Coalescence paper meeting

Thursday 12 May 2022, 11:29 → 12:30 Europe/Rome

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Francesca Bellini (Università di Bologna e INFN, Bologna), Laura Fabbietti (Technische Universität München)

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Minutes:

Sushanta:

• submitted 300M pythia events for 13TeV
• will work on HM trigger
• reports the multiplicity distribution and loss factor after HM trigger next week
• Will add deuterons to the study (not only antideuterons)

Chiara:

• There will be no in-Jet coalescence for high multiplicity in the paper
• it would make the paper too long (would require e.g. protons in HM, etc...)
• In our paper, we will assume that the in-Jet coalescence in HM is the same as in MB (which it is, we just cannot show it)

Luca:

• Fit the EPOS p+pbar spectra with a Blast Wave fit (works very well) and a Levy-Tsallis (works very poorly)
• EPOS events at 900 GeV: only 1M available -> need to run more
• EPOS events at 13TeV: 300M events are about to be submitted to the LRZ, Ante needs to modify some code still)

Francesca:

• made the p0 vs pT/A plot with added 13 TeV (MB and HM 1-3)
• We will fit the p0 with a pol2 or pol3 (use pol2 for equal fit quality)

Bhawani:

• started to learn how to calculate Wigner functions

Maxi:

• Studied the physical properties of the different wave functions available
• in this study, it was found, that the Hulthén that was used produced much too large deuteron radii (~50fm)
• It turns out the Hulthen used by Kachelriess (with an additional 1/r factor) was indeed the correct Hulthén and the one used by us was only the Harmonic oscillator solution which is only one part of the deuteron wave function
• all the other wave functions have reasonable physical properties
• for the Gaussian wave functions only the deuteron radius could be calculated since they do not include a D-Wave
• for the Hulthen a D-Wave function was used to calculate the Quadrupole moment and magnetic moment, but using it for actual coalescence predictions is not required, since the D-State probability is only ~5.6%, so not using it introduces only a small error
• Will work on implementing the new source in EPOS
• Will add deuterons (not only antideuterons)
• redo the d+dbar spectra with recently completed 100M statistics and new proton fit.

11:29 → 11:30 Google doc

Link

11:30 → 11:40 Progress report - Maxi

Speaker: Maxi Horst

CPM - WaveFunctionProperties.pdf

11:40 → 11:50 Progress report - Sushanta

Speaker: Sushanta Tripathy (INFN, Bologna (IT))

Status_Sushanta-12May2022.pdf

11:50 → 12:00 Progress report - Luca

Speaker: Luca Barioglio

Coalescence_paper.pdf

12:00 → 12:10 Progress report - Chiara

Speaker: Chiara Pinto

12:10 → 12:25 Progress report - Francesca

Speaker: Francesca Bellini (Università di Bologna e INFN, Bologna)