---
_id: '14753'
abstract:
- lang: eng
text: "Several fixed-target experiments reported J/ψ and ϒ polarizations, as functions
of Feynman x (xF) and transverse momentum (PT), in three different frames, using
different combinations of beam particles, target nuclei, and collision energies.
Despite the diverse and heterogeneous picture formed by these measurements, a
detailed look allows us to discern qualitative physical patterns that inspire
a simple empirical model. This data-driven scenario offers a good quantitative
description of the J/ψ and ϒ(1S) polarizations measured in proton- and pion-nucleus
collisions, in the xF 0.5 domain: more than 80 data points (not statistically
independent) are well reproduced with only one free parameter. This study sets
the context for future low-PT\r\n quarkonium polarization measurements in proton-
and pion-nucleus collisions, such as those to be made by the AMBER experiment,
and shows that such measurements provide significant constraints on the poorly-known
parton distribution functions of the pion."
acknowledgement: "P.F. and C.L. acknowledge support from Fundação para a Ciência e
a Tecnologia, Portugal, under contract CERN/FIS-PAR/0010/2019.\r\nOpen Access funded
by SCOAP3."
article_number: '137871'
article_processing_charge: Yes (via OA deal)
article_type: original
author:
- first_name: Pietro
full_name: Faccioli, Pietro
last_name: Faccioli
- first_name: Ilse
full_name: Krätschmer, Ilse
id: 30d4014e-7753-11eb-b44b-db6d61112e73
last_name: Krätschmer
orcid: 0000-0002-5636-9259
- first_name: Carlos
full_name: Lourenço, Carlos
last_name: Lourenço
citation:
ama: 'Faccioli P, Krätschmer I, Lourenço C. Low-pT quarkonium polarization measurements:
Challenges and opportunities. Physics Letters B. 2023;840. doi:10.1016/j.physletb.2023.137871'
apa: 'Faccioli, P., Krätschmer, I., & Lourenço, C. (2023). Low-pT quarkonium
polarization measurements: Challenges and opportunities. Physics Letters B.
Elsevier. https://doi.org/10.1016/j.physletb.2023.137871'
chicago: 'Faccioli, Pietro, Ilse Krätschmer, and Carlos Lourenço. “Low-PT Quarkonium
Polarization Measurements: Challenges and Opportunities.” Physics Letters B.
Elsevier, 2023. https://doi.org/10.1016/j.physletb.2023.137871.'
ieee: 'P. Faccioli, I. Krätschmer, and C. Lourenço, “Low-pT quarkonium polarization
measurements: Challenges and opportunities,” Physics Letters B, vol. 840.
Elsevier, 2023.'
ista: 'Faccioli P, Krätschmer I, Lourenço C. 2023. Low-pT quarkonium polarization
measurements: Challenges and opportunities. Physics Letters B. 840, 137871.'
mla: 'Faccioli, Pietro, et al. “Low-PT Quarkonium Polarization Measurements: Challenges
and Opportunities.” Physics Letters B, vol. 840, 137871, Elsevier, 2023,
doi:10.1016/j.physletb.2023.137871.'
short: P. Faccioli, I. Krätschmer, C. Lourenço, Physics Letters B 840 (2023).
date_created: 2024-01-08T13:09:17Z
date_published: 2023-05-10T00:00:00Z
date_updated: 2024-01-09T09:02:22Z
day: '10'
ddc:
- '530'
department:
- _id: MaRo
doi: 10.1016/j.physletb.2023.137871
file:
- access_level: open_access
checksum: 02dec160dbc81d95985e755869d8afbf
content_type: application/pdf
creator: dernst
date_created: 2024-01-09T08:59:24Z
date_updated: 2024-01-09T08:59:24Z
file_id: '14762'
file_name: 2023_PhysicsLettersB_Faccioli.pdf
file_size: 855494
relation: main_file
success: 1
file_date_updated: 2024-01-09T08:59:24Z
has_accepted_license: '1'
intvolume: ' 840'
keyword:
- Nuclear and High Energy Physics
language:
- iso: eng
month: '05'
oa: 1
oa_version: Published Version
publication: Physics Letters B
publication_identifier:
eissn:
- 1873-2445
issn:
- 0370-2693
publication_status: published
publisher: Elsevier
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Low-pT quarkonium polarization measurements: Challenges and opportunities'
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 840
year: '2023'
...
---
_id: '6955'
abstract:
- lang: eng
text: We study few-body bound states of charged particles subject to attractive
zero-range/short-range plus repulsive Coulomb interparticle forces. The characteristic
length scales of the system at zero energy are set by the Coulomb length scale
D and the Coulomb-modified effective range r eff. We study shallow bound states
of charged particles with D >> r eff and show that these systems obey universal
scaling laws different from neutral particles. An accurate description of these
states requires both the Coulomb-modified scattering length and the effective
range unless the Coulomb interaction is very weak (D -> ). Our findings are relevant
for bound states whose spatial extent is significantly larger than the range of
the attractive potential. These states enjoy universality – their character is
independent of the shape of the short-range potential.
article_number: '135016'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: C.H.
full_name: Schmickler, C.H.
last_name: Schmickler
- first_name: H.-W.
full_name: Hammer, H.-W.
last_name: Hammer
- first_name: Artem
full_name: Volosniev, Artem
id: 37D278BC-F248-11E8-B48F-1D18A9856A87
last_name: Volosniev
orcid: 0000-0003-0393-5525
citation:
ama: Schmickler CH, Hammer H-W, Volosniev A. Universal physics of bound states of
a few charged particles. Physics Letters B. 2019;798. doi:10.1016/j.physletb.2019.135016
apa: Schmickler, C. H., Hammer, H.-W., & Volosniev, A. (2019). Universal physics
of bound states of a few charged particles. Physics Letters B. Elsevier.
https://doi.org/10.1016/j.physletb.2019.135016
chicago: Schmickler, C.H., H.-W. Hammer, and Artem Volosniev. “Universal Physics
of Bound States of a Few Charged Particles.” Physics Letters B. Elsevier,
2019. https://doi.org/10.1016/j.physletb.2019.135016.
ieee: C. H. Schmickler, H.-W. Hammer, and A. Volosniev, “Universal physics of bound
states of a few charged particles,” Physics Letters B, vol. 798. Elsevier,
2019.
ista: Schmickler CH, Hammer H-W, Volosniev A. 2019. Universal physics of bound states
of a few charged particles. Physics Letters B. 798, 135016.
mla: Schmickler, C. H., et al. “Universal Physics of Bound States of a Few Charged
Particles.” Physics Letters B, vol. 798, 135016, Elsevier, 2019, doi:10.1016/j.physletb.2019.135016.
short: C.H. Schmickler, H.-W. Hammer, A. Volosniev, Physics Letters B 798 (2019).
date_created: 2019-10-18T18:33:32Z
date_published: 2019-11-10T00:00:00Z
date_updated: 2023-08-30T07:06:42Z
day: '10'
ddc:
- '530'
department:
- _id: MiLe
doi: 10.1016/j.physletb.2019.135016
external_id:
arxiv:
- '1904.00913'
isi:
- '000494939000086'
file:
- access_level: open_access
checksum: d27f983b34ea7dafdf356afbf9472fbf
content_type: application/pdf
creator: dernst
date_created: 2019-10-25T12:47:04Z
date_updated: 2020-07-14T12:47:46Z
file_id: '6974'
file_name: 2019_PhysicsLettersB_Schmickler.pdf
file_size: 528362
relation: main_file
file_date_updated: 2020-07-14T12:47:46Z
has_accepted_license: '1'
intvolume: ' 798'
isi: 1
language:
- iso: eng
month: '11'
oa: 1
oa_version: Published Version
publication: Physics Letters B
publication_identifier:
issn:
- 0370-2693
publication_status: published
publisher: Elsevier
quality_controlled: '1'
scopus_import: '1'
status: public
title: Universal physics of bound states of a few charged particles
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 798
year: '2019'
...
---
_id: '1453'
abstract:
- lang: eng
text: In this Letter we exhibit a one-parameter family of new Taub-NUT instantons
parameterized by a half-line. The endpoint of the half-line will be the reducible
Yang-Mills instanton corresponding to the Eguchi-Hanson-Gibbons L2 harmonic 2-form,
while at an inner point we recover the Pope-Yuille instanton constructed as a
projection of the Levi-Civitá connection onto the positive su(2)+ ⊂ so(4) subalgebra.
Our method imitates the Jackiw-Nohl-Rebbi construction originally designed for
flat R4. That is we find a one-parameter family of harmonic functions on the Taub-NUT
space with a point singularity, rescale the metric and project the obtained Levi-Civitá
connection onto the other negative su(2)- ⊂ so(4) part. Our solutions will possess
the full U(2) symmetry, and thus provide more solutions to the recently proposed
U(2) symmetric ansatz of Kim and Yoon.
acknowledgement: We would like to acknowledge the financial support provided by the
Miller Institute of Basic Research in Science, the Japan Society for the Promotion
of Science, grant No. P99736 and the partial support by OTKA grant No. T032478.
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Gábor
full_name: Etesi, Gábor
last_name: Etesi
- first_name: Tamas
full_name: Hausel, Tamas
id: 4A0666D8-F248-11E8-B48F-1D18A9856A87
last_name: Hausel
citation:
ama: 'Etesi G, Hausel T. Geometric construction of new Yang-Mills instantons over
Taub-NUT space. Physics Letters, Section B: Nuclear, Elementary Particle and
High-Energy Physics. 2001;514(1-2):189-199. doi:10.1016/S0370-2693(01)00821-8'
apa: 'Etesi, G., & Hausel, T. (2001). Geometric construction of new Yang-Mills
instantons over Taub-NUT space. Physics Letters, Section B: Nuclear, Elementary
Particle and High-Energy Physics. Elsevier. https://doi.org/10.1016/S0370-2693(01)00821-8'
chicago: 'Etesi, Gábor, and Tamás Hausel. “Geometric Construction of New Yang-Mills
Instantons over Taub-NUT Space.” Physics Letters, Section B: Nuclear, Elementary
Particle and High-Energy Physics. Elsevier, 2001. https://doi.org/10.1016/S0370-2693(01)00821-8.'
ieee: 'G. Etesi and T. Hausel, “Geometric construction of new Yang-Mills instantons
over Taub-NUT space,” Physics Letters, Section B: Nuclear, Elementary Particle
and High-Energy Physics, vol. 514, no. 1–2. Elsevier, pp. 189–199, 2001.'
ista: 'Etesi G, Hausel T. 2001. Geometric construction of new Yang-Mills instantons
over Taub-NUT space. Physics Letters, Section B: Nuclear, Elementary Particle
and High-Energy Physics. 514(1–2), 189–199.'
mla: 'Etesi, Gábor, and Tamás Hausel. “Geometric Construction of New Yang-Mills
Instantons over Taub-NUT Space.” Physics Letters, Section B: Nuclear, Elementary
Particle and High-Energy Physics, vol. 514, no. 1–2, Elsevier, 2001, pp. 189–99,
doi:10.1016/S0370-2693(01)00821-8.'
short: 'G. Etesi, T. Hausel, Physics Letters, Section B: Nuclear, Elementary Particle
and High-Energy Physics 514 (2001) 189–199.'
date_created: 2018-12-11T11:52:07Z
date_published: 2001-08-09T00:00:00Z
date_updated: 2023-05-31T11:51:37Z
day: '09'
doi: 10.1016/S0370-2693(01)00821-8
extern: '1'
external_id:
arxiv:
- hep-th/0105118
intvolume: ' 514'
issue: 1-2
language:
- iso: eng
main_file_link:
- open_access: '1'
url: http://arxiv.org/abs/hep-th/0105118
month: '08'
oa: 1
oa_version: Preprint
page: 189 - 199
publication: 'Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy
Physics'
publication_identifier:
issn:
- 0370-2693
publication_status: published
publisher: Elsevier
publist_id: '5743'
quality_controlled: '1'
scopus_import: '1'
status: public
title: Geometric construction of new Yang-Mills instantons over Taub-NUT space
type: journal_article
user_id: ea97e931-d5af-11eb-85d4-e6957dddbf17
volume: 514
year: '2001'
...