The Korean Physical Society 06130 22, Teheran-ro 7-gil, Gangnam-gu, Seoul, Republic of Korea 610 Representation : Tae Won NOH TEL: 02-556-4737 FAX: 02-554-1643 E-mail : webmaster@kps.or.kr Copyright(C) KPS, All rights reserved.

# The XXX International Conference on Neutrino Physics and Astrophysics (Neutrino 2022)

30 May 2022 to 4 June 2022
Virtual Seoul
Asia/Seoul timezone

## Measurement of the Electron Neutrino Charged-Current Pion Production Cross Section the T2K Near Detector

Not scheduled
20m
Virtual Seoul

#### Virtual Seoul

Poster Neutrino interactions

### Description

T2K is a long-baseline neutrino experiment in Japan which aims to constrain parameters of the Pontecorvo–Maki–Nakagawa–Sakata (PMNS) matrix by studying $\nu_{\mu} \rightarrow \nu_{e}~(\bar{\nu}_{\mu} \rightarrow \bar{\nu}_{e})$ oscillations. Measurements of neutrino oscillations require an accurate understanding of how neutrinos interact with matter. One significant $\text{CC} \nu_{e}$ channel which contributes to $\nu_{e}$ appearance at T2K is $\pi^{+}$ production, for which there is currently no exclusive cross-section measurement on a carbon target. This interaction also contributes to the $\nu_{e}$ appearance at NOvA and will be present at next-generation long-baseline experiments including Hyper-Kamiokande and DUNE. The $\nu_{e} \pi^{+}$ channel is also of significance because there is an observed event excess in reconstructed neutrino energy at the Super-Kamiokande far detector sample, where 15.0 events are observed with 7.8 predicted using Monte-Carlo (MC) generators [1]. This discrepancy may be resolved with higher statistics as T2K collects more data, but it could also indicate an issue with the cross-section models used for generating MC events. A constraint of the $\nu_{e} \pi^{+}$ event rate at the T2K near detector (ND280) could address this issue; ND280 also has the purpose of measuring neutrino cross-sections. In the ND280 tracker, the beam is largely $\nu_{\mu}$-dominated, but some $\nu_{e}$ interactions do occur in its fiducial volume. Measuring $\nu_{e}$ cross-sections at ND280 is difficult because charged-current $\nu_{e}$ events are relatively rare, and there are several large backgrounds which can produce electrons and mimic the $\text{CC} \nu_{e}$ signal such as $\pi^{0}$ interactions. This poster will present the status of the analysis and detail the strategies for the main developments so far, focusing on the challenging selection development and detector systematics estimation.

[1] K. Abe et al. (T2K Collaboration) Phys. Rev. D 103, 112008 (2021).

Collaboration T2K

### Primary author

Nick Latham (University of Warwick)
{"extraction_info": {"found_math": true, "script_math_tex": 0, "script_math_asciimath": 0, "math_annotations": 0, "math_alttext": 0, "mathml": 0, "mathjax_tag": 0, "mathjax_inline_tex": 1, "mathjax_display_tex": 0, "mathjax_asciimath": 0, "img_math": 0, "codecogs_latex": 0, "wp_latex": 0, "mimetex.cgi": 0, "/images/math/codecogs": 0, "mathtex.cgi": 0, "katex": 0, "math-container": 0, "wp-katex-eq": 0, "align": 0, "equation": 0, "x-ck12": 0, "texerror": 0, "math_score": 0.7950006723403931, "perplexity": 4551.076363887309}, "config": {"markdown_headings": true, "markdown_code": true, "boilerplate_config": {"ratio_threshold": 0.18, "absolute_threshold": 20, "end_threshold": 15, "enable": true}, "remove_buttons": true, "remove_image_figures": true, "remove_link_clusters": true, "table_config": {"min_rows": 2, "min_cols": 3, "format": "plain"}, "remove_chinese": true, "remove_edit_buttons": true, "extract_latex": true}, "warc_path": "s3://commoncrawl/crawl-data/CC-MAIN-2022-33/segments/1659882573533.87/warc/CC-MAIN-20220818215509-20220819005509-00194.warc.gz"}