Journal ArticleMeasurement of the longitudinal diffusion of ionization electrons in the MicroBooNE detectorAbratenko, P.; An, R.; Anthony, J.; Asaadi, J.; Ashkenazi, A.; Balasubramanian, S.; Baller, B.; Barnes, C.; Barr, G.; Basque, V.; Bathe-Peters, L.; Benevides Rodrigues, O.; Berkman, S.; Bhanderi, A.; Bhat, A.; Bishai, M.; Blake, A.; Bolton, T.; Camilleri, L.; Caratelli, D.; Caro Terrazas, I.; Castillo Fernandez, R.; Cavanna, F.; Cerati, G.; Chen, Y.; Church, E.; Cianci, D.; Conrad, J.M.; Convery, M.; Cooper-Troendle, L.; Crespo-Anadón, J.I.; Del Tutto, M.; Dennis, S.R.; Devitt, D.; Diurba, R.; Dorrill, R.; Duffy, K.; Dytman, S.; Eberly, B.; Ereditato, A.; Evans, J.J.; Fine, R.; Fiorentini Aguirre, G.A.; Fitzpatrick, R.S.; Fleming, B.T.; Foppiani, N.; Franco, D.; Furmanski, A.P.; Garcia-Gamez, D.; Gardiner, S.; Ge, G.; Gollapinni, S.; Goodwin, O.; Gramellini, E.; Green, P.; Greenlee, H.; Gu, W.; Guenette, R.; Guzowski, P.; Hagaman, L.; Hall, E.; Hamilton, P.; Hen, O.; Horton-Smith, G.A.; Hourlier, A.; Itay, R.; James, C.; Ji, X.; Jiang, L.; Jo, J.H.; Johnson, R.A.; Jwa, Y.-J.; Kamp, N.; Kaneshige, N.; Karagiorgi, G.; Ketchum, W.; Kirby, M.; Kobilarcik, T.; Kreslo, I.; LaZur, R.; Lepetic, I.; Li, K.; Li, Y.; Lin, K.; Lister, A.; Littlejohn, B.R.; Louis, W.C.; Luo, X.; Manivannan, K.; Mariani, C.; Marsden, D.; Marshall, J.; Martinez Caicedo, D.A.; Mason, K.; Mastbaum, A.; McConkey, N.; Meddage, V.; Mettler, T.; Miller, K.; Mills, J.; Mistry, K.; Mogan, A.; Mohayai, T.; Moon, J.; Mooney, M.; Moor, A.F.; Moore, C.D.; Mora Lepin, L.; Mousseau, J.; Murphy, M.; Naples, D.; Navrer-Agasson, A.; Neely, R.K.; Nowak, J.; Nunes, M.; Palamara, O.; Paolone, V.; Papadopoulou, A.; Papavassiliou, V.; Pate, S.F.; Paudel, A.; Pavlovic, Z.; Piasetzky, E.; Ponce-Pinto, I.D.; Prince, S.; Qian, X.; Raaf, J.L.; Radeka, V.; Rafique, A.; Reggiani-Guzzo, M.; Ren, L.; Rice, L.C.J.; Rochester, L.; Rodriguez Rondon, J.; Rogers, H.E.; Rosenberg, M.; Ross-Lonergan, M.; Scanavini, G.; Schmitz, D.W.; Schukraft, A.; Seligman, W.; Shaevitz, M.H.; Sharankova, R.; Sinclair, J.; Smith, A.; Snider, E.L.; Soderberg, M.; Söldner-Rembold, S.; Spentzouris, P.; Spitz, J.; Stancari, M.; St. John, J.; Strauss, T.; Sutton, K.; Sword-Fehlberg, S.; Szelc, A.M.; Tagg, N.; Tang, W.; Terao, K.; Thorpe, C.; Totani, D.; Toups, M.; Tsai, Y.-T.; Uchida, M.A.; Usher, T.; Van De Pontseele, W.; Viren, B.; Weber, M.; Wei, H.; Williams, Z.; Wolbers, S.; Wongjirad, T.; Wospakrik, M.; Wright, N.; Wu, W.; Yandel, E.; Yang, T.; Yarbrough, G.; Yates, L.E.; Zeller, G.P.; Zennamo, J.; Zhang, C.Abstract Accurate knowledge of electron transport properties is vital to understanding the information provided by liquid argon time projection chambers (LArTPCs). Ionization electron drift-lifetime, local electric field distortions caused by positive ion accumulation, and electron diffusion can all significantly impact the measured signal waveforms. This paper presents a measurement of the effective longitudinal electron diffusion coefficient, D L , in MicroBooNE at the nominal electric field strength of 273.9 V/cm. Historically, this measurement has been made in LArTPC prototype detectors. This represents the first measurement in a large-scale (85 tonne active volume) LArTPC operating in a neutrino beam. This is the largest dataset ever used for this measurement. Using a sample of ∼70,000 through-going cosmic ray muon tracks tagged with MicroBooNE's cosmic ray tagger system, we measure D L = 3.74 +0.28 -0.29 cm 2 /s.2021-09-0110320547Journal of Instrumentation16091748-0221https://doi.org/10.1088/1748-0221/16/09/P090251801996National Science Foundation