Student Presentations at FAPPS09

At the beginning of the school, a set of papers (or group of papers) will be brought in to the students, about different experimental or phenomenological aspects of particle physics. Those papers have been chosen by the school lecturers in relation to their course. During the two weeks, students, in group of three, will be asked to read one of these paper(s) and to prepare a ten minute presentation to be given at the end of the school. FAPPS is intended to be a melting pot of Asian and European students. The first rule is then to build three people groups, mixing nationalities and even continents. Another important rule is to stick to your time, because we will have at least 15 presentations to accommodate in one afternoon!

Some hints to help you:

• Some of the papers are very long, some very short… The shorter is not always the easier! Select your subject according to your interest and taste, and not to the paper “weight”.
• Do not even think to be all-comprehensive! 10 minutes are a very short time, corresponding to 10 PowerPoint slides at maximum.
• Try to find out the key ideas of the paper: a physical process, an algorithm, a more precise result, etc. As you will not be allowed to go into details of all of them because of time, select your favorite one(s).
• Do not hesitate to ask questions to lecturers and organizer. Look at the schedule to see when they are present.
• Last but not least: do not forget rehearsing. This is the only way to find the good timing. Lecturers can help you for rehearsal too!

The papers are listed below. Have a look before going to Fujiyoshida: you will make your final choice on Friday November 6th, during the session called "Preparation for the student presentations".

Good luck !

Lydia & Didier

Electroweak Physics

Proposed by Vanina Ruhlmann-Kleider.

• Measurement of the standard model parameters from a study of W and Z bosons, UA2 collaboration, Phys. Lett. B186 (1987) 440

Tests of the standard model by one of the experiments which first observed the weak intermediate bosons in the 80's at CERN. This is much less precise than what was done in the next generation of experiments (LEP and SLC) but is interesting to read for historical reasons. Note also that the measurement of the W decay product asymmetry presented in this paper was not repeated afterwards.

• A precise determination of the electroweak mixing angle from semileptonic neutrino scattering, the CHARM collaboration, Z. Phys. C36 (1987) 611.

Determination of the electroweak mixing angle from neutrino scattering before the advent of LEP/SLC experiments. At that time, neutrino scattering offered the most precise method to measure sin2(theta_w). Comparing their measurement with that deduced from W and Z masses measured at hadron colliders, this paper concluded that standard model calculations had to be pushed beyond first order to reconcile the different experiments. The aim of LEP/SLC experiments was to test these extended calculations with great precision.

• A combined analysis of the hadronic and leptonic decays of the Z0, OPAL collaboration, Phys. Lett. B240 (1990) 497.

Early derivation of the number of neutrino species from measurements of the Z0 line shape from the first year of data taking at LEP. This is the first constraint that LEP experiments placed on the standard model after only one year of running and a modest amount of Z0 events collected. The precision on the number of neutrino species improved a lot afterwards when millions of Z decays were recorded but the conclusion remained identical.

• Updated parameters of the Z0 resonance from combined preliminary data of the LEP experiments, the LEP collaborations, CERN-PPE/93-157.

Combination of all four LEP experiment measurements on the Z0 resonance that gave the first indirect constraint on the top quark mass before its discovery at the Tevatron. More technical that the other papers (less experimental details) this publication explains how the standard model can be tested with precise electroweak measurements.

• Cross-sections and leptonic forward-backward asymmetries from the Z0 running of LEP, DELPHI collaboration, Eur. Phys. J C16 (2000) 371.

Summary of all Z cross-section and Z decay angular asymmetry measurements performed at LEP1 by one of the LEP experiments. All measurements reported here are final. They are used to test the standard model and derive indirect constraints on various standard model parameters (number of neutrino species, top mass, strong interaction coupling constant...). This is an example of constraints that can be placed on the standard model with the full statistics of LEP1. By combining more measurements from the four LEP experiments as well as from other experiments the standard model can be tested even more precisely.

• First run II measurement of the W boson, the CDF collaboration, Phys. Rev. D77 (2008) 112001.

First measurement of the W mass from run II data at the Tevatron. Experimental details are given about the event selection and the method to ensure a precise measurement of the W mass, which is an key ingredient of the standard model tests.

Higgs Searches

Proposed by Lydia Roos

• Search for Higgs decays into two-photon final state at D0 (D0 Note 5880-CONF) and CDF (arXiv:0905.0413v2). Prospects with the Atlas experiment (ATL-PHYS-PROC-2009-056).

Top Physics

Proposed by Vanina Ruhlmann-Kleider.

• Measurement of the top quark mass in the lepton+jets channel using the matrix element method on 3.6fb-1 of D0 run II data, the D0 collaboration, D0 note 5877-CONF.

One of the most precise measurements of the top quark mass at the Tevatron. Describes the event selection, the (not trivial) method used to derive the mass and the calibration of the method. The precise value of the top mass is a key ingredient of the standard model tests.

Proposed by Didier Vlanova.

• Observation of single top quark production at D0 (arXiv:0903,0850v2).

For more details on the analysis, one can also read the first D0 paper showing evidence of single quark production (arXiv:0803,0739v2).

B physics

Proposed by Stephane T'Jampens.

• The measurement of sin2beta at BABAR and Belle (Phys.Rev.Lett.87:091801,2001, Phys.Rev.Lett.87:091802,2001)

To be linked with the 2008 Nobel prize. The papers to be read are the 2001 papers that established CP Violation in B-meson system in agreement with the KM mechanism. Also included are the PRD papers to have more details (Phys.Rev.D66:032003,2002, Phys.Rev.D66:071102,2002).

Proposed by Youngjoon Kwon.

• Study of electroweak penguin decays of B mesons from B-factory experiment (Phys. Rev. D 69, 112001, 2004, Phys. Rev. Lett. 91, 261601, 2003 and axXiv:0904.0770v2)

Charm Physics

Proposed by Changzheng Yuan.

• Study of psi'-->pi+pi-J/psi and search for other states decay into pi+pi-J/psi, with J/psi-->lepton pair, at BES (Phys.Rev.D62:032002,2000), CLEO (Phys.Rev.D78:011102,2008) and Belle (Phys.Rev.Lett.99:182004,2007)

Rare KL decay

Proposed by Takeshi Komatsubara

• CP-violating decay KL->pi0nunubar

Main reference is Phys. Rev. D39 (1989), 3322. To get more on the theoretical discussions beyond the Standard Model, see also Phys. Lett. B398 (197), 163. Experimental searches are presented in Phys. Rev. D61 (2000), 072006 and Phys. Rev. Lett. 100 (2008), 201802.

Muon lepton-flavor violation

Proposed by Takeshi Komatsubara

• Charged Lepton Flavor Violation Experiments

Main reference is Annu. Rev. Nucl. Part. Sci. 58 (208), 315, Sections 1 and 2. One additionnal paper is Rev. Mod. Phys. 73 (2001) 151.

Neutrino Oscillations

Proposed by Kunio Inoue and Takashi Kobayashi

• Neutrino oscillation evidence by SuperKamiokande (Phys. Rev. Lett. 81, 1998 1562-1567), SNO (Phys. Rev. Lett. 89, No. 1, 011301, 2002), KamLand (Phys. Rev. Lett. 90 2003, 021802), and K2K (Phys. Rev. Lett. 94:081802, 2005).

Beyond the Standard Model

• Susy Searches at Tevatron: D0 (Phys. Lett. B 680, 34, 2009) and CDF (Phys. Phys. Lett. 102, 121801, 2009)

Proposed by Sabine Kraml

• Phenomenological Studies on Signals for minimal supergravity at LHC, in multijet (Phys.Rev.D52:2746-2759,1995) and multilepton (Phys.Rev.D53:6241-6264,1996) final states.