This paper presents a summary of beam-induced backgrounds observed in the ATLAS detector and discusses methods to tag and remove background contaminated events in data. Trigger-rate based monitoring of beam-related backgrounds is presented. The correlations of backgrounds with machine conditions, such as residual pressure in the beam-pipe, are discussed. Results from dedicated beam-background simulations are shown, and their qualitative agreement with data is evaluated. Data taken during the passage of unpaired, i.e. non-colliding, proton bunches is used to obtain background-enriched data samples. These are used to identify characteristic features of beam-induced backgrounds, which then are exploited to develop dedicated background tagging tools. These tools, based on observables in the Pixel detector, the muon spectrometer and the calorimeters, are described in detail and their efficiencies are evaluated. Finally an example of an application of these techniques to a monojet analysis is given, which demonstrates the importance of such event cleaning techniques for some new physics searches.
Characterisation and mitigation of beam-induced backgrounds observed in the ATLAS detector during the 2011 proton-proton run
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Mechnich J; Mechtel M; Medinnis M; Meehan S; Meera-Lebbai R; Meguro T; Mehlhase S; Mehta A; Meier K; Meirose B; Melachrinos C; Garcia BRM; Meloni F; Navas LM; Meng Z; Mengarelli A; Menke S; Meoni E; Mercurio KM; Mermod P; Merola L; Meroni C; Merritt FS; Merritt H; Messina A; Metcalfe J; Mete AS; Meyer C; Meyer C; Meyer JP; Meyer J; Meyer J; Michal S; Micu L; Middleton RP; Migas S; Mijovic L; Mikenberg G; Mikestikova M; Mikuz M; Miller DW; Miller RJ; Mills WJ; Mills C; Milov A; Milstead DA; Milstein D; Minaenko AA; Moya MM; Minashvili IA; Mincer AI; Mindur B; Mineev M; Ming Y; Mir LM; Mirabelli G; Mitrevski J; Mitsou VA; Mitsui S; Miyagawa PS; Mjornmark JU; Moa T; Moeller V; Monig K; Moser N; Mohapatra S; Mohr W; Moles-Valls R; Molfetas A; Monk J; Monnier E; Berlingen JM; Monticelli F; Monzani S; Moore RW; Moorhead GF; Herrera CM; Moraes A; Morange N; Morel J; Morello G; Moreno D; Llacer MM; Morettini P; Morgenstern M; Morii M; Morley AK; Mornacchi G; Morris JD; Morvaj L; Moser HG; Mosidze M; Moss J; Mount R; Mountricha E; Mouraviev SV; Moyse EJW; Mueller F; Mueller K; Muller TA; Mueller T; Muenstermann D; Munwes Y; Murray WJ; Mussche I; Musto E; Myagkov AG; Myska M; Nackenhorst O; Nadal J; Nagai K; Nagai R; Nagano K; Nagarkar A; Nagasaka Y; Nagel M; Nairz AM; Nakahama Y; Nakamura K; Nakamura T; Nakano I; Nanava G; Napier A; Narayan R; Nash M; Nattermann T; Naumann T; Navarro G; Neal HA; Nechaeva PY; Neep TJ; Negri A; Negri G; Negrini M; Nektarijevic S; Nelson A; Nelson TK; Nemecek S; Nemethy P; Nepomuceno AA; Nessi M; Neubauer MS; Neumann M; Neusiedl A; Neves RM; Nevski P; Newcomer FM; Newman PR; Hong VNT; Nickerson RB; Nicolaidou R; Nicquevert B; Niedercorn F; Nielsen J; Nikiforou N; Nikiforov A; Nikolaenko V; Nikolic-Audit I; Nikolics K; Nikolopoulos K; Nilsen H; Nilsson P; Ninomiya Y; Nisati A; Nisius R; Nobe T; Nodulman L; Nomachi M; Nomidis I; Norberg S; Nordberg M; Norton PR; Novakova J; Nozaki M; Nozka L; Nugent IM; Nuncio-Quiroz AE; Hanninger GN; Nunnemann T; Nurse E; O'Brien BJ; O'Neil DC; O'Shea V; Oakes LB; Oakham FG; Oberlack H; Ocariz J; Ochi A; Oda S; Odaka S; Odier J; Ogren H; Oh A; Oh SH; Ohm CC; Ohshima T; Okamura W; Okawa H; Okumura Y; Okuyama T; Olariua A; Olchevski AG; Pino SAO; Oliveira M; Damazio DO; Garcia EO; Olivito D; Olszewski A; Olszowska J; Onofre A; Onyisi PUE; Oram CJ; Oregli MJ; Oren Y; Orestano D; Orlando N; Orlov I; Barrera CO; Orr RS; Osculati B; Ospanov R; Osuna C; Garzon GOY; Ottersbach JP; Ouchrif M; Ouellette EA; Ould-Saada F; Ouraou A; Ouyang Q; Ovcharova A; Owen M; Owen S; Ozcan VE; Ozturk N; Pages AP; Aranda CP; Griso SP; Paganis E; Pahl C; Paige F; Pais P; Pajchel K; Palacino G; Paleari CP; Palestini S; Pallin D; Palma A; Palmer JD; Pan YB; Panagiotopoulou E; Vazquez JGP; Pani P; Panikashvili N; Panitkin S; Pantea D; Papadelis A; Papadopoulou TD; Paramonov A; Hernandez DP; Park W; Parker MA; Parodi F; Parsons JA; Parzefall U; Pashapour S; Pasqualucci E; Passaggio S; Passeri A; Pastore F; Pastore F; Pasztor G; Pataraia S; Patel N; Pater JR; Patricelli S; Pauly T; Pecsy M; Lopez SP; Morales MIP; Peleganchuk SV; Pelikan D; Peng H; Penning B; Penson A; Penwell J; Perantoni M; Perez K; Cavalcanti TP; Codina EP; Garcia-Estan MTP; Reale VP; Perini L; Pernegger H; Perrino R; Perrodo P; Peshekhonov VD; Peters K; Petersen BA; Petersen J; Petersen TC; Petit E; Petridis A; Petridou C; Petrolo E; Petrucci F; Petschull D; Petteni M; Pezoa R; Phan A; Phillips PW; Piacquadio G; Picazio A; Piccaro E; Piccinini M; Piec SM; Piegaia R; Pignotti DT; Pilcher JE; Pilkington AD; Pina J; Pinamonti M; Pinder A; Pinfold JL; Pinto B; Pizio C; Plamondon M; Pleier MA; Plotnikova E; Poblaguev A; Poddar S; Podlyski F; Poggioli L; Pohl D; Pohl M; Polesello G; Policicchio A; Polini A; Poll J; Polychronakos V; Pomeroy D; Pommes K; Pontecorvo L; Pope BG; Popeneciu GA; Popovic DS; Poppleton A; Bueso XP; Pospelov GE; Pospisil S; Potrap IN; Potter CJ; Potter CT; Poulard G; Poveda J; Pozdnyakov V;