LEPTON PAIRS

Determination of proton parton densities using early LHC data and of contrains on new physics beyond the Standard Model

Coordinatore	EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH    more  Organization address address: ROUTE DE MEYRIN CERN city: GENEVA 23 postcode: 1211 contact info Titolo: Mr. Nome: Seamus Cognome: Hegarty Email: send email Telefono: +41 22 767 27 55 Fax: +41 22 766 88 41
Nazionalità Coordinatore	Switzerland [CH]
Totale costo	0 €
EC contributo	189˙163 €
Programma	FP7-PEOPLE Specific programme "People" implementing the Seventh Framework Programme of the European Community for research, technological development and demonstration activities (2007 to 2013)
Code Call	FP7-PEOPLE-IIF-2008
Funding Scheme	MC-IIF
Anno di inizio	2009
Periodo (anno-mese-giorno)	2009-09-01   -   2011-08-31

 Partecipanti

#	participant	country	role	EC contrib. [€]
1	EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH  Organization address address: ROUTE DE MEYRIN CERN city: GENEVA 23 postcode: 1211 contact info Titolo: Mr. Nome: Seamus Cognome: Hegarty Email: send email Telefono: +41 22 767 27 55 Fax: +41 22 766 88 41	CH (GENEVA 23)	coordinator	189˙163.27

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 Obiettivo del progetto (Objective)

'The Large Hadron Collider (LHC) at CERN will collide protons at a centre-of-mass energy of 14 TeV. The combination of its high collision rate and centre-of-mass energy will make it possible to probe new interactions at very short distances. Such interactions might be revealed in the production of cross-sections of particles at very high transverse momentum as a deviation from the Standard Model. However, the sensitivity to new physics depends on experimental uncertainties in the measurements and on theoretical uncertainties in the Standard Model predictions. For instance, one could use single inclusive jet and lepton pair production cross-sections at low transverse momentum to constrain the parton density functions uncertainties at high transverse momentum. One of the goals of the project is to investigate by what kind of measurements or combination of measurements present theoretical an experimental uncertainties could be reduced. A particular difficulty at the LHC is the uncertainty on the luminosity of the data set used for the cross section measurement. Typically the main experimental uncertainties are due to the limited knowledge of the absolute energy scale (ES). In the case of an electron relevant for the measurement of lepton pair production, the ES can be deduced from reference reactions. In the case of jet cross section the situation is more difficult. In addition to the knowledge of the absolute ES, uncertainties arise from the non-perturbative hadronisation corrections necessary to connect the measurements to the calculation and from underlying events. The high precision measurements of lepton pairs produced at LHC will serve as a tool for understanding and calibrating the detector response. Moreover, one can extract the parton density information from the lepton pair production data and use it for the new physics effects searches.'