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Paolo Bartalini


Title: Professor
PhD: University of Perugia and University of Roma – La Sapienza (1997).
Research Area: Experimental High-energy Particle and Nuclear Physics
Email: paolo.bartalini@cern.ch
Phone (CCNU +86 02767867995
Phone (CERN) +41 227674457
Office: 9417
Related Links: http://cern.ch/bartalin Research Interest:
The research interests of Prof. Paolo Bartalini involve primarily experimental high
energy and nuclear physics at colliders, in particular the study of Quantum Chromo
Dynamics (QCD) and Electro-Weak (EW) physics aimed at constraining the Standard
Model (SM) and at finding evidence for new physics. In order to provide a
homogeneous picture of the relevant phenomenology at hadron and ion colliders it
is essential to invoke the concept of the Multiple Parton Interactions (MPI). In his
recent work Prof. Paolo Bartalini has contributed to constrain the MPI in pp
interactions. He is currently organizing an ambitious research plan in ALICE aiming at
generalizing the MPI measurements in pp, pA and AA interactions at the LHC/LIC.
The strategy to realise this research plan is twofold:
1) study of the soft MPI in large multiplicity events.
2) study of the Double Parton Scattering (DPS) in final states with heavy flavours.
In order to realize the first part of the research plan, prof. Paolo Bartalini joined the
task force on the study of large multiplicity events in the forthcoming run of the LHC.
He will especially focus on the paper reporting the study of the pseudorapidity and
multiplicity distributions in pp interactions at 13 TeV. In perspective he will continue
to guarantee responsibility in this field for the subsequent papers at high
centre-of-mass energies and with different initial states (pA, AA).
The second part of the research plan focuses on the study of Standard Model (SM)
processes with two or more separate hard scatterings in a single collision, that
account for phenomena which may fake new physics or evidence of flow effects in
dense matter. Their study is crucial to consolidate the knowledge of the
corresponding relevant backgrounds. The goal is to detect clear patterns of two (or
more) leading MPI in the same pp (or pPb) interaction. The hard MPI properties in
proton-proton and proton-nucleus collisions are studied measuring extra jet
production in di-jet and/or direct photon events at different centre of mass energies
and at different energy scales of the two hardest partonic interactions. Selecting
extra jets with heavy flavour tagging significantly reduces the background from
Single Parton Scattering (SPS).
There’s a big opportunity to influence the design and technology choice of the future
ALICE upgrades according to the requirement of the MPI measurements: a
significant fraction of the resources are invested in the simulation studies for the
physics performances of the Inner Tracker System (ITS) upgrade; in particular the
MPI studies exploiting charged jet reconstruction can take advantage from a possible
extension in the pseudorapidity coverage that is still an option in the ITS design.
Triggering on high multiplicity events without introducing biases related to the
presence of a jet is stringent in order to study in detail these interactions
characterised by the presence of several MPI; different solutions, including the
possibility of introducing the ITS in the level one trigger, are considered in this light.
The following pre-prints contributed by prof. Paolo Bartalini help to appreciate the
status of the art of the MPI research line as well as its possible impact on the other
research line supported by the Heavy Ion community.
- “Thoughts on opportunities from high-energy nuclear collisions”. By Federico
Antinori, Nestor Armesto, Paolo Bartalini, Rene Bellwied, Peter Braun-Munzinger,
Brian Cole, Andrea Dainese, Marek Gazdzicki et al. Proceedings of the forum on
the future of Heavy Ion Physics. Mont Sainte Odile (France), 24-25 May 2014.
arXiv:1409.2981 [hep-ph].
- “Progress in Double Parton Scattering Studies”. By Paolo Bartalini (ed), Markus
Diehl (ed) and Daniele Treleani (ed). Proceedings of the 5th MPI@LHC workshop
(Double Parton Scattering working group). Antwerp (Belgium), 1-5 December
2013. arXiv:1410.6664 [hep-ph]. Work
• Since 2013/09 Professor at China Central Normal University (CCNU).
• 2007/07 - 2013/09 Scholar scientist & associate professor at National Taiwan
University (NTU).
• 2004/07 - 2007/06 Senior research associate at the University of Florida (UF).
• 2002/01 - 2004/06 CERN Fellow.
• 1997/11 - 2001/12 First assistant at the University of Lausanne / EPFL. Education
• 1997/07 Ph.D. in Physics at the University of Perugia (defended at the University
“La Sapienza”, Rome).
Title of dissertation: Search for flavour changing decays of the Z0 boson at LEP.
Thesis advisers : Prof. R. Battiston (University of Perugia), Prof. A. Bay (EPFL)
• 1993/07 M.S. in Physics at the University of Pisa.
Title of dissertation : Interference in the QCD radiation at the Tevatron ppbar
collider.
Thesis advisor : Prof. Paola Giannetti (INFN Pisa). Official Responsibilities 01/2010 - 06/2013 - Coordinator of the CMS Soft QCD group that in the period of his
mandate delivered 15 papers published in international High Energy Physics journals. 01/2008 - 12/2009 - Convener of the Monte Carlo Generator group in the CMS
experiment and ex-officio member of the CMS Physics Coordinators group. 04/2003 - 07/2006 - Leader of the Generator sub-project of the GRID Computing at
the LHC (LCG) 01/2002 - 06/2004 - Responsible of the prototype and production tests for the CMS
Tracker Outer Barrel at CERN. 11/1997 - 12/2001 - Coordinator of the LHCb Monte Carlo group and Swiss
representative in the LHCb computing model group. Other highlights
In 2008 Prof. Paolo Bartalini launched the international workshop MPI@LHC, acting
as main organizer, chair of the Scientific Advisory committee and editor of the
proceedings, playing important official roles also in the subsequent editions of the
same successful workshop. In his career Prof. Paolo Bartalini has given around 20
Invited presentations to peer-reviewed, internationally established conferences
and/or international advanced schools. Selected Publications
In more than 15 years of research in the High Energy Physics world, Prof. Paolo
Bartalini has often acted as referee of papers published in Physics Letters B and EJPC.
He has signed around 700 peer-reviewed publications on international scientific
journals, the most representative highlights being the following:
• P. Bartalini, “Multi-particle production of hadrons,” Mod. Phys. Lett. A 28, 1330010
(2013).
• S. Chatrchyan et al. [CMS Collaboration], “Observation of a new boson at a mass of
125 GeV with the CMS experiment at the LHC,” Phys. Lett. B 716 (2012) 30.
• S. Chatrchyan et al. [CMS Collaboration], “Measurement of the Underlying Event
Activity at the LHC with √s = 7 TeV and Comparison with √s = 0.9 TeV,” JHEP
1109 (2011) 109.
• Khachatryan et al. [CMS Collaboration], “Observation of Long-Range Near-Side
Angular Correlations in Proton-Proton Collisions at the LHC,” JHEP 1009 (2010)
091.
• P. Achard et al. [L3 Collaboration], “Search for single top production at LEP,”
Phys.Lett. B 549, 290 (2002). Recent Publications
In the last year, Prof. Paolo Bartalini was co-author of around 50 international
peer-reviewed publications, including two papers on Double Parton Scattering
studies at the LHC for which he played the role of editor and coordinator as well as
the first three papers signed as member of the ALICE collaboration.
• S. Chatrchyan et al. [CMS Collaboration], “Measurement of four-jet production in
proton-proton collisions at $\sqrt{s}=7$ TeV”. By CMS Collaboration (Serguei
Chatrchyan et al.). Phys.Rev. D89 (2014) 9, 092010.
• S. Chatrchyan et al. [CMS Collaboration], “Study of double parton scattering using
W + 2-jet events in proton-proton collisions at $\sqrt{s}$ = 7 TeV”. By.
arXiv:1312.5729, JHEP 1403 (2014) 032.
• Jaroslav Adam et al. [ALICE Collaboration], “Two-pion femtoscopy in p-Pb collisions
at $\sqrt{s_{\rm NN}}=5.02$ TeV”. arXiv:1502.00559 [nucl-ex].
• Jaroslav Adam et al. [ALICE Collaboration], “Forward-backward multiplicity
correlations in pp collisions at $\sqrt{s}$=0.9, 2.76 and 7 TeV”,
arXiv:1502.00230 [nucl-ex].
• Jaroslav Adam et al. [ALICE Collaboration], “Centrality dependence of particle
production in p-Pb collisions at $\sqrt{s_{\rm NN} }$= 5.02 TeV”,
arXiv:1412.6828 [nucl-ex].
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