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{"title":"First Indication of Solar8BNeutrinos through Coherent Elastic Neutrino-Nucleus Scattering in PandaX-4T","authors":"Zihao Boet al.(PandaX Collaboration)","doi":"10.1103/physrevlett.133.191001","DOIUrl":null,"url":null,"abstract":"The PandaX-4T liquid xenon detector at the China Jinping Underground Laboratory is used to measure the solar <mjx-container ctxtmenu_counter=\"242\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" overflow=\"linebreak\" role=\"tree\" sre-explorer- style=\"font-size: 100.7%;\" tabindex=\"0\"><mjx-math data-semantic-structure=\"(5 0 1 2 3 4)\"><mjx-mrow><mjx-mmultiscripts data-semantic-children=\"0,1,2,3,4\" data-semantic-collapsed=\"(5 0 1 2 3 4)\" data-semantic- data-semantic-owns=\"0 1 2 3 4\" data-semantic-role=\"latinletter\" data-semantic-speech=\"Superscript 8 Baseline normal upper B\" data-semantic-type=\"tensor\"><mjx-prescripts style=\"vertical-align: 0.363em;\"><mjx-row><mjx-cell><mjx-mrow size=\"s\"><mjx-mn data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"leftsuper\" data-semantic-type=\"number\"><mjx-c>8</mjx-c></mjx-mn></mjx-mrow></mjx-cell></mjx-row><mjx-row style=\"height: 0.602em;\"></mjx-row><mjx-row><mjx-cell><mjx-none data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"leftsub\" data-semantic-type=\"empty\" size=\"s\"></mjx-none></mjx-cell></mjx-row></mjx-prescripts><mjx-mrow><mjx-mi data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"latinletter\" data-semantic-type=\"identifier\"><mjx-c>B</mjx-c></mjx-mi></mjx-mrow><mjx-scripts style=\"vertical-align: 0.363em;\"><mjx-row><mjx-cell><mjx-none data-semantic-added=\"true\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"rightsuper\" data-semantic-type=\"empty\" size=\"s\"></mjx-none></mjx-cell></mjx-row><mjx-row style=\"height: 0.61em;\"></mjx-row><mjx-row><mjx-cell><mjx-none data-semantic-added=\"true\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"rightsub\" data-semantic-type=\"empty\" size=\"s\"></mjx-none></mjx-cell></mjx-row></mjx-scripts></mjx-mmultiscripts></mjx-mrow></mjx-math></mjx-container> neutrino flux by detecting neutrinos through coherent scattering with xenon nuclei. Data samples requiring the coincidence of scintillation and ionization signals (paired), as well as unpaired ionization-only signals (US2), are selected with energy threshold of approximately 1.1 keV (0.33 keV) nuclear recoil energy. Combining the commissioning run and the first science run of PandaX-4T, a total exposure of 1.20 and <mjx-container ctxtmenu_counter=\"243\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" overflow=\"linebreak\" role=\"tree\" sre-explorer- style=\"font-size: 100.7%;\" tabindex=\"0\"><mjx-math data-semantic-structure=\"(10 0 1 2 (6 3 4 5))\"><mjx-mrow data-semantic-children=\"0,1,2,6\" data-semantic-collapsed=\"(10 (c 7 8 9) 0 1 2 6)\" data-semantic- data-semantic-owns=\"0 1 2 6\" data-semantic-role=\"text\" data-semantic-speech=\"1.04 t o n n e dot y e a r\" data-semantic-type=\"punctuated\"><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"10\" data-semantic-role=\"float\" data-semantic-type=\"number\"><mjx-c noic=\"true\" style=\"padding-top: 0.645em;\">1</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.645em;\">.</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.645em;\">0</mjx-c><mjx-c style=\"padding-top: 0.645em;\">4</mjx-c></mjx-mn><mjx-mtext data-semantic-annotation=\"clearspeak:unit\" data-semantic- data-semantic-parent=\"10\" data-semantic-role=\"space\" data-semantic-type=\"text\" style='font-family: MJX-STX-ZERO, \"Helvetica Neue\", Helvetica, Roboto, Arial, sans-serif;'><mjx-utext style=\"font-size: 90.6%; padding: 0.828em 0px 0.221em; width: 3px;\" variant=\"-explicitFont\"> </mjx-utext></mjx-mtext><mjx-mtext data-semantic-annotation=\"clearspeak:unit\" data-semantic- data-semantic-parent=\"10\" data-semantic-role=\"space\" data-semantic-type=\"text\" style='font-family: MJX-STX-ZERO, \"Helvetica Neue\", Helvetica, Roboto, Arial, sans-serif;'><mjx-utext style=\"font-size: 90.6%; padding: 0.828em 0px 0.221em; width: 3px;\" variant=\"-explicitFont\"> </mjx-utext></mjx-mtext><mjx-mrow data-semantic-added=\"true\" data-semantic-children=\"3,5\" data-semantic-content=\"4\" data-semantic- data-semantic-owns=\"3 4 5\" data-semantic-parent=\"10\" data-semantic-role=\"multiplication\" data-semantic-type=\"infixop\"><mjx-mi data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"6\" data-semantic-role=\"unknown\" data-semantic-type=\"identifier\"><mjx-c noic=\"true\" style=\"padding-top: 0.61em;\">t</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.61em;\">o</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.61em;\">n</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.61em;\">n</mjx-c><mjx-c style=\"padding-top: 0.61em;\">e</mjx-c></mjx-mi><mjx-mo data-semantic- data-semantic-operator=\"infixop,·\" data-semantic-parent=\"6\" data-semantic-role=\"multiplication\" data-semantic-type=\"operator\" space=\"3\"><mjx-c>·</mjx-c></mjx-mo><mjx-mi data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"6\" data-semantic-role=\"unknown\" data-semantic-type=\"identifier\" space=\"3\"><mjx-c noic=\"true\" style=\"padding-top: 0.488em;\">y</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.488em;\">e</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.488em;\">a</mjx-c><mjx-c style=\"padding-top: 0.488em;\">r</mjx-c></mjx-mi></mjx-mrow></mjx-mrow></mjx-math></mjx-container> are collected for the paired and US2, respectively. After unblinding, 3 and 332 events are observed with an expectation of <mjx-container ctxtmenu_counter=\"244\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" overflow=\"linebreak\" role=\"tree\" sre-explorer- style=\"font-size: 100.7%;\" tabindex=\"0\"><mjx-math data-semantic-structure=\"(3 0 1 2)\"><mjx-mrow data-semantic-children=\"0,2\" data-semantic-content=\"1\" data-semantic- data-semantic-owns=\"0 1 2\" data-semantic-role=\"addition\" data-semantic-speech=\"2.8 plus or minus 0.5\" data-semantic-type=\"infixop\"><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"3\" data-semantic-role=\"float\" data-semantic-type=\"number\"><mjx-c noic=\"true\" style=\"padding-top: 0.647em;\">2</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.647em;\">.</mjx-c><mjx-c style=\"padding-top: 0.647em;\">8</mjx-c></mjx-mn><mjx-mo data-semantic- data-semantic-operator=\"infixop,±\" data-semantic-parent=\"3\" data-semantic-role=\"addition\" data-semantic-type=\"operator\" space=\"3\"><mjx-c>±</mjx-c></mjx-mo><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"3\" data-semantic-role=\"float\" data-semantic-type=\"number\" space=\"3\"><mjx-c noic=\"true\" style=\"padding-top: 0.642em;\">0</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.642em;\">.</mjx-c><mjx-c style=\"padding-top: 0.642em;\">5</mjx-c></mjx-mn></mjx-mrow></mjx-math></mjx-container> and <mjx-container ctxtmenu_counter=\"245\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" overflow=\"linebreak\" role=\"tree\" sre-explorer- style=\"font-size: 100.7%;\" tabindex=\"0\"><mjx-math breakable=\"true\" data-semantic-children=\"0,2\" data-semantic-content=\"1\" data-semantic- data-semantic-owns=\"0 1 2\" data-semantic-role=\"addition\" data-semantic-speech=\"251 plus or minus 32\" data-semantic-structure=\"(3 0 1 2)\" data-semantic-type=\"infixop\"><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"3\" data-semantic-role=\"integer\" data-semantic-type=\"number\"><mjx-c noic=\"true\" style=\"padding-top: 0.644em;\">2</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.644em;\">5</mjx-c><mjx-c style=\"padding-top: 0.644em;\">1</mjx-c></mjx-mn><mjx-break size=\"3\"></mjx-break><mjx-mo data-semantic- data-semantic-operator=\"infixop,±\" data-semantic-parent=\"3\" data-semantic-role=\"addition\" data-semantic-type=\"operator\"><mjx-c>±</mjx-c></mjx-mo><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"3\" data-semantic-role=\"integer\" data-semantic-type=\"number\" space=\"3\"><mjx-c noic=\"true\" style=\"padding-top: 0.644em;\">3</mjx-c><mjx-c style=\"padding-top: 0.644em;\">2</mjx-c></mjx-mn></mjx-math></mjx-container> background events, for the paired and US2 data, respectively. A combined analysis yields a best-fit <mjx-container ctxtmenu_counter=\"246\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" overflow=\"linebreak\" role=\"tree\" sre-explorer- style=\"font-size: 100.7%;\" tabindex=\"0\"><mjx-math data-semantic-structure=\"(5 0 1 2 3 4)\"><mjx-mrow><mjx-mmultiscripts data-semantic-children=\"0,1,2,3,4\" data-semantic-collapsed=\"(5 0 1 2 3 4)\" data-semantic- data-semantic-owns=\"0 1 2 3 4\" data-semantic-role=\"latinletter\" data-semantic-speech=\"Superscript 8 Baseline normal upper B\" data-semantic-type=\"tensor\"><mjx-prescripts style=\"vertical-align: 0.363em;\"><mjx-row><mjx-cell><mjx-mrow size=\"s\"><mjx-mn data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"leftsuper\" data-semantic-type=\"number\"><mjx-c>8</mjx-c></mjx-mn></mjx-mrow></mjx-cell></mjx-row><mjx-row style=\"height: 0.602em;\"></mjx-row><mjx-row><mjx-cell><mjx-none data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"leftsub\" data-semantic-type=\"empty\" size=\"s\"></mjx-none></mjx-cell></mjx-row></mjx-prescripts><mjx-mrow><mjx-mi data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"latinletter\" data-semantic-type=\"identifier\"><mjx-c>B</mjx-c></mjx-mi></mjx-mrow><mjx-scripts style=\"vertical-align: 0.363em;\"><mjx-row><mjx-cell><mjx-none data-semantic-added=\"true\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"rightsuper\" data-semantic-type=\"empty\" size=\"s\"></mjx-none></mjx-cell></mjx-row><mjx-row style=\"height: 0.61em;\"></mjx-row><mjx-row><mjx-cell><mjx-none data-semantic-added=\"true\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"rightsub\" data-semantic-type=\"empty\" size=\"s\"></mjx-none></mjx-cell></mjx-row></mjx-scripts></mjx-mmultiscripts></mjx-mrow></mjx-math></mjx-container> neutrino signal of 3.5 (75) events from the paired (US2) data sample, with <mjx-container ctxtmenu_counter=\"247\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" overflow=\"linebreak\" role=\"tree\" sre-explorer- style=\"font-size: 100.7%;\" tabindex=\"0\"><mjx-math breakable=\"true\" data-semantic-children=\"4,2\" data-semantic-content=\"2\" data-semantic- data-semantic-owns=\"4 2\" data-semantic-role=\"endpunct\" data-semantic-speech=\"tilde 37 percent sign\" data-semantic-structure=\"(5 (4 3 0 1) 2)\" data-semantic-type=\"punctuated\"><mjx-mrow data-semantic-added=\"true\" data-semantic-children=\"3,1\" data-semantic-content=\"0\" data-semantic- data-semantic-owns=\"3 0 1\" data-semantic-parent=\"5\" data-semantic-role=\"equality\" data-semantic-type=\"relseq\" inline-breaks=\"true\"><mjx-mrow data-semantic-added=\"true\" data-semantic- data-semantic-parent=\"4\" data-semantic-role=\"unknown\" data-semantic-type=\"empty\"></mjx-mrow><mjx-break size=\"0\"></mjx-break><mjx-mo data-semantic- data-semantic-operator=\"relseq,∼\" data-semantic-parent=\"4\" data-semantic-role=\"equality\" data-semantic-type=\"relation\"><mjx-c>∼</mjx-c></mjx-mo><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"4\" data-semantic-role=\"integer\" data-semantic-type=\"number\" space=\"4\"><mjx-c noic=\"true\" style=\"padding-top: 0.644em;\">3</mjx-c><mjx-c style=\"padding-top: 0.644em;\">7</mjx-c></mjx-mn></mjx-mrow><mjx-mo data-semantic- data-semantic-operator=\"punctuated\" data-semantic-parent=\"5\" data-semantic-role=\"unknown\" data-semantic-type=\"punctuation\"><mjx-c>%</mjx-c></mjx-mo></mjx-math></mjx-container> uncertainty, and the background-only hypothesis is disfavored at <mjx-container ctxtmenu_counter=\"248\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" overflow=\"linebreak\" role=\"tree\" sre-explorer- style=\"font-size: 100.7%;\" tabindex=\"0\"><mjx-math data-semantic-structure=\"(3 0 2 1)\"><mjx-mrow data-semantic-annotation=\"clearspeak:simple;clearspeak:unit\" data-semantic-children=\"0,1\" data-semantic-content=\"2\" data-semantic- data-semantic-owns=\"0 2 1\" data-semantic-role=\"implicit\" data-semantic-speech=\"2.64 sigma\" data-semantic-type=\"infixop\"><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"3\" data-semantic-role=\"float\" data-semantic-type=\"number\"><mjx-c noic=\"true\" style=\"padding-top: 0.646em;\">2</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.646em;\">.</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.646em;\">6</mjx-c><mjx-c style=\"padding-top: 0.646em;\">4</mjx-c></mjx-mn><mjx-mo data-semantic-added=\"true\" data-semantic- data-semantic-operator=\"infixop,\" data-semantic-parent=\"3\" data-semantic-role=\"multiplication\" data-semantic-type=\"operator\"><mjx-c></mjx-c></mjx-mo><mjx-mi data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"italic\" data-semantic- data-semantic-parent=\"3\" data-semantic-role=\"greekletter\" data-semantic-type=\"identifier\"><mjx-c>𝜎</mjx-c></mjx-mi></mjx-mrow></mjx-math></mjx-container> significance. This gives a solar <mjx-container ctxtmenu_counter=\"249\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" overflow=\"linebreak\" role=\"tree\" sre-explorer- style=\"font-size: 100.7%;\" tabindex=\"0\"><mjx-math data-semantic-structure=\"(5 0 1 2 3 4)\"><mjx-mrow><mjx-mmultiscripts data-semantic-children=\"0,1,2,3,4\" data-semantic-collapsed=\"(5 0 1 2 3 4)\" data-semantic- data-semantic-owns=\"0 1 2 3 4\" data-semantic-role=\"latinletter\" data-semantic-speech=\"Superscript 8 Baseline normal upper B\" data-semantic-type=\"tensor\"><mjx-prescripts style=\"vertical-align: 0.363em;\"><mjx-row><mjx-cell><mjx-mrow size=\"s\"><mjx-mn data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"leftsuper\" data-semantic-type=\"number\"><mjx-c>8</mjx-c></mjx-mn></mjx-mrow></mjx-cell></mjx-row><mjx-row style=\"height: 0.602em;\"></mjx-row><mjx-row><mjx-cell><mjx-none data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"leftsub\" data-semantic-type=\"empty\" size=\"s\"></mjx-none></mjx-cell></mjx-row></mjx-prescripts><mjx-mrow><mjx-mi data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"latinletter\" data-semantic-type=\"identifier\"><mjx-c>B</mjx-c></mjx-mi></mjx-mrow><mjx-scripts style=\"vertical-align: 0.363em;\"><mjx-row><mjx-cell><mjx-none data-semantic-added=\"true\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"rightsuper\" data-semantic-type=\"empty\" size=\"s\"></mjx-none></mjx-cell></mjx-row><mjx-row style=\"height: 0.61em;\"></mjx-row><mjx-row><mjx-cell><mjx-none data-semantic-added=\"true\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"rightsub\" data-semantic-type=\"empty\" size=\"s\"></mjx-none></mjx-cell></mjx-row></mjx-scripts></mjx-mmultiscripts></mjx-mrow></mjx-math></mjx-container> neutrino flux of <mjx-container ctxtmenu_counter=\"250\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" overflow=\"linebreak\" role=\"tree\" sre-explorer- style=\"font-size: 100.7%;\" tabindex=\"0\"><mjx-math data-semantic-structure=\"(30 (6 0 (5 1 2 3) 4) 7 (29 (10 8 9) 11 12 (17 13 (16 14 15)) 18 (23 19 (22 20 21))))\"><mjx-mrow data-semantic-children=\"6,29\" data-semantic-content=\"7\" data-semantic- data-semantic-owns=\"6 7 29\" data-semantic-role=\"multiplication\" data-semantic-speech=\"left parenthesis 8.4 plus or minus 3.1 right parenthesis times 10 Superscript 6 Baseline c m Superscript negative 2 Baseline normal s Superscript negative 1\" data-semantic-type=\"infixop\"><mjx-mrow data-semantic-children=\"5\" data-semantic-content=\"0,4\" data-semantic- data-semantic-owns=\"0 5 4\" data-semantic-parent=\"30\" data-semantic-role=\"leftright\" data-semantic-type=\"fenced\"><mjx-mo data-semantic- data-semantic-operator=\"fenced\" data-semantic-parent=\"6\" data-semantic-role=\"open\" data-semantic-type=\"fence\" style=\"vertical-align: -0.02em;\"><mjx-c>(</mjx-c></mjx-mo><mjx-mrow data-semantic-added=\"true\" data-semantic-children=\"1,3\" data-semantic-content=\"2\" data-semantic- data-semantic-owns=\"1 2 3\" data-semantic-parent=\"6\" data-semantic-role=\"addition\" data-semantic-type=\"infixop\"><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"float\" data-semantic-type=\"number\"><mjx-c noic=\"true\" style=\"padding-top: 0.647em;\">8</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.647em;\">.</mjx-c><mjx-c style=\"padding-top: 0.647em;\">4</mjx-c></mjx-mn><mjx-mo data-semantic- data-semantic-operator=\"infixop,±\" data-semantic-parent=\"5\" data-semantic-role=\"addition\" data-semantic-type=\"operator\" space=\"3\"><mjx-c>±</mjx-c></mjx-mo><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"float\" data-semantic-type=\"number\" space=\"3\"><mjx-c noic=\"true\" style=\"padding-top: 0.644em;\">3</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.644em;\">.</mjx-c><mjx-c style=\"padding-top: 0.644em;\">1</mjx-c></mjx-mn></mjx-mrow><mjx-mo data-semantic- data-semantic-operator=\"fenced\" data-semantic-parent=\"6\" data-semantic-role=\"close\" data-semantic-type=\"fence\" style=\"vertical-align: -0.02em;\"><mjx-c>)</mjx-c></mjx-mo></mjx-mrow><mjx-mo data-semantic- data-semantic-operator=\"infixop,×\" data-semantic-parent=\"30\" data-semantic-role=\"multiplication\" data-semantic-type=\"operator\" space=\"3\"><mjx-c>×</mjx-c></mjx-mo><mjx-mrow data-semantic-children=\"10,11,12,17,18,23\" data-semantic-collapsed=\"(29 (c 24 25 26 27 28) 10 11 12 17 18 23)\" data-semantic- data-semantic-owns=\"10 11 12 17 18 23\" data-semantic-parent=\"30\" data-semantic-role=\"text\" data-semantic-type=\"punctuated\" space=\"3\"><mjx-msup data-semantic-children=\"8,9\" data-semantic- data-semantic-owns=\"8 9\" data-semantic-parent=\"29\" data-semantic-role=\"integer\" data-semantic-type=\"superscript\"><mjx-mrow><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"10\" data-semantic-role=\"integer\" data-semantic-type=\"number\"><mjx-c noic=\"true\" style=\"padding-top: 0.642em;\">1</mjx-c><mjx-c style=\"padding-top: 0.642em;\">0</mjx-c></mjx-mn></mjx-mrow><mjx-script style=\"vertical-align: 0.369em;\"><mjx-mrow size=\"s\"><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"10\" data-semantic-role=\"integer\" data-semantic-type=\"number\"><mjx-c>6</mjx-c></mjx-mn></mjx-mrow></mjx-script></mjx-msup><mjx-mtext data-semantic-annotation=\"clearspeak:unit\" data-semantic- data-semantic-parent=\"29\" data-semantic-role=\"space\" data-semantic-type=\"text\" style='font-family: MJX-STX-ZERO, \"Helvetica Neue\", Helvetica, Roboto, Arial, sans-serif;'><mjx-utext style=\"font-size: 90.6%; padding: 0.828em 0px 0.221em; width: 3px;\" variant=\"-explicitFont\"> </mjx-utext></mjx-mtext><mjx-mtext data-semantic-annotation=\"clearspeak:unit\" data-semantic- data-semantic-parent=\"29\" data-semantic-role=\"space\" data-semantic-type=\"text\" style='font-family: MJX-STX-ZERO, \"Helvetica Neue\", Helvetica, Roboto, Arial, sans-serif;'><mjx-utext style=\"font-size: 90.6%; padding: 0.828em 0px 0.221em; width: 3px;\" variant=\"-explicitFont\"> </mjx-utext></mjx-mtext><mjx-msup data-semantic-children=\"13,16\" data-semantic- data-semantic-owns=\"13 16\" data-semantic-parent=\"29\" data-semantic-role=\"unknown\" data-semantic-type=\"superscript\"><mjx-mrow><mjx-mi data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"17\" data-semantic-role=\"unknown\" data-semantic-type=\"identifier\"><mjx-c noic=\"true\" style=\"padding-top: 0.485em;\">c</mjx-c><mjx-c style=\"padding-top: 0.485em;\">m</mjx-c></mjx-mi></mjx-mrow><mjx-script style=\"vertical-align: 0.363em;\"><mjx-mrow data-semantic-annotation=\"clearspeak:simple\" data-semantic-children=\"15\" data-semantic-content=\"14\" data-semantic- data-semantic-owns=\"14 15\" data-semantic-parent=\"17\" data-semantic-role=\"negative\" data-semantic-type=\"prefixop\" size=\"s\"><mjx-mo data-semantic- data-semantic-operator=\"prefixop,−\" data-semantic-parent=\"16\" data-semantic-role=\"subtraction\" data-semantic-type=\"operator\"><mjx-c>−</mjx-c></mjx-mo><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"16\" data-semantic-role=\"integer\" data-semantic-type=\"number\"><mjx-c>2</mjx-c></mjx-mn></mjx-mrow></mjx-script></mjx-msup><mjx-mtext data-semantic-annotation=\"clearspeak:unit\" data-semantic- data-semantic-parent=\"29\" data-semantic-role=\"space\" data-semantic-type=\"text\" style='font-family: MJX-STX-ZERO, \"Helvetica Neue\", Helvetica, Roboto, Arial, sans-serif;'><mjx-utext style=\"font-size: 90.6%; padding: 0.828em 0px 0.221em; width: 3px;\" variant=\"-explicitFont\"> </mjx-utext></mjx-mtext><mjx-msup data-semantic-children=\"19,22\" data-semantic- data-semantic-owns=\"19 22\" data-semantic-parent=\"29\" data-semantic-role=\"latinletter\" data-semantic-type=\"superscript\"><mjx-mrow><mjx-mi data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"23\" data-semantic-role=\"latinletter\" data-semantic-type=\"identifier\"><mjx-c>s</mjx-c></mjx-mi></mjx-mrow><mjx-script style=\"vertical-align: 0.363em;\"><mjx-mrow data-semantic-annotation=\"clearspeak:simple\" data-semantic-children=\"21\" data-semantic-content=\"20\" data-semantic- data-semantic-owns=\"20 21\" data-semantic-parent=\"23\" data-semantic-role=\"negative\" data-semantic-type=\"prefixop\" size=\"s\"><mjx-mo data-semantic- data-semantic-operator=\"prefixop,−\" data-semantic-parent=\"22\" data-semantic-role=\"subtraction\" data-semantic-type=\"operator\"><mjx-c>−</mjx-c></mjx-mo><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"22\" data-semantic-role=\"integer\" data-semantic-type=\"number\"><mjx-c>1</mjx-c></mjx-mn></mjx-mrow></mjx-script></mjx-msup></mjx-mrow></mjx-mrow></mjx-math></mjx-container>, consistent with the standard solar model prediction. It is also the first indication of solar <mjx-container ctxtmenu_counter=\"251\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" overflow=\"linebreak\" role=\"tree\" sre-explorer- style=\"font-size: 100.7%;\" tabindex=\"0\"><mjx-math data-semantic-structure=\"(5 0 1 2 3 4)\"><mjx-mrow><mjx-mmultiscripts data-semantic-children=\"0,1,2,3,4\" data-semantic-collapsed=\"(5 0 1 2 3 4)\" data-semantic- data-semantic-owns=\"0 1 2 3 4\" data-semantic-role=\"latinletter\" data-semantic-speech=\"Superscript 8 Baseline normal upper B\" data-semantic-type=\"tensor\"><mjx-prescripts style=\"vertical-align: 0.363em;\"><mjx-row><mjx-cell><mjx-mrow size=\"s\"><mjx-mn data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"leftsuper\" data-semantic-type=\"number\"><mjx-c>8</mjx-c></mjx-mn></mjx-mrow></mjx-cell></mjx-row><mjx-row style=\"height: 0.602em;\"></mjx-row><mjx-row><mjx-cell><mjx-none data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"leftsub\" data-semantic-type=\"empty\" size=\"s\"></mjx-none></mjx-cell></mjx-row></mjx-prescripts><mjx-mrow><mjx-mi data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"latinletter\" data-semantic-type=\"identifier\"><mjx-c>B</mjx-c></mjx-mi></mjx-mrow><mjx-scripts style=\"vertical-align: 0.363em;\"><mjx-row><mjx-cell><mjx-none data-semantic-added=\"true\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"rightsuper\" data-semantic-type=\"empty\" size=\"s\"></mjx-none></mjx-cell></mjx-row><mjx-row style=\"height: 0.61em;\"></mjx-row><mjx-row><mjx-cell><mjx-none data-semantic-added=\"true\" data-semantic- data-semantic-parent=\"5\" data-semantic-role=\"rightsub\" data-semantic-type=\"empty\" size=\"s\"></mjx-none></mjx-cell></mjx-row></mjx-scripts></mjx-mmultiscripts></mjx-mrow></mjx-math></mjx-container> neutrino “fog” in a dark matter direct detection experiment.","PeriodicalId":20069,"journal":{"name":"Physical review letters","volume":"9 1","pages":""},"PeriodicalIF":8.1000,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physical review letters","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1103/physrevlett.133.191001","RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"PHYSICS, MULTIDISCIPLINARY","Score":null,"Total":0}
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Abstract
The PandaX-4T liquid xenon detector at the China Jinping Underground Laboratory is used to measure the solar
8 B neutrino flux by detecting neutrinos through coherent scattering with xenon nuclei. Data samples requiring the coincidence of scintillation and ionization signals (paired), as well as unpaired ionization-only signals (US2), are selected with energy threshold of approximately 1.1 keV (0.33 keV) nuclear recoil energy. Combining the commissioning run and the first science run of PandaX-4T, a total exposure of 1.20 and
1 . 0 4 t o n n e · y e a r are collected for the paired and US2, respectively. After unblinding, 3 and 332 events are observed with an expectation of
2 . 8 ± 0 . 5 and
2 5 1 ± 3 2 background events, for the paired and US2 data, respectively. A combined analysis yields a best-fit
8 B neutrino signal of 3.5 (75) events from the paired (US2) data sample, with
∼ 3 7 % uncertainty, and the background-only hypothesis is disfavored at
2 . 6 4 𝜎 significance. This gives a solar
8 B neutrino flux of
( 8 . 4 ± 3 . 1 ) × 1 0 6 c m − 2 s − 1 , consistent with the standard solar model prediction. It is also the first indication of solar
8 B neutrino “fog” in a dark matter direct detection experiment.