Knowledge

Neutralino

Source đź“ť

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In models in which R-parity is conserved and the lightest of the four neutralinos is the LSP, the lightest neutralino is stable and is eventually produced in the decay chain of all other superpartners. In such cases supersymmetric processes at accelerators are characterized by the expectation of a
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Neutralino dark matter could be observed experimentally in nature either indirectly or directly. For indirect observation, gamma ray and neutrino telescopes look for evidence of neutralino annihilation in regions of high dark matter density such as the galactic or solar centre. For direct
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The exact properties of each neutralino will depend on the details of the mixing (e.g. whether they are more higgsino-like or gaugino-like), but they tend to have masses at the weak scale (100 GeV ~ 1 TeV) and couple to other particles with strengths characteristic of the
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large discrepancy in energy and momentum between the visible initial and final state particles, with this energy being carried off by a neutralino which departs the detector unnoticed. This is an important signature to discriminate supersymmetry from Standard Model backgrounds.
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conserving models, the lightest neutralino is stable and all supersymmetric cascade-decays end up decaying into this particle which leaves the detector unseen and its existence can only be inferred by looking for unbalanced momentum in a detector.
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of the mass operator called "neutralinos". In many models the lightest of the four neutralinos turns out to be the
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The mass splittings between the different neutralinos will dictate which patterns of decays are allowed.
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As a heavy, stable particle, the lightest neutralino is an excellent candidate to form the universe's
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Feng, Jonathan L. (2010). "Dark Matter Candidates from Particle Physics and Methods of Detection".
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Martin, Stephen P. (2010). "Chapter 1: A Supersymmetry Primer". In Kane, Gordon L. (ed.).
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Up to present, neutralinos have never been observed or detected in an experiment.
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and leave approximately the right relic abundance to account for the observed
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Neutral mass eigenstate formed from superpartners of gauge and Higgs bosons
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and are electrically neutral, the lightest of which is stable in an
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in copious numbers. They would primarily appear as particles in
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If they exist, these particles would only interact with the
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from its partner particle. Since the superpartners of the
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The heavier neutralinos typically decay through a neutral
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Particle Dark Matter: Observations, Models and Searches
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conserved scenario of MSSM. They are typically labeled
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Martin, Stephen P. (2008). "A Supersymmetry Primer".
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observation, special purpose experiments such as the
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A lightest neutralino of roughly 505:, each of them is identical to its 493:(which are the neutral electroweak 235:is a hypothetical particle. In the 13: 947:Origins in supersymmetric theories 331:(the heaviest) although sometimes 14: 3200: 3189:Hypothetical elementary particles 1267:Bertone, Gianfranco, ed. (2010). 533:supersymmetric particles such as 3145: 3134: 3133: 2541: 2429: 2322:Timeline of particle discoveries 1088:Lightest supersymmetric particle 1012: 1007:lightest supersymmetric particle 2475: 3101:Galaxy formation and evolution 1330: 1291: 1172: 1142: 1139:Also published in Kane (2010). 1083:List of hypothetical particles 1065:(WIMP) dark matter candidate. 959:except for the quantum number 419: 378: 345: 1: 1181:Perspectives on Supersymmetry 1105: 951:In supersymmetry models, all 2523:Self-interacting dark matter 2338:History of subatomic physics 1071:Cryogenic Dark Matter Search 7: 2681:Navarro–Frenk–White profile 2671:Massive compact halo object 2666:Mass dimension one fermions 1337:Nakamura, K.; et al. ( 1149:Nakamura, K.; et al. ( 1076: 1034:Relationship to dark matter 10: 3205: 1301:; Olive, Keith A. (2010). 1275:Cambridge University Press 18: 3129: 3078: 3044: 3019: 2931: 2703: 2694: 2611: 2550: 2539: 2483: 2427: 2330: 2294: 2211: 2172: 2142: 2116: 2112: 2103: 2035: 2003: 1930: 1865: 1847: 1743: 1698: 1670: 1661: 1652: 1634: 1612: 1584: 1575: 1491: 1418: 1409: 1400: 642: 501:. As the neutralinos are 215: 205: 195: 171: 161: 151: 143: 129: 39: 31: 2686:Scalar field dark matter 2528:Scalar field dark matter 2355:mathematical formulation 1950:Eta and eta prime mesons 19:Not to be confused with 2017:Double-charm tetraquark 1235:2010ARA&A..48..495F 2551:Hypothetical particles 2533:Primordial black holes 1094:Truly neutral particle 440: 399: 137:truly neutral particle 2636:Dark globular cluster 2414:Wave–particle duality 2404:Relativistic particle 1541:Electron antineutrino 560:to a light chargino: 441: 400: 2656:Dwarf galaxy problem 2578:Minicharged particle 2493:Baryonic dark matter 1644:Faddeev–Popov ghosts 1394:Particles in physics 1350:Journal of Physics G 1162:Journal of Physics G 446:is used to refer to 409: 335: 163:Electric charge 2419:Particle chauvinism 2362:Subatomic particles 1339:Particle Data Group 1323:2010pdmo.book..142E 1151:Particle Data Group 963:, which differs by 497:), and the neutral 435: 394: 361: 28: 2661:Halo mass function 2621:Cuspy halo problem 1044:hot early universe 519:weak vector bosons 455:(In this article, 436: 412: 405:is also used when 395: 371: 338: 207:Baryon number 197:Lepton number 26: 3161: 3160: 3106:Illustris project 3040: 3039: 2513:Mixed dark matter 2508:Light dark matter 2443: 2442: 2399:Massless particle 2207: 2206: 2203: 2202: 2168: 2167: 2031: 2030: 1843: 1842: 1839: 1838: 1791:Magnetic monopole 1739: 1738: 1630: 1629: 1571: 1570: 1551:Muon antineutrino 1536:Electron neutrino 1284:978-0-521-76368-4 1194:978-981-4307-48-2 936: 935: 513:Expected behavior 503:Majorana fermions 422: 381: 348: 225: 224: 157:> 300 GeV 3196: 3149: 3148: 3137: 3136: 2701: 2700: 2641:Dark matter halo 2588:Sterile neutrino 2545: 2544: 2518:Warm dark matter 2498:Cold dark matter 2470: 2463: 2456: 2447: 2446: 2433: 2409:Virtual particle 2180:Mesonic molecule 2114: 2113: 2110: 2109: 1955:Bottom eta meson 1863: 1862: 1854: 1853: 1826:W′ and Z′ bosons 1816:Sterile neutrino 1801:Majorana fermion 1668: 1667: 1659: 1658: 1582: 1581: 1561:Tau antineutrino 1416: 1415: 1407: 1406: 1387: 1380: 1373: 1364: 1363: 1358: 1357: 1347: 1334: 1328: 1326: 1316: 1295: 1289: 1288: 1264: 1255: 1254: 1228: 1208: 1199: 1198: 1185:World Scientific 1183:. Vol. II. 1176: 1170: 1169: 1159: 1146: 1140: 1138: 1136: 1134:hep-ph/9709356v5 1124: 1060: 1055: 1040:cold dark matter 1020:weak interaction 972: 971: 967: 932: 928: 923: 922: 921: 920: 913: 912: 899: 892: 891: 890: 889: 882: 881: 864: 858: 857: 856: 855: 848: 847: 834: 833: 832: 831: 824: 823: 810: 809: 808: 807: 799: 798: 787: 781: 780: 779: 778: 771: 770: 757: 756: 755: 754: 746: 745: 734: 728: 727: 726: 725: 717: 716: 704: 703: 701: 700: 693: 692: 678: 677: 675: 674: 667: 666: 648: 640: 639: 638: 637: 630: 629: 616: 615: 614: 613: 605: 604: 593: 587: 586: 585: 584: 576: 575: 565: 564: 523:hadron colliders 489:and the neutral 481: 475: 474: 473: 472: 464: 463: 445: 443: 442: 437: 434: 429: 424: 423: 415: 404: 402: 401: 396: 393: 388: 383: 382: 374: 360: 355: 350: 349: 341: 330: 329: 328: 327: 319: 318: 309: 308: 307: 306: 298: 297: 288: 287: 286: 285: 277: 276: 268:(the lightest), 267: 266: 265: 264: 256: 255: 191: 189: 188: 185: 182: 125: 124: 123: 122: 114: 113: 104: 103: 102: 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3056: 3053: 3052: 3050: 3048: 3047:dark galaxies 3043: 3033: 3030: 3028: 3025: 3024: 3022: 3018: 3012: 3009: 3007: 3004: 3002: 2999: 2997: 2994: 2992: 2989: 2987: 2984: 2982: 2979: 2977: 2974: 2972: 2969: 2967: 2964: 2962: 2959: 2957: 2954: 2952: 2949: 2947: 2944: 2942: 2939: 2938: 2936: 2930: 2924: 2921: 2919: 2916: 2914: 2911: 2909: 2906: 2904: 2901: 2899: 2896: 2894: 2891: 2889: 2886: 2884: 2881: 2879: 2876: 2874: 2871: 2869: 2866: 2864: 2861: 2859: 2856: 2854: 2851: 2849: 2846: 2844: 2841: 2839: 2836: 2834: 2831: 2829: 2826: 2824: 2821: 2819: 2816: 2814: 2811: 2809: 2806: 2804: 2801: 2799: 2796: 2794: 2791: 2789: 2786: 2784: 2781: 2779: 2776: 2774: 2771: 2769: 2766: 2764: 2761: 2759: 2756: 2754: 2751: 2749: 2746: 2744: 2741: 2739: 2736: 2734: 2731: 2729: 2726: 2724: 2721: 2719: 2716: 2714: 2711: 2710: 2708: 2702: 2699: 2693: 2687: 2684: 2682: 2679: 2677: 2676:Mirror matter 2674: 2672: 2669: 2667: 2664: 2662: 2659: 2657: 2654: 2652: 2649: 2647: 2644: 2642: 2639: 2637: 2634: 2632: 2629: 2627: 2624: 2622: 2619: 2618: 2616: 2610: 2604: 2601: 2599: 2596: 2594: 2591: 2589: 2586: 2584: 2581: 2579: 2576: 2574: 2571: 2569: 2566: 2564: 2561: 2559: 2556: 2555: 2553: 2549: 2534: 2531: 2529: 2526: 2524: 2521: 2519: 2516: 2514: 2511: 2509: 2506: 2504: 2501: 2499: 2496: 2494: 2491: 2490: 2488: 2482: 2478: 2471: 2466: 2464: 2459: 2457: 2452: 2451: 2448: 2438: 2437: 2432: 2426: 2420: 2417: 2415: 2412: 2410: 2407: 2405: 2402: 2400: 2397: 2395: 2394:Exotic matter 2392: 2388: 2385: 2384: 2383: 2382:Eightfold way 2380: 2378: 2375: 2373: 2372:Antiparticles 2370: 2368: 2365: 2363: 2360: 2356: 2353: 2352: 2351: 2348: 2344: 2341: 2340: 2339: 2336: 2335: 2333: 2329: 2323: 2320: 2318: 2315: 2313: 2310: 2308: 2305: 2303: 2300: 2299: 2297: 2293: 2287: 2284: 2282: 2279: 2277: 2274: 2272: 2269: 2267: 2264: 2262: 2259: 2257: 2254: 2252: 2249: 2247: 2244: 2242: 2239: 2237: 2234: 2232: 2229: 2227: 2224: 2222: 2219: 2218: 2216: 2214: 2210: 2196: 2193: 2191: 2188: 2186: 2183: 2181: 2178: 2177: 2175: 2171: 2161: 2158: 2156: 2153: 2151: 2148: 2147: 2145: 2141: 2135: 2132: 2130: 2127: 2125: 2122: 2121: 2119: 2115: 2111: 2108: 2106: 2102: 2096: 2093: 2091: 2088: 2084: 2081: 2079: 2076: 2074: 2071: 2069: 2066: 2064: 2061: 2059: 2056: 2055: 2054: 2051: 2049: 2046: 2044: 2043:Atomic nuclei 2041: 2040: 2038: 2034: 2024: 2021: 2018: 2014: 2011: 2010: 2008: 2006: 2002: 1996: 1993: 1991: 1988: 1986: 1983: 1981: 1978: 1976: 1975:Upsilon meson 1973: 1971: 1968: 1966: 1963: 1961: 1958: 1956: 1953: 1951: 1948: 1946: 1943: 1941: 1938: 1937: 1935: 1933: 1929: 1923: 1920: 1918: 1915: 1913: 1910: 1908: 1907:Lambda baryon 1905: 1903: 1900: 1896: 1893: 1891: 1888: 1886: 1883: 1881: 1878: 1877: 1876: 1873: 1872: 1870: 1868: 1864: 1861: 1859: 1855: 1852: 1850: 1846: 1832: 1829: 1827: 1824: 1822: 1819: 1817: 1814: 1812: 1809: 1807: 1804: 1802: 1799: 1797: 1794: 1792: 1789: 1787: 1784: 1782: 1779: 1777: 1774: 1772: 1769: 1767: 1766:Dual graviton 1764: 1762: 1759: 1757: 1754: 1752: 1749: 1748: 1746: 1742: 1731: 1727: 1724: 1722: 1719: 1717: 1714: 1712: 1709: 1707: 1704: 1703: 1701: 1697: 1691: 1688: 1686: 1683: 1681: 1678: 1677: 1675: 1673: 1669: 1666: 1664: 1663:Superpartners 1660: 1657: 1655: 1651: 1645: 1642: 1641: 1639: 1637: 1633: 1623: 1620: 1619: 1617: 1615: 1611: 1605: 1602: 1600: 1597: 1595: 1592: 1591: 1589: 1587: 1583: 1580: 1578: 1574: 1562: 1559: 1557: 1554: 1552: 1549: 1547: 1546:Muon neutrino 1544: 1542: 1539: 1537: 1534: 1533: 1532: 1529: 1527: 1524: 1522: 1519: 1517: 1514: 1512: 1509: 1507: 1504: 1502: 1499: 1498: 1496: 1494: 1490: 1484: 1481: 1479: 1478:Bottom (quark 1476: 1474: 1471: 1469: 1466: 1464: 1461: 1459: 1456: 1454: 1451: 1449: 1446: 1444: 1441: 1439: 1436: 1434: 1431: 1429: 1426: 1425: 1423: 1421: 1417: 1414: 1412: 1408: 1405: 1403: 1399: 1395: 1388: 1383: 1381: 1376: 1374: 1369: 1368: 1365: 1355: 1351: 1344: 1343:"Dark Matter" 1340: 1333: 1324: 1320: 1315: 1310: 1306: 1305: 1300: 1294: 1286: 1280: 1276: 1272: 1271: 1263: 1261: 1252: 1248: 1244: 1240: 1236: 1232: 1227: 1222: 1218: 1214: 1207: 1205: 1196: 1190: 1186: 1182: 1175: 1167: 1163: 1156: 1152: 1145: 1135: 1130: 1123: 1121: 1119: 1117: 1115: 1110: 1101: 1098: 1095: 1092: 1089: 1086: 1084: 1081: 1080: 1074: 1072: 1066: 1064: 1059: 1049: 1045: 1041: 1031: 1027: 1025: 1021: 1013:Phenomenology 1010: 1008: 1004: 1001:to form four 1000: 996: 992: 991:neutral higgs 988: 984: 980: 976: 962: 958: 954: 944: 941: 904: 901: 873: 870: 867: 860: 839: 836: 815: 812: 790: 783: 762: 759: 737: 730: 708: 707: 702: 683: 680: 676: 657: 654: 651: 644: 621: 618: 596: 589: 567: 566: 563: 562: 561: 559: 555: 550: 547: 542: 540: 536: 532: 528: 524: 520: 510: 508: 504: 500: 496: 492: 488: 479: 453: 452: 451: 449: 431: 426: 416: 390: 385: 375: 368: 365: 362: 357: 352: 342: 246: 242: 238: 234: 230: 229:supersymmetry 220: 218: 217:R parity 214: 210: 208: 204: 200: 198: 194: 176: 174: 170: 166: 164: 160: 156: 154: 150: 146: 142: 138: 134: 132: 128: 42: 38: 34: 30: 22: 3150: 3138: 2582: 2434: 2105:Hypothetical 2053:Exotic atoms 1922:Omega baryon 1912:Sigma baryon 1902:Delta baryon 1720: 1654:Hypothetical 1636:Ghost fields 1622:Higgs boson 1556:Tau neutrino 1448:Charm (quark 1353: 1349: 1332: 1303: 1293: 1269: 1216: 1212: 1180: 1174: 1165: 1161: 1144: 1067: 1037: 1028: 1016: 950: 942: 939: 551: 543: 516: 507:antiparticle 484: 476:is used for 232: 226: 131:Antiparticle 35:Hypothetical 3174:Dark matter 3091:Dark energy 3055:HE0450-2958 2697:experiments 2631:Dark galaxy 2614:and objects 2568:Dark photon 2486:dark matter 2477:Dark matter 2387:Quark model 2155:Theta meson 2058:Positronium 1970:Omega meson 1965:J/psi meson 1895:Antineutron 1806:Dark photon 1771:Graviphoton 1730:Stop squark 1438:Down (quark 1299:Ellis, John 1219:: 495–545. 1048:dark matter 1003:eigenstates 3168:Categories 3086:Antimatter 3045:Potential 2773:DAMA/LIBRA 2626:Dark fluid 2583:Neutralino 2129:Heptaquark 2090:Superatoms 2023:Pentaquark 2013:Tetraquark 1995:Quarkonium 1885:Antiproton 1786:Leptoquark 1721:Neutralino 1483:antiquark) 1473:antiquark) 1468:Top (quark 1463:antiquark) 1453:antiquark) 1443:antiquark) 1433:antiquark) 1402:Elementary 1341:) (2010). 1153:) (2010). 1106:References 989:) and the 480:#1, etc.) 233:neutralino 27:Neutralino 3070:VIRGOHI21 3027:MultiDark 2934:detection 2818:EDELWEISS 2706:detection 2651:Dark star 2367:Particles 2312:Particles 2271:Polariton 2261:Plasmaron 2231:Dropleton 2124:Hexaquark 2095:Molecules 2083:Protonium 1960:Phi meson 1945:Rho meson 1917:Xi baryon 1849:Composite 1685:Gravitino 1428:Up (quark 1314:1001.3651 1226:1003.0904 1024:neutrinos 499:higgsinos 448:charginos 432:± 420:~ 417:χ 379:~ 376:χ 366:… 346:~ 343:χ 3179:Fermions 3140:Category 2932:Indirect 2788:DarkSide 2778:DAMA/NaI 2612:Theories 2484:Forms of 2343:timeline 2195:R-hadron 2150:Glueball 2134:Skyrmion 2068:Tauonium 1781:Inflaton 1776:Graviton 1756:Curvaton 1726:Sfermion 1716:Higgsino 1711:Chargino 1672:Gauginos 1531:Neutrino 1516:Antimuon 1506:Positron 1501:Electron 1411:Fermions 1251:11972078 1077:See also 995:higgsino 800:N͂ 747:C͂ 718:N͂ 606:N͂ 577:N͂ 546:R-parity 495:gauginos 478:chargino 465:C͂ 320:N͂ 299:N͂ 278:N͂ 257:N͂ 245:R-parity 241:fermions 221:−1 115:N͂ 94:N͂ 73:N͂ 52:N͂ 21:neutrino 3152:Commons 3079:Related 3011:VERITAS 2986:IceCube 2946:ANTARES 2898:TREX-DM 2883:ROSEBUD 2873:PICASSO 2331:Related 2302:Baryons 2276:Polaron 2266:Plasmon 2241:Fracton 2236:Exciton 2190:Diquark 2185:Pomeron 2160:T meson 2117:Baryons 2078:Pionium 2063:Muonium 1990:D meson 1985:B meson 1890:Neutron 1875:Nucleon 1867:Baryons 1858:Hadrons 1821:Tachyon 1796:Majoron 1761:Dilaton 1690:Photino 1526:Antitau 1493:Leptons 1319:Bibcode 1231:Bibcode 987:photino 981:), the 975:Z boson 968:⁄ 865:  861:  788:  784:  735:  731:  649:  645:  594:  590:  558:W boson 554:Z boson 539:gluinos 535:squarks 531:colored 190:⁠ 178:⁠ 3006:PAMELA 2941:AMS-02 2923:ZEPLIN 2893:SIMPLE 2868:PandaX 2863:NEWS-G 2858:NEWAGE 2823:EURECA 2803:DM-Ice 2793:DARWIN 2758:CRESST 2748:COSINE 2743:CoGeNT 2704:Direct 2695:Search 2307:Mesons 2256:Phonon 2251:Magnon 2173:Others 2143:Mesons 2036:Others 1932:Mesons 1880:Proton 1744:Others 1699:Others 1680:Gluino 1614:Scalar 1594:Photon 1577:Bosons 1420:Quarks 1281:  1249:  1191:  1056:  983:photon 927:ν 895:ν 231:, the 135:self ( 40:Symbol 32:Status 3032:PVLAS 2991:MAGIC 2971:Fermi 2966:DAMPE 2956:CALET 2918:XMASS 2913:XENON 2903:UKDMC 2888:SABRE 2853:NAIAD 2848:MIMAC 2843:MACRO 2813:DRIFT 2808:DMTPC 2783:DAMIC 2763:CUORE 2753:COUPP 2738:CLEAN 2718:ANAIS 2563:Axion 2558:Axino 2295:Lists 2286:Trion 2281:Roton 2221:Anyon 2048:Atoms 1811:Preon 1751:Axion 1706:Axino 1599:Gluon 1586:Gauge 1346:(PDF) 1309:arXiv 1247:S2CID 1221:arXiv 1158:(PDF) 1129:arXiv 1052:10–10 144:Types 3001:OGLE 2981:HESS 2976:HAWC 2961:CAST 2951:ATIC 2908:WARP 2878:PICO 2828:KIMS 2798:DEAP 2733:CDMS 2728:CDEX 2723:ArDM 2713:ADMX 2603:WISP 2598:WIMP 2593:SIMP 2246:Hole 2073:Onia 1980:Kaon 1940:Pion 1511:Muon 1279:ISBN 1189:ISBN 979:zino 961:spin 491:wino 487:bino 310:and 173:Spin 153:Mass 2996:MOA 2833:LUX 2573:LSP 1521:Tau 1239:doi 1058:GeV 1054:000 999:mix 544:In 537:or 227:In 3170:: 2838:LZ 2768:D3 1354:37 1352:. 1348:. 1317:. 1307:. 1277:. 1273:. 1259:^ 1245:. 1237:. 1229:. 1217:48 1215:. 1203:^ 1187:. 1166:37 1164:. 1160:. 1113:^ 924:+ 902:+ 893:+ 871:+ 863:→ 837:+ 813:+ 786:→ 760:+ 733:→ 681:+ 655:+ 647:→ 619:+ 541:. 509:. 450:. 289:, 105:, 84:, 63:, 2469:e 2462:t 2455:v 2019:) 2015:( 1732:) 1728:( 1386:e 1379:t 1372:v 1325:. 1321:: 1311:: 1287:. 1253:. 1241:: 1233:: 1223:: 1197:. 1137:. 1131:: 993:( 985:( 977:( 970:2 966:1 930:â„“ 914:â„“ 897:â„“ 883:â„“ 849:W 825:W 805:1 772:W 752:1 723:2 694:â„“ 668:â„“ 631:Z 611:1 592:→ 582:2 470:1 427:i 391:0 386:4 369:, 363:, 358:0 353:1 325:4 304:3 283:2 262:1 211:0 201:0 187:2 184:/ 181:1 167:0 147:4 139:) 120:4 99:3 78:2 57:1 23:.

Index

neutrino
Antiparticle
truly neutral particle
Mass
Electric charge
Spin
Lepton number
Baryon number
R parity
supersymmetry
Minimal Supersymmetric Standard Model
fermions
R-parity
charginos
chargino
bino
wino
gauginos
higgsinos
Majorana fermions
antiparticle
weak vector bosons
hadron colliders
cascade decays
colored
squarks
gluinos
R-parity
Z boson
W boson

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