prikaz prve stranice dokumenta First measurement of prompt and non-prompt D*+ vector meson spin alignment in pp collisions at √s=13 Tev
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Scientific paper - Original scientific paper
First measurement of prompt and non-prompt D*+ vector meson spin alignment in pp collisions at √s=13 Tev
Physics Letters B, 846 (2023); 137920. https://doi.org/10.1016/j.physletb.2023.137920
(ALICE Collaboration) Acharya, S.; ...; Erhardt, Filip; ...; Gotovac, Sven; ...; Jerčić, M.; ...; Karatović, David; ...; Lončar, Petra; ...; Planinić, Mirko; ...; Poljak, Nikola; ...; Vicković, Linda; ...; Zurlo, N. More authors...

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Acharya, S., Erhardt, F., Gotovac, S., Jerčić, M., Karatović, D., Lončar, P. ... Zurlo, N. (2023). First measurement of prompt and non-prompt D*+ vector meson spin alignment in pp collisions at √s=13 Tev. Physics Letters B, 846.. doi: 10.1016/j.physletb.2023.137920

Acharya, S., et al. "First measurement of prompt and non-prompt D*+ vector meson spin alignment in pp collisions at √s=13 Tev." Physics Letters B, vol. 846, 2023. https://doi.org/10.1016/j.physletb.2023.137920

Acharya, S., Filip Erhardt, Sven Gotovac, M. Jerčić, David Karatović, Petra Lončar, Mirko Planinić, Nikola Poljak, Linda Vicković and N. Zurlo. "First measurement of prompt and non-prompt D*+ vector meson spin alignment in pp collisions at √s=13 Tev." Physics Letters B 846 (2023). https://doi.org/10.1016/j.physletb.2023.137920

Acharya, S., et al. (2023) 'First measurement of prompt and non-prompt D*+ vector meson spin alignment in pp collisions at √s=13 Tev', Physics Letters B, 846. doi: 10.1016/j.physletb.2023.137920

Acharya S, Erhardt F, Gotovac S, Jerčić M, Karatović D, Lončar P, and sur.. First measurement of prompt and non-prompt D*+ vector meson spin alignment in pp collisions at √s=13 Tev. Physics Letters B [Internet]. 2023 November [cited 2024 July 17];846. doi: 10.1016/j.physletb.2023.137920

S. Acharya, et al., "First measurement of prompt and non-prompt D*+ vector meson spin alignment in pp collisions at √s=13 Tev", Physics Letters B, vol. 846, November 2023. [Online]. Available at: https://urn.nsk.hr/urn:nbn:hr:217:861211. [Accessed: 17 July 2024]

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Metadata
Title (english)First measurement of prompt and non-prompt D*+ vector meson spin alignment in pp collisions at √s=13 Tev
AuthorS. Acharya
Author
...
AuthorFilip Erhardt
Author
...
AuthorSven Gotovac
Author
...
AuthorM. Jerčić
Author
...
AuthorDavid Karatović
Author
...
AuthorPetra Lončar
Author
...
AuthorMirko Planinić
Author
...
AuthorNikola Poljak
Author
...
AuthorLinda Vicković
Author
...
AuthorN. Zurlo
CollaborationALICE Collaboration
Author's institutionUniversity of Zagreb
Faculty of Science
(Department of Physics)
Scientific / art field,
discipline and subdiscipline		NATURAL SCIENCES
Physics
Abstract (english)
This letter reports the first measurement of spin alignment, with respect to the helicity axis, for D∗+ vector mesons and their charge conjugates from charm-quark hadronisation (prompt) and from beautymeson decays (non-prompt) in hadron collisions. The measurements were performed at midrapidity (|y| < 0.8) as a function of transverse momentum (pT) in proton–proton (pp) collisions collected by ALICE at the centre-of-mass energy √s = 13 TeV. The diagonal spin density matrix element ρ00 of D∗+ mesons was measured from the angular distribution of the D∗+ → D0(→ K−π+)π+ decay products, in the D∗+ rest frame, with respect to the D∗+ momentum direction in the pp centre of mass frame. The ρ00 value for prompt D∗+ mesons is consistent with 1/3, which implies no spin alignment. However, for nonprompt D∗+ mesons an evidence of ρ00 larger than 1/3 is found. The measured value of the spin density element is ρ00 = 0.455±0.022(stat.)±0.035(syst.) in the 5 < pT < 20 GeV/c interval, which is consistent with a Pythia 8 Monte Carlo simulation coupled with the EvtGen package, which implements the helicity conservation in the decay of D∗+ meson from beauty mesons. In non-central heavy-ion collisions, the spin of the D∗+ mesons may be globally aligned with the direction of the initial angular momentum and magnetic field. Based on the results for pp collisions reported in this letter it is shown that alignment of non-prompt D∗+ mesons due to the helicity conservation coupled to the collective anisotropic expansion may mimic the signal of global spin alignment in heavy-ion collisions.
Keywords (english)
Languageenglish
Publication typeScientific paper - Original scientific paper
Publication statusPublished
Peer reviewPeer review - international
Publication versionPublished version
Journal titlePhysics Letters B
Numberingvol. 846, 137920
p-ISSN0370-2693
DOIhttps://doi.org/10.1016/j.physletb.2023.137920
URN:NBNurn:nbn:hr:217:861211
Publication2023-11
Document URLhttps://linkinghub.elsevier.com/retrieve/pii/S037026932300254X
Type of resourceText
Access conditionsOpen access
Terms of useLicence Attribution 4.0 International (CC BY 4.0) icon
Public note© 2023 European Organization for Nuclear Research. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP3. Received 15 December 2022. Received in revised form 6 March 2023. Accepted 14 April 2023. Available online 20 September 2023.
Created on2024-07-13 21:15:13