E around the emitter3. 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 techniques4,5 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.",
author = "{ALICE Collaboration} and S. Acharya and D. Adamova and A. Adler and J. Adolfsson and {Aglieri Rinella}, G. and M. Agnello and N. Agrawal and Z. Ahammed and S. Ahmad and Ahn, {S. U.} and I. Ahuja and Z. Akbar and A. Akindinov and M. Al-Turany and Alam, {S. N.} and D. Aleksandrov and B. Alessandro and Alfanda, {H. M.} and {Alfaro Molina}, R. and B. Ali and Y. Ali and A. Alici and N. Alizadehvandchali and A. Alkin and J. Alme and T. Alt and L. Altenkamper and I. Altsybeev and Anaam, {M. N.} and C. Andrei and D. Andreou and A. Andronic and M. Angeletti and V. Anguelov and F. Antinori and P. Antonioli and C. Anuj and N. Apadula and L. Aphecetche and H. Appelshauser and S. Arcelli and S. Belokurova and A. Erokhin and G. Feofilov and V. Kovalenko and T. Lazareva and D. Nesterov and V. Vechernin and A. Zarochentsev and V. Zherebchevskii",
note = "Publisher Copyright: {\textcopyright} 2022, The Author(s).",
year = "2022",
month = may,
day = "18",
doi = "10.1038/s41586-022-04572-w",
language = "English",
volume = "605",
pages = "440--446",
journal = "Nature",
issn = "0028-0836",
publisher = "Nature Publishing Group",
number = "7910",

}

RIS

TY - JOUR

T1 - Direct observation of the dead-cone effect in quantum chromodynamics

AU - ALICE Collaboration

AU - Acharya, S.

AU - Adamova, D.

AU - Adler, A.

AU - Adolfsson, J.

AU - Aglieri Rinella, G.

AU - Agnello, M.

AU - Agrawal, N.

AU - Ahammed, Z.

AU - Ahmad, S.

AU - Ahn, S. U.

AU - Ahuja, I.

AU - Akbar, Z.

AU - Akindinov, A.

AU - Al-Turany, M.

AU - Alam, S. N.

AU - Aleksandrov, D.

AU - Alessandro, B.

AU - Alfanda, H. M.

AU - Alfaro Molina, R.

AU - Ali, B.

AU - Ali, Y.

AU - Alici, A.

AU - Alizadehvandchali, N.

AU - Alkin, A.

AU - Alme, J.

AU - Alt, T.

AU - Altenkamper, L.

AU - Altsybeev, I.

AU - Anaam, M. N.

AU - Andrei, C.

AU - Andreou, D.

AU - Andronic, A.

AU - Angeletti, M.

AU - Anguelov, V.

AU - Antinori, F.

AU - Antonioli, P.

AU - Anuj, C.

AU - Apadula, N.

AU - Aphecetche, L.

AU - Appelshauser, H.

AU - Arcelli, S.

AU - Belokurova, S.

AU - Erokhin, A.

AU - Feofilov, G.

AU - Kovalenko, V.

AU - Lazareva, T.

AU - Nesterov, D.

AU - Vechernin, V.

AU - Zarochentsev, A.

AU - Zherebchevskii, V.

N1 - Publisher Copyright: © 2022, The Author(s).

PY - 2022/5/18

Y1 - 2022/5/18

N2 - 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 shower2, 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 mQ and energy E, within a cone of angular size mQ/E around the emitter3. 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 techniques4,5 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.

AB - 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 shower2, 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 mQ and energy E, within a cone of angular size mQ/E around the emitter3. 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 techniques4,5 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.

UR - http://www.scopus.com/inward/record.url?scp=85130231262&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/411021cc-4923-310c-8c08-574a8c3ec517/

U2 - 10.1038/s41586-022-04572-w

DO - 10.1038/s41586-022-04572-w

M3 - Article

C2 - 35585340

AN - SCOPUS:85130231262

VL - 605

SP - 440

EP - 446

JO - Nature

JF - Nature

SN - 0028-0836

IS - 7910

ER -

ID: 97291472