# LHC on the March

20-22 November 2012
IHEP, Protvino
Europe/Moscow timezone
20-22 November 2012 the Institute for High Energy Physics carries out an international Workshop
Home > Contribution List
Displaying 39 contributions out of 39
Session: Evening Session
Track: B-physics
In ultra-relativistic heavy-ion collisions, heavy quarks, i.e. charm and beauty, are of particular interest, since they are produced in the early stage of the reaction and coexist with the surrounding medium. Therefore the measurement of open heavy-flavour production in Pb-Pb collisions at the LHC gives access to the mechanisms of heavy-quark transport and energy loss in hot and dense QCD matter. ... More
Presented by Raphaelle BAILHACHE on 20 Nov 2012 at 15:00
Session: Morning Session
Track: Status and performance of the experiments
The ALICE experiment has been running successfully since 2010 and made an impressive progress towards understanding of hot and dense QCD matter produced in heavy-ion collisions at LHC energies. Recent results on identified particle spectra, azimuthal anisotropy, particle correlations, heavy flavour and quarkonia production in PbPb collisions at sqrt(sNN) = 2.76 TeV will be presented. Future physic ... More
Presented by Evgeny KRYSHEN on 20 Nov 2012 at 09:50
Session: Morning Session
Track: Status and performance of the experiments
After successful LHC operation at the center-of-mass energy of 7 TeV in 2011, the LHC is scheduled to deliver even more data in 2012 at 8 TeV. Meanwhile, plans are actively advancing for a series of upgrades, culminating roughly 10 years from now in the high luminosity LHC (HL-LHC) project, delivering of order five times the LHC nominal instantaneous luminosity along with luminosity levelling. The ... More
Presented by Hongbo ZHU on 20 Nov 2012 at 12:30
Session: Evening Session
Track: B-physics
The LHCb experiment is a forward arm spectrometer designed to make high precision measurements of b hadron decays at the LHC. During 2011 a total luminosity of 1.0 fb-1 of data was collected at sqrt(s)=7 TeV. LHCb's efficient dimuon trigger allows to perform studies of B mesons decaying to charmonia with high precision. We will present results on B decays into J/psi and light hadrons, together wit ... More
Presented by Ivan POLYAKOV on 20 Nov 2012 at 18:30
Session: Evening Session
Track: B-physics
Status of B-physics studies in ATLAS is reviewed, starting from Onia results based on dimuon channel. J/psi->mu+mu- decay also serves as a basis for identification of B-mesons and Lambda_b baryons. Results on cross section and lifetime measurements, CP-violation parameters and rare decay searches are also presented.
Presented by Vladimir NIKOLAENKO on 20 Nov 2012 at 14:00
Session: Evening Session
Track: B-physics
With large production cross-section and its unique rapidity coverage, the LHCb detector brings opportunity for $b\bar{b}$ bottomonia studies, hence tests for QCD models. We present here the results of $\Upsilon$ and $\chi_b(1P)$ production at $\sqrt{s}$ = 7 TeV. Also discussed here are studies on the $B_c$ meson, including its production and mass measurement using $B_c^{+} \rightarrow J/\psi \pi^{ ... More Presented by Yiming LI on 20 Nov 2012 at 18:00 Session: Evening Session Track: B-physics The recent results of the CMS experiment in the field of b-quark production, B hadron spectroscopy and decays are reviewed. The B_{s} lifetime difference is measured and the first observation of a new baryon with beauty, the Xi(b)*0 is presented. Presented by Bora AKGUN on 20 Nov 2012 at 14:30 Session: Evening Session Track: Heavy quarkonia Using large data samples of di-muon events, CMS has performed detailed measurements in the field of quarkonium production. Differential cross-sections of (prompt) J/psi, psi(2S) and Y(nS) states in pT and rapidity will be presented, as well as studies of P-wave charmonia (chi_c), using the decay mode J/psi + gamma where the photon converts in an e+e- pair inside the detector. All our measurements ... More Presented by Dr. Jianguo BIAN on 20 Nov 2012 at 17:30 Session: Morning Session Track: Searches for Phenomena beyond the Standard Model To this date CMS has performed a wide range of searches for physics beyond the standard model. The program comprises both broad, inclusive searches as well as exclusive, specialised approaches. In this overview talk, the results with proton-proton collision data both at 7 and 8 TeV will be summarized, with a focus on presenting some highlights of the CMS search program. Presented by Dr. Wolfgang WALTENBERGER on 22 Nov 2012 at 11:00 Session: Evening Session Track: Top quark production and properties We present CMS results on top quark production and properties measurements Presented by Andrew IVANOV on 22 Nov 2012 at 14:30 Session: Evening Session Track: Heavy quarkonia Studies of charm and charmonia production provide important tests of QCD. During 2010 and 2011 the LHCb experiment collected a dataset corresponding to about 1/fb of integrated luminosity in proton-proton collisions at sqrt(s) = 7 TeV. We present measurements of the production of J/psi, psi(2S), chi_c1 and chi_c2 as well as their cross-section ratio, and a cross-section ratio of chi_c to J/psi. We ... More Presented by Alexander ARTAMONOV on 20 Nov 2012 at 15:30 Session: Evening Session Track: B-physics Since most probably Standard Model cannot explain large value of CP asymmetries recently observed in D-meson decays we propose the fourth quark-lepton generation explanation of it. As a byproduct weakly mixed leptons of the fourth generation enable to save the baryon number of the Universe from erasure by sphalerons. Presented by Dr. Mikhail VYSOTSKY on 20 Nov 2012 at 16:30 Session: Evening Session Track: Searches for Higgs On July 4th both ATLAS and CMS announced the observation of a new particle in the search for the Higgs boson. The required sensitivity above 5 sigma could only be achieved by combining different search channels and by analysing both the data from 2011 and 2012. Several production and decay modes can shed light on the properties of this new particle, but the full picture can only be obtained by com ... More Presented by Christian SCHMITT on 22 Nov 2012 at 17:00 Session: Morning Session Track: Searches for Phenomena beyond the Standard Model In cosmic ray experiments, the particles with energies (10^15 – 10^19) eV are investigated. This interval corresponds to (1.4 – 140) TeV in the center-of-mass system, which is 10 times higher than maximum LHC energy. Many unusual results in cosmic ray experiments in this energy interval were observed, which cannot be explained in frame of existing theoretical models and approaches. For their e ... More Presented by Prof. Anatoly PETRUKHIN on 22 Nov 2012 at 10:00 Session: Morning Session Track: Status and performance of the experiments We report on the development of a software simulator of the detector control system for the ALICE Photon Spectrometer (PHOS). PHOS is an electromagnetic calorimeter, part of the ALICE experiment installed at the CERN Large Hadron Collider (LHC). The simulator was design and developed based on the experience acquired during the first years of operation of the detector, from 2009 to 2012. It simula ... More Presented by Alexander MAMONOV on 20 Nov 2012 at 10:30 Session: Evening Session Track: Electroweak phenomena The measurement of WW, WZ, ZZ, W$\gamma$and Z$\gamma$production cross-sections allow for precision tests of the electroweak (EW) dynamics of the Standard Model (SM). Differences between measured and predicted SM cross-sections could prove evidence for new phenomena. The diboson processes are also an important source of background to Higgs production decaying into vector boson pairs, such as$H\r ... More
Presented by Geraldine CONTI on 22 Nov 2012 at 15:00
Session: Morning Session
Track: LEP3 Higgs factory
Various approaches to Higgs factories are discussed: LC, storage ring, muon collider, photon collider, etc, incl. news from the HF2012, FNAL, Nov. 14-16, 2012.
Presented by Prof. Valery TELNOV on 21 Nov 2012 at 10:00
Session: Evening Session
Track: Searches for Higgs
During July 2012, the ATLAS and CMS collaboration announced together the observation of a new boson in the Higgs searches, with a mass around 126 GeV. Since then, the Large Hadron Collider has been running steadly, providing proton-proton collisions at sqrt(s)=8 TeV; both experiments have now more than doubled the amount of data available since July. I will review the latest results of the ATLAS ... More
Presented by Simone PAGAN GRISO on 22 Nov 2012 at 16:30
Session: Evening Session
Track: Heavy Ions Collisions
The strong electro-magnetic fields produced by ultra-relativistic heavy ions allow for the study of gamma-gamma and gamma-nucleus processes at the CERN Large Hadron Collider. Here, we report first results obtained by ALICE on the J/psi photo-production cross section in Pb-Pb collisions at sqrt(sNN) = 2.76 TeV, both at forward rapidities (-3.6 < y < -2.6) in the mu+mu- channel, and at central rapid ... More
Presented by Christoph MAYER on 21 Nov 2012 at 17:00
Session: Evening Session
Track: Heavy Ions Collisions
Jets are an important tool in testing QCD and probing the hot and dense nuclear matter created in high energy heavy-ion collisions. They can be used to study hard scatterings, fragmentation and hadronisation and how this processes differ from baseline vacuum measurements in case of presence of a partonic medium. Vacuum measurements are obtained from proton-proton collisions. Data taken by the AL ... More
Presented by Rishat SULTANOV on 21 Nov 2012 at 18:30
Session: Evening Session
Track: QCD studies
The associated production of jets and vector bosons allows for stringent tests of perturbative QCD calculations and is sensitive to the possible presence of new physics beyond the Standard Model. Measurements of jet production rates in association with W, Z or photons, in proton-proton collisions at a 7 TeV center-of-mass energy is presented, using data collected with the CMS detector. In particul ... More
Presented by Matteo MARONE on 22 Nov 2012 at 15:30
Session: Morning Session
Track: LEP3 Higgs factory
The discovery of X(125) at CERN, which looks increasingly likely to be the long-awaited Higgs boson, opens the debate of which type of machine would serve best as a Higgs factory. LEP3 is a low-cost, high-luminosity circular e+e- collider operating near the Higgs production optimal centre-of-mass energy of 240GeV. We will briefly discuss what accuracies on Higgs observables are necessary to probe ... More
Presented by m KORATZINOS on 21 Nov 2012 at 09:30
Session: Morning Session
Track: Status and plans of LHC machine
In three years of operation, the LHC has delivered a total of more than 25 fb-1 of integrated luminosity, providing collisions at 7 and 8 TeV c.o.m. The reasons for this tremendous success will be underlined. At the beginning of next year, the machine will be stopped for about 20 months, at the end of which the energy, and therefore the potential for discoveries, will be increased. The details of ... More
Presented by Dr. Mirko POJER on 22 Nov 2012 at 09:30
Session: Morning Session
Track: Status and performance of the experiments
The LHCb experiment is purposed to study the properties of the beauty and charmed particles decays. In such decays the search for the physics beyond the Standard Model is performed in an indirect way, as one expects contribution from non-standard particles and forces to become visible through the branching fractions of the rare decays, CP-asymmetries and many other observables. The LHCb detector p ... More
Presented by Daria SAVRINA on 20 Nov 2012 at 11:20
Session: Morning Session
Track: LEP3 Higgs factory
Particle loss due to the emission of single energetic beamstrahlung photons is shown to impose a fundamental limit on storage ring luminosities at energies more than 2E~140 GeV for head-on collisions and 2E~40 GeV for crab-waist collisions. Above these thresholds the suppression factor due to beamstrahlung scales as 1/E^4/3 and for a fixed power of synchrotron radiation L \propto R/E^13/3. For 2E ... More
Presented by Prof. Valery TELNOV on 21 Nov 2012 at 09:00
Session: Evening Session
Track: Heavy Ions Collisions
Identified hadron spectra are considered to be sensitive to transport properties of strongly interacting matter produced in high-energy nucleus-nucleus collisions. We present measurements of $\pi^0$ and $\eta$ mesons at mid-rapidity in a wide transverse momentum range in pp and Pb-Pb collisions at LHC energies measured with the ALICE detector. The mesons are reconstructed via their two-photon dec ... More
Presented by Dmitry BLAU on 21 Nov 2012 at 17:30
Session: Morning Session
Presented by Nikolai TYURIN on 20 Nov 2012 at 09:00
Session: Evening Session
Track: B-physics
In this presentation, rare decays of B and D mesons are discussed. Such decays are sensitive to the presence of physics beyond the Standard Model as they are mediated by loop diagrams. New physics can be probed by measuring unexpectedly high branching ratios, CP, isospin and forward backward asymmetries and other angular observables. The last results of LHCb experiment in this field are presented.
Presented by Olga KOCHEBINA on 20 Nov 2012 at 17:00
Session: Evening Session
Track: Heavy Ions Collisions
A cross-over between ordinary nuclear matter and a state of deconfined quarks and gluons, the Quark Gluon Plasma (QGP) is predicted by lattice QCD calculations. Experimentally, ultra-relativistic heavy ion collisions are used to study such a hot and dense medium. Jets are sensitive to early stage of heavy ion collisions. This property allows to probe the QGP. Their strong interaction with the med ... More
Presented by Alexandre SHABETAI on 21 Nov 2012 at 18:00
Session: Evening Session
Track: Searches for Higgs
Results are presented from searches for the standard model (SM) Higgs boson in proton-proton collisions at $\sqrt{s}=7$ and 8 TeV in five decay modes: $gamma \gamma$, $bb$, $\tau \tau$, $WW$, and $ZZ$. The analysed data correspond to integrated luminosities of up to 5.1 1/fb at 7 TeV and 5.3 1/fb at 8 TeV. The data exclude the existence of a SM Higgs boson in the ranges 110--122.5 and 127--600 GeV ... More
Presented by Mikhail KIRSANOV on 22 Nov 2012 at 17:30
Session: Morning Session
Track: Searches for Phenomena beyond the Standard Model
With the upgrade of LHC center of mass energy to 8 TeV along with high intensity beams, many regions of beyond standard model physics are able to be probed for the first time. This talk will present the current status of the ATLAS SUSY and exotic searches with a focus on the most recent 8 TeV results.
Presented by Nathan Edward TRIPLETT on 22 Nov 2012 at 12:00
Session: Evening Session
Track: Searches for Higgs
In the minimal super-symmetric extension of the Standard Model (MSSM), the Higgs sector contains two Higgs boson doublets, including, after electroweak symmetry breaking, the CP-odd neutral scalar A0, the two charged scalars H±, and the two CP-even neutral scalars h and H0. The results in the search for neutral and charged Higgs bosons with the CMS detector at LHC are presented, based on the da ... More
Presented by Federica PRIMAVERA on 22 Nov 2012 at 18:00
Session: Morning Session
Track: Searches for Phenomena beyond the Standard Model
We describe the search for signals from the production of right-handed W bosons and heavy neutrinos $N_l (l = e, \mu)$, that arise naturally in the left-right symmetric extension to the standard model, using 5 1/fb of collision data collected by the CMS Experiment at the LHC in 2011 at $\sqrt{s}=7$ TeV and 3.6 1/fb of 2012 collision data at $\sqrt{s}=8$ TeV. No excess over expectations from standa ... More
Presented by Mikhail KIRSANOV on 22 Nov 2012 at 11:30
Session: Evening Session
Track: Higgs Phenomenology and lessons from LHC results
Recent discovery of new like a Higgs boson at the LHC stimulated intensive discussions of many arising questions. To which extend the observed resonance corresponds to the SM Higgs, how to extract and measure properties of the resonance such as spin, P and C parities, what are implications to various BSM scenarios assuming not a SM nature of observed boson...? Short review of results of various ap ... More
Presented by Eduard BOOS on 22 Nov 2012 at 18:30
Session: Morning Session
Track: Status and plans of LHC machine
The report overviews present status of the Accelerator Complex U70 of IHEP-Protvino comprising four machines (2 linear accelerators and 2 synchrotrons). Particular emphasis is put on the recent upgrades aimed at improving quality of proton beam and implementing program to accelerate light ions (carbon).
Presented by Dr. Sergey IVANOV on 22 Nov 2012 at 09:00
Session: Morning Session
Track: Status and performance of the experiments
After the successful data taking year of 2011 at 7 TeV, since March of 2012 the ATLAS experiment at LHC is collecting data with colliding proton beams at the previously unparalleled centre of mass energy of 8 TeV. A challenging task was to cope with the augmented event rates due to the increased luminosity delivered by the collider and large pileup conditions. A status of the ATLAS detector is pre ... More
Presented by Oleg SOLOVYANOV on 20 Nov 2012 at 12:00
Session: Morning Session
Track: Status and performance of the experiments
The CMS experiment at the LHC collected 5.55 /fb of proton proton collisions data at a center of mass energy of 7 TeV in 2011 and almost 20 /fb at 8 TeV energy in 2012, while the LHC run is still ongoing. The CMS detector has shown excellent performance and very good data taking efficiency. The operational experience will be discussed focusing on relevant technical aspects. The performance of CMS ... More
Presented by Luigi GUIDUCCI on 20 Nov 2012 at 09:10
Session: Morning Session
Track: Higgs Phenomenology and lessons from LHC results
The recently discovered resonance at $125.7\, GeV$ in invariant mass distribution of $\gamma\, \gamma$ and of $l^+\,l^+\,l^-\,l^-$ may be tentatively interpreted as a scalar bound state $X$ consisting of two $W$. In the present note we consider this option and show that this interpretation agrees existing experimental data including the last LHC discovery and the $b \bar b$ bump reported by CDF ... More
Presented by Prof. Boris ARBUZOV on 22 Nov 2012 at 12:30
Session: Evening Session
Track: Top quark production and properties
This talk will be a review of the recent Atlas experimental results on top-quark Physics.
Presented by Saverio D'AURIA on 22 Nov 2012 at 14:00