Particle Physics Day 2017

Friday 20 Oct 2017, 10:30 → 18:05 Europe/Helsinki

Hotel Arthur (Vuorikatu 19, Helsinki)

Aleksi Vuorinen, Mikko Voutilainen (Helsinki Institute of Physics (FI))

Annual meeting of the Particle Physics Division of the Finnish Physical Society at Hotel Arthur, Vuorikatu 19, 00100 Helsinki.

Registration is now closed.

Previous meetings:

Jyväskylä Nov 25th, 2016: http://users.jyu.fi/~tulappi/hitupva16.html

Helsinki Oct 30, 2015: https://indico.cern.ch/event/279875/

10:30 → 11:00 Morning coffee

11:00 → 12:30 QCD session

11:00 QCD theory overview

Speaker: Tuomas Lappi (University of Jyvaskyla)

hitupva17.pdf

11:30 ALICE experimental overview

Speaker: Dong Jo Kim (University of Jyvaskyla (FI))

alice_ppd2017.pdf

12:00 EPPS16 – First nuclear PDFs to include LHC data

We present results of our recent EPPS16 global analysis of NLO nuclear parton distribution functions (nPDFs). For the first time, dijet and heavy gauge boson production data from LHC proton–lead collisions have been included in a global fit. Especially, the CMS dijets play an important role in constraining the nuclear effects in gluon distributions. With the inclusion of also neutrino–nucleus deeply-inelastic scattering and pion–nucleus Drell–Yan data and a proper treatment of isospin-corrected data, we were able to free the flavor dependence of the valence and sea quark nuclear modifications for the first time. This gives us less biased, yet larger, flavor by flavor uncertainty estimates. The EPPS16 analysis indicates no tension between the data sets used, which supports the validity of collinear factorization and universal nPDFs for nuclear hard-collision processes in the kinematical range studied.

Speaker: Petja Paakkinen (University of Jyväskylä)

Paakkinen-EPPS16.pdf

12:10 Deep inelastic scattering in the dipole picture at next-to-leading order

We study quantitatively the importance of the recently derived NLO corrections to the DIS structure functions at small x in the dipole formalism. We show that these corrections can be significant and depend on the factorization scheme used to resum large logarithms of energy into renormalization group evolution with the BK equation. This feature is similar to what has recently been observed for single inclusive forward hadron production. Using a factorization scheme consistent with the one recently proposed for the single inclusive cross section, we show that it is possible to obtain meaningful results for the DIS cross sections.

Speaker: Henri Johannes Hanninen (Helsinki Institute of Physics (FI))

PPD2017_NLODIS_Hanninen.pdf

12:20 Linear and non-linear flow mode in 5 TeV Pb-Pb

Speaker: Jasper Parkkila (University of Jyvaskyla (FI))

PPD2017-NL-Parkkila.pdf

12:30 → 13:30 Buffet lunch

13:30 → 15:00 BSM session

13:30 Particle cosmology theory overview

Speaker: Venus Keus (University of Helsinki)

PPD-2017.pdf

14:00 CMS+TOTEM experimental overview

Speaker: Henning Kirschenmann (Helsinki Institute of Physics (FI))

2017_10_20_CMSTOTEM_PPD.pdf

14:30 Non-perturbative study of Electroweak Phase Transition in BSM models

Electroweak Phase Transition is frequently studied perturbatively by using finite T effective potential. In this talk, we remind how non-perturbative analysis can be performed and discuss our findings and their implications.

Speaker: Tuomas Tenkanen

particle_physics_day.pdf

14:45 Search for charged Higgs bosons in the CMS experiment

The Standard Model is one of the most successful theories of our time, but there still appear problems in the theory. One way to overcome these problems is an extended scalar sector. By adding an additional scalar doublet to the Standard Model we can predict in total five Higgs bosons instead of one and two of these are charged. At CERN LHC the charged Higgs bosons (H+) are searched for and the production mode depends on the mass of the charged boson. If the charged Higgs boson is lighter than the top quark mass the production happens through t -> H+b, but H+ that are heavier than a top quark can be produced through tb -> H+. This talk considers the fully hadronic final state of H+ -> τν and the analysis used in the search will be presented. The talk will also give an overview of the expected limits for the producton of the charged Higgs boson with 13 TeV and 35 fb-1, covering the mass range of 80-3000 GeV.

Speaker: Mikko Lotti (Helsinki Institute of Physics (FI))

PPD_20102017_Mikko_Lotti_chargedHiggs.pdf

15:00 → 15:30 Afternoon coffee

15:30 → 17:00 OTH session

15:30 Holography theory overview talk

Speaker: Dr Niko Jokela

OTH1_NikoJokela_hitupaiva17.pdf

16:00 Neutrino physics experimental overview

Speaker: Kai Krister Loo (University of Jyvaskyla (FI))

PPD_ExpNeutrino_KaiLoo_201017.pdf

PPD_ExpNeutrino_KaiLoo_201017.pptx

16:30 Constraints to Triplet Higgs model from oscillation experiments

The triplet scalars, predicted by the left-right symmetric SU(2)xSU(2)xU(1) model and utilized in Type II seesaw model to explain the lightness of neutrinos, would generate nonstandard interactions (NSI) for neutrino propagating in matter. The bounds for NSI would then translate into constraints on the triplet Higgs model. I introduce the model and present current bounds and bounds improved by DUNE, the future long baseline neutrino oscillation experiment.

Speaker: Timo Johnny Karkkainen (Helsinki Institute of Physics (FI))

HFP2017.pdf

16:45 Neutrino oscillations in BSM physics

Following the celebrated discovery of neutrino oscillations, it became clear that the Standard Model had acquired yet another problem it could not explain: the origin of neutrino mass. Over the last few decades neutrino physics has seen an amazing progress, and very recently the field entered a new era, where properties of the standard three-neutrino paradigm can be tested to a high precision. In this talk I will make a very briefly review on what the recent and near-future developments in neutrino oscillation physics could teach us about what could possibly lie beyond the Standard Model.

Speaker: Sampsa Vihonen

PPD2017_VihonenSampsa_v3.pdf

17:05 → 18:00 Division meeting: RECFA representative + ECFA delegate selection

Preliminary agenda:
1. Opening of the meeting, choosing the chair and secretary, and two persons for counting votes
2. Accepting the agenda
3. Choosing the board
4. Activity of the division 2016-2017
5. Meetings organized in Finland 2016-2017
6. Meetings to be organized in Finland 2017-2018
7. Vote for RECFA representative
8. Vote for ECFA delegate
9. AOB
10. Closing the meeting

Convener: Tuomas Lappi (University of Jyvaskyla)