During the first year of data taking ALICE has collected large data samples from pp collisions at the LHC (s=900 GeV and 7 TeV). They allowed us to have a first look at high-pT phenomena in a new ...energy regime. We give an overview of first results from the study of jet-like correlations and neutral meson production.
Proton-nucleus (p+A) collisions have long been recognized as a crucial component of the physics program with nuclear beams at high energies, in particular for their reference role to interpret and ...understand nucleus-nucleus data as well as for their potential to elucidate the partonic structure of matter at low parton fractional momenta (small-x). Here, we summarize the main motivations that make a proton-nucleus run a decisive ingredient for a successful heavy-ion program at the Large Hadron Collider (LHC) and we present unique scientific opportunities arising from these collisions. We also review the status of ongoing discussions about operation plans for the p+A mode at the LHC.
Abstract A study of prompt and non-prompt $$\mathrm {J}/\psi $$ J/ψ production as a function of charged-particle multiplicity in inelastic proton–proton (pp) collisions at a centre-of-mass energy of ...$$\sqrt{s}$$ s = 13 TeV based on calculations using the PYTHIA8 Monte Carlo is reported. Recent experimental data shows an intriguing stronger-than-linear increase of the self-normalized $$\mathrm {J}/\psi $$ J/ψ yield with multiplicity; several models, based on initial or final state effects, have been able to describe the observed behaviour. In this paper, the microscopic reasons for this behaviour, like the role of multiple parton interactions, colour reconnections and auto-correlations are investigated. It is observed that the stronger-than-linear increase and the transverse momentum ($$p_\mathrm {T}$$ pT ) dependence, contrary to what is predicted by the other available models, can be attributed to auto-correlation effects only. In absence of auto-correlation effects, the increase of the yield of $$\mathrm {J}/\psi $$ J/ψ with multiplicity – and in general for all hard processes – is weaker than linear for multiplicities exceeding about three times the mean multiplicity. The possibility of disentangling auto-correlation effects from other physical phenomena by measuring the charged-particle multiplicity in different pseudo-rapidity and azimuthal regions relative to the $$\mathrm {J}/\psi $$ J/ψ direction is investigated. In this regard, it is suggested to extend the experimental measurements of $$\mathrm {J}/\psi $$ J/ψ production as a function of the charged-particle multiplicity by determining the multiplicity in several azimuthal regions and in particular in the Transverse region with respect to the direction of the $$\mathrm {J}/\psi $$ J/ψ meson.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
QCD challenges from pp to A–A collisions Adolfsson, J.; Andronic, A.; Bierlich, C. ...
The European physical journal. A, Hadrons and nuclei,
2020, Letnik:
56, Številka:
11
Journal Article
Recenzirano
Odprti dostop
This paper is a write-up of the ideas that were presented, developed and discussed at the third International Workshop on QCD Challenges from pp to A–A, which took place in August 2019 in Lund, ...Sweden (Workshop link:
https://indico.lucas.lu.se/event/1214/
). The goal of the workshop was to focus on some of the open questions in the field and try to come up with concrete suggestions for how to make progress on both the experimental and theoretical sides. The paper gives a brief introduction to each topic and then summarizes the primary results.
In central Pb-Pb collisions at the LHC at ' = 5.5 TeV, high rates are expected at energies at which jets can be reconstructed against the large background of the nucleus-nucleus underlying event. ...This will open the possibility to quantify the effect of partonic energy loss through medium induced gluon radiation (jet quenching) by detailed measurements of the modification of the longitudinal and transverse structure of identified jets. ALICE will use a combination of its central tracking system and the electromagnetic calorimeter (EMCal) to measure and trigger on jets. The projected performance of ALICE to perform these jet measurements will be discussed. The simulation results presented here have been also published in 1,2.
Drawing structures, mechanisms, and syntheses is a vital part of success in organic chemistry courses. ChemDraw for iPad has been used to increase classroom experiences in the preparation of high ...quality chemical drawings. The embedded Flick-to-Share allows for simple, real-time exchange of ChemDraw documents. ChemDraw for iPad also allows documents to be readily shared with students via e-mail directly from the program. ChemDraw for iPad increased engagement and enhanced interactions between students and instructors in organic chemistry classes.
Student-generated video in chemistry education Gallardo-Williams, Maria; Morsch, Layne A; Paye, Ciana ...
Chemistry Education Research and Practice,
04/2020, Letnik:
21, Številka:
2
Journal Article
Recenzirano
Student-generated videos are growing in popularity in education generally, and in chemistry education there are several reports emerging on their use in practice. Interest in their use in chemistry ...is grounded in the visual nature of chemistry, the role of laboratory work in chemistry, and a desire to enhance digital literacy skills. In this perspective, we consider the place of student-generated videos in chemistry education, by first considering an appropriate pedagogical rationale for their usage. We then survey the reports of student-generated video with this framework in mind, exploring the role of generation in the reports surveyed. From this, we summarise the current status of student-generated videos in chemistry education and highlight from our readings some considerations for future research in this area, as well as guidelines for practitioners wishing to integrate student-generated video into their practice.
A study of prompt and non-prompt
J
/
ψ
production as a function of charged-particle multiplicity in inelastic proton–proton (pp) collisions at a centre-of-mass energy of
s
= 13 TeV based on ...calculations using the PYTHIA8 Monte Carlo is reported. Recent experimental data shows an intriguing stronger-than-linear increase of the self-normalized
J
/
ψ
yield with multiplicity; several models, based on initial or final state effects, have been able to describe the observed behaviour. In this paper, the microscopic reasons for this behaviour, like the role of multiple parton interactions, colour reconnections and auto-correlations are investigated. It is observed that the stronger-than-linear increase and the transverse momentum (
p
T
) dependence, contrary to what is predicted by the other available models, can be attributed to auto-correlation effects only. In absence of auto-correlation effects, the increase of the yield of
J
/
ψ
with multiplicity – and in general for all hard processes – is weaker than linear for multiplicities exceeding about three times the mean multiplicity. The possibility of disentangling auto-correlation effects from other physical phenomena by measuring the charged-particle multiplicity in different pseudo-rapidity and azimuthal regions relative to the
J
/
ψ
direction is investigated. In this regard, it is suggested to extend the experimental measurements of
J
/
ψ
production as a function of the charged-particle multiplicity by determining the multiplicity in several azimuthal regions and in particular in the Transverse region with respect to the direction of the
J
/
ψ
meson.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
An inquiry-based activity is described in which organic-chemistry students explore how IR radiation impacts functional-group-bond movements. Through the iSpartan and Spartan apps, students calculate ...the IR spectra for select organic compounds and manipulate the resulting 3D models and IR spectra to visualize bond vibrations. After developing an IR-frequency chart on the basis of these observations, the students analyze spectral data for the presence of functional groups. The results showed that students successfully prepared the chart and analyzed IR-spectral data without previous experience with IR spectroscopy or instructor intervention. Student responses to the inquiry-based learning activity were favorable. This activity was implemented at three academic institutions over a 4 year period and is an attractive approach for students to explore IR spectroscopy in a nonthreatening environment.
While cheminformatics skills necessary for dealing with an ever-increasing amount of chemical information are considered important for students pursuing STEM careers in the age of big data, many ...schools do not offer a cheminformatics course or alternative training opportunities. This paper presents the Cheminformatics Online Chemistry Course (OLCC), which is organized and run by the Committee on Computers in Chemical Education (CCCE) of the American Chemical Society (ACS)’s Division of Chemical Education (CHED). The Cheminformatics OLCC is a highly collaborative teaching project involving instructors at multiple schools who teamed up with external chemical information experts recruited across sectors, including government and industry. From 2015 to 2019, three Cheminformatics OLCCs were offered. In each program, the instructors at participating schools would meet face-to-face with the students of a class, while external content experts engaged through online discussions across campuses with both the instructors and students. All the material created in the course has been made available at the open education repositories of LibreTexts and CCCE Web sites for other institutions to adapt to their future needs.
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