Knowledge of the material in the ATLAS inner tracking detector is crucial in under-standing the reconstruction of charged-particle tracks, the performance of algorithms that identify jets containing b-hadrons and is also essential to reduce background in searches for exotic particles that can decay within the inner detector volume. Interactions of primary hadrons produced in pp collisions with the material in the inner detector are used to map the location and amount of this material. The hadronic interactions of primary particles may result in secondary vertices, which in this analysis are reconstructed by an inclusive vertex-finding algorithm. Data were collected using minimum-bias triggers by the ATLAS detector operating at the LHC during 2010 at centre-of-mass energy root s = 7 TeV, and correspond to an integrated luminosity of 19 nb(-1). Kinematic properties of these secondary vertices are used to study the validity of the modelling of hadronic interactions in simulation. Secondary-vertex yields are compared between data and simulation over a volume of about 0.7m(3) around the interaction point, and agreement is found within overall uncertainties.
A measurement of material in the ATLAS tracker using secondary hadronic interactions in 7 TeV p p collisions
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Miller DW; Mills C; Milov A; Milstead DA; Minaenko AA; Minami Y; Minashvili IA; Mincer AI; Mindur B; Mineev M; Ming Y; Mir LM; Mistry KP; Mitani T; Mitrevski J; Mitsou VA; Miucci A; Miyagawa PS; MjRnmark JU; Moa T; Mochizuki K; Mohapatra S; Molander S; Moles Valls R; Monden R; Mondragon MC; Monig K; Monk J; Monnier E; Montalbano A; Berlingen JM; Monticelli F; Monzani S; Moore RW; Morange N; Moreno D; Llacer MM; Morettini P; Mori D; Mori T; Morii M; Morinaga M; Morisbak V; Moritz S; Morley AK; Mornacchi G; Morris JD; Mortensen SS; Morvaj L; Mosidze M; Moss J; Motohashi K; Mount R; Mountricha E; Mouraviev SV; Moyse EJW; Muanza S; Mudd RD; Mueller F; Mueller J; Mueller RSP; Mueller T; Muenstermann D; Mullen P; Mullier GA; Sanchez FJM; Quijada JAM; Murray WJ; Musheghyan H; Muskinja M; Myagkov AG; Myska M; Nachman BP; Nackenhorst O; Nagai K; Nagai R; Nagano K; Nagasaka Y; Nagata K; Nagel M; Nagy E; Nairz AM; Nakahama Y; Nakamura K; Nakamura T; Nakano I; Namasivayam H; Garcia RFN; Narayan R; Villar DIN; Naryshkin I; Naumann T; Navarro G; Nayyar R; Neal HA; Nechaeva PY; Neep TJ; Negri A; Negrini M; Nektarijevic S; Nellist C; Nelson A; Nemecek S; Nemethy P; Nepomuceno AA; Nessi M; Neubauer MS; Neumann M; Neves RM; Nevski P; Newman PR; Nguyen DH; Manh TN; Nickerson RB; Nicolaidou R; Nielsen J; Nikiforov A; Nikolaenko V; Nikolic Audit I; Nikolopoulos K; Nilsen JK; Nilsson P; Ninomiya Y; Nisati A; Nisius R; Nobe T; Nomachi M; Nomidis I; Nooney T; Norberg S; Nordberg M; Norjoharuddeen N; Novgorodova O; Nowak S; Nozaki M; Nozka L; Ntekas K; Nurse E; Nuti F; O'grady F; O'Neil DC; O'Rourke AA; O'Shea V; Oakham FG; Oberlack H; Obermann T; Ocariz J; Ochoa AOI; Ochoa Ricoux JP; Oda S; Odaka S; Ogren H; Oh A; Oh SH; Ohman CCOH; Ohman H; Okawa HOH; Okawa H; Okumura Y; Okuyama T; Olariu A; Seabra LFO; Pino SAO; Damazio DO; Olszewski A; Olszowska J; Onofre A; Onogi K; Onyisi PUE; Oreglia MJ; Oren Y; Orestano D; Orlando N; Orr RS; Osculati B; Ospanov R; Garzon GOY; Otono H; Ouchrif M; Ould Saada F; Ouraou A; Oussoren KP; Ouyang Q; Owen M; Owen RE; Ozcan VE; Ozturk N; Pachal K; Pages AP; Rodriguez LP; Aranda CP; Pagacova M; Griso SP; Paige F; Pais P; Pajchel K; Palacino G; Palazzo S; Palestini S; Palka M; Pallin D; Panagiotopoulou ES; Pandini CE; Vazquez JGP; Pani P; Panitkin S; Pantea D; Paolozzi L; Papadopoulou TD; Papageorgiou K; Paramonov A; Hernandez DP; Parker AJ; Parker MA; Parker KA; Parodi F; Parsons JA; Parzefall U; Pascuzzi VR; Pasqualucci E; Passaggio S; Pastore F; Pysztor G; Pataraia S; Pater JR; Pauly T; Pearce J; Pearson B; Pedersen LE; Pedersen M; Lopez SP; Pedro R; Peleganchuk SV; Penc O; Peng C; Peng H; Penwell J; Peralva BS; Perego MM; Perepelitsa DV; Codina EP; Perini L; Pernegger H; Perrella S; Peschke R; Peshekhonov VD; Peters K; Peters RFY; Petersen BA; Petersen TC; Petit E; Petridis A; Petridou C; Petroff P; Petrolo E; Petrov M; Petrucci F; Pettersson NE; Peyaud A; Pezoa R; Phillips PW; Piacquadio G; Pianori E; Picazio A; Piccaro E; Piccinini M; Pickering MA; Piegaia R; Pilcher JE; Pilkington AD; Pin AWJ; Pinamonti M; Pinfold JL; Pingel A; Pires S; Pirumov H; Pitt M; Plazak L; Pleier MA; Pleskot V; Plotnikova E; Plucinski P; Pluth D; Poettgen R; Poggioli L; Pohl D; Polesello G; Poley A; Policicchio A; Polifka R; Polini A; Pollard CS; Polychronakos V; Pommes K; Pontecorvo L; Pope BG; Popeneciu GA; Poppleton A; Pospisil S; Potamianos K; Potrap IN; Potter CJ; Potter CT; Poulard G; Poveda J; Pozdnyakov V; Astigarraga MEP; Pralavorio P; Pranko A; Prell S; Price D; Price LE; Primavera M; Prince S; Prokofiev K; Prokoshin F; Protopopescu S; Proudfoot J; Przybycien M; Puddu D; Purohit M; Puzo P; Qian J; Qin G; Quadt YQA; Quadt A; Quayle WB; Queitsch Maitland M; Quilty D; Raddum S; Radeka V; Radescu V; Radhakrishnan SK; Radloff P; Rados P; Ragusa F; Rahal G; Raine JA; Rajagopalan S; Rammensee M; Rangel Smith C; Ratti MG; Rauscher F; Rave S; Ravenscroft T; Ravinovich I; Raymond M; Read AL; Readioff NP; Reale M; Rebuzzi DM; Redelbach A; Redlinger G; Reece R; Reeves K; Rehnisch L; Reichert J; Reisin H; Rembser C; Ren H; Rescigno M; Resconi S; Rezanov OL; Reznicek P; Rezvani R; Richter R; Richter S; Richter Was E; Ricken O; Ridel M; Rieck P; Riegel CJ; Rieger J; Rifki O; Rijssenbeek M; Rimoldi A; Rimoldi M; Rinaldi L; Ristic B; Ritsch E; Riu I; Rizatdinova F; Rizvi E; Rizzi C; Robertson SH; Robichaud Veronneau A; Robinson D; Robinson JEM; Robson A; Roda C; Rodina Y; Perez AR; Rodriguez DR; Roe S; Rogan CS; Rohne O; Romaniouk A; Romano M; Saez SMR; Adam ER; Rompotis N; Ronzani M; Roos L; Ros E; Rosati S; Rosbach K; Rose P; Rosenthal O; Rosien NA; Rossetti V; Rossi E; Rossi LP; Rosten JHN; Rosten R; Rotaru M; Roth I;