4,084 research outputs found
Grass and lupin silage in rations for beef steers supplemented with barley or potatoes
No full textTwenty-eight Simmental-cross steers weighing 200 (+/- 20.5) kg were used to evaluate grass and whole plant lupin silages in terms of growth rate, dry matter (DM) intake and carcass characteristics. The chemical composition of the silages was determined and Dacron bag procedures were used to estimate DM and protein degradability. The silages were supplemented with either rolled barley or crushed potato. The lupin silage had a lactic acid fermentation with lower DM, neutral detergent fiber (NDF) and protein nitrogen than the grass silage but higher crude protein. There were no statistically significant differences in gain, carcass weight, dressing percentage or backfat levels between steers fed lupin or grass silage. DM intake of the silages was not significantly different but there was a tendency for lower DM intake of lupin silage when supplemented with potatoes. There was no difference in DM degradability between lupin and grass silages. Lupin nitrogen degraded at a significantly faster rate (24.5% h-1) compared with the grass (10.4% h-1). The effective degradation of nitrogen at a ruminal fractional outflow rate of 0.05 h-1 was 63.8% and 79.1% for grass and lupin silage, respectively. Ensiling whole plant lupin can produce a high quality silage for use in beef rations.PT: J; CR: 1984, NUTRIENT REQUIREMENT 1984, REPORT PROTEIN GROUP 1988, SAS STAT USERS GUIDE 1990, OFFICIAL METHODS ANA BUTTERY PJ, 1977, RECENT ADV ANIMAL NU, P8 CASTLE ME, 1984, GRASS FORAGE SCI, V39, P287 CHOU KC, 1964, J AGR SCI, V62, P15 CONE JW, 1991, J SCI FOOD AGR, V54, P23 DEBOEVER JL, 1983, REV AGR-BRUSSELS, V36, P403 DEBRABANDER DL, 1982, REV AGR-BRUSSELS, V35, P3269 DULPHY JP, 1981, INRA PUBL, P81 GLADSTONES JS, 1970, FIELD CROPS ABSTRACT, V23, P123 GOERING HK, 1970, USDA HDB, V379 HVELPLUND T, 1990, STUDY QUANTITATIVE N, P214 MACLEOD JA, 1987, LUPINS POTENTIAL CRO MAKONI NF, 1991, CAN J ANIM SCI, V71, P245 MCQUEEN RE, 1981, LABORATORY EVALUATIO, P87 MERTENS DR, 1989, 1989 P PAC NW NUTR C, P1 ORSKOV ER, 1969, ANIM PROD, V11, P187 ORSKOV ER, 1979, J AGR SCI, V92, P499 PAINE CA, 1982, OCCASIONAL PUBLICATI, V6, P177 PUTNAM DH, 1991, PRODUCTION FACTORS W, P6 ROSS GJS, 1987, MLP MAXIMUM LIKELIHO SARIC O, 1981, 16 P INT GRASSL C, P204 SHELDRICK RD, 1980, GRASS FORAGE SCI, V35, P323 SPICER LA, 1986, J ANIM SCI, V62, P521 THOMAS C, 1988, BRIT GRASSLANDS SOC, V22, P115 THOMAS PC, 1982, FORAGE PROTEIN CONSE, P121 TISSERAND JL, 1982, 2ND P INT LUP C VANSOEST PJ, 1967, J ASSOC OFF ANA CHEM, V50, P50 WILLIAMS W, 1986, 4TH P INT LUP C GER, P1; NR: 31; TC: 3; J9: ANIM FEED SCI TECH; PG: 11; GA: KP899Source type: Electronic(1
Tritoxa californica Sinclair & Macleod & Wheeler 2021, sp. nov.
No full textTritoxa californica sp. nov. (Figs 6, 14, 15, 24) urn:lsid:zoobank.org:act: 0350D4DB-7407-4C19-941A-31B9951299EB Type material. HOLOTYPE ♂, labelled: “ CALIF: Plumas Co. / Little Long Valley / Creek [39°52′06″N 120°42′08″W], 6000′ 6 mi. E./ Spring Garden/ VIII-4-10-1977 ”; “ Malaise Trap / 8A-6P/ M. Wasbauer / Collector”; “ HOLOTYPE / Tritoxa / californica Sinclair,/ MacLeod & Wheeler” (CSCA). PARATYPES: USA. California: El Dorado Co., Pollack Pines [38°45′41″N 120°35′12″W], 2.ix.1986, Jackson trap, peach, D. Bolster (1♂, CSCA); Nipa Co., Angwin, 38.575°N 122.453°W, 17.ix.2008, McPhail trap, T. Samansky (1♂, 1♀, CSCA); Same data as holotype (1♂, 2♀, CSCA); Santa Cruz Co., Big Basin SP [37°10′21″N 122°13′21″W], 13.ix.1966, E.L. Sleeper (1♂, CAS); Trinity Co. [40.66°N 123.12°W], 13.vi.1934 (1♂, CAS); Tuolumne Co., 2.7 mi E Smoky Jack [37°49′3.72″N 119°42′45.61″W], Summer 1962, Frick trap on Prunus emarginata, D.P. Allen (1♂, CSCA). Possible additional material. USA. California: El Dorado Co., Placerville [38°43′47″N 120°47′55″W], 26.vi.1953, P.H. Arnaud (1♂, USNM) [genitalia lost]; Sagehen Ck Field Stn., 15 km N Truckee, 39°25.89′N 120°14.61′W, 16.viii.1999, J. Savage (1♀, LEM); Nevada Co., Sagehen Ck [39°25′57″N 120°14′13″W], 2.vii.1968, R. W. Pinger (1♀, USNM). Diagnosis. This species has the general appearance of Tritoxa cuneata, but is distinguished by the short, oblique discal hyaline crossband not extending beyond level of crossvein r-m in cell dm, inner surstylus with tight cluster of 4–5 thick prensisetae and phallus is shorter, with two loops. Description. Entirely yellowish brown to brown, abdomen darker brown bands. Head: ocellar triangle dark brown to black, microtrichose; frons yellowish brown to brown; parafrontal silvery microtrichia stripe very narrow, limited to extreme margin of eye, continuous with very narrow microtrichose parafacial; gena slightly darker brown below narrowest part of lower eye margin; postocular microtrichia slightly wider than parafrontal microtrichose stripe in lateral view, extending from base to middle of eye; face concolourous with face laterally, slightly paler medially; supracervical setulae very pale. Antenna with postpedicel greyish brown, yellowish brown on inner and medially surfaces. Proboscis with yellowish brown palpus. Thorax: yellowish brown; scutum mostly thinly microtrichose without pair of vittae; lateral margin of scutum and postpronotal lobe broadly shiny; scutellum concolourous with scutum; mediotergite without distinct stripe; pleura shiny, anepisternum and katepisternum lightly clothed in whitish microtrichia when viewed obliquely; whitish microtrichia above fore coxa; 2 anepisternal setae. Wing (Fig. 6) entirely brown, slightly tapered apically, with 3 hyaline crossbands; some faded or paler regions between bands; costal cell without hyaline band at humeral break, with narrow hyaline band at extreme apex of cell in line with discal hyaline crossband; oblique subbasal hyaline crossband very short, extending to basal fifth of cell dm; discal hyaline crossband short, continuous from R 1, reaching posterior margin of cell dm, not extending beyond level of crossvein r-m in cell dm; subapical hyaline crossband nearly straight, anterior end not extending proximal to crossvein r-m; crossvein dm-m straight to slightly arched; anal lobe developed; calypter with white margin. Abdomen: yellowish brown. Male terminalia (Figs 14, 15): inner surstylus with tight cluster of 4–5 thick prensisetae, inner margin concave; outer surstylus slender, slightly tapered and arched, slightly longer than length of inner surstylus, with narrow apex (Fig. 10); subepandrial sclerite with strong dark setae. Cercus with short setae; apical margin slightly pointed. Phallus short, with 2 loops. Distribution. This species is known exclusively from northern California (Fig. 24). Remarks. See comments under T. cuneata.Published as part of Sinclair, Bradley J., Macleod, Alyssa M. & Wheeler, Terry A., 2021, Revision of the Nearctic genus Tritoxa Loew (Diptera: Ulidiidae), pp. 359-379 in Zootaxa 4920 (3) on pages 361-362, DOI: 10.11646/zootaxa.4920.3.3, http://zenodo.org/record/447808
High protein and low trypsin inhibitor varieties of full-fat soybeans in broiler chicken starter diets
No full textIn a randomized block design nutritional quality of 2 new varieties of full-fat soyabeans (SB) in broiler starter diets was evaluated. Protein sources were raw SB (39% crude protein (CP), 70 Trypsin Inhibitor Units (TIU) per g DM), autoclaved SB, autoclaved high protein (HP) SB, low trypsin inhibitor (LTI) (42 TIU/g DM) and commercially roasted SB. Diets were isonitrogenous and isoenergetic. Supplementing diets with 0.3% DL-methionine was also studied, as the antiproteolytic activity of the TI makes sulphur amino acids less available for growth. Mean body weight gain, feed conversion efficiency, DM and CP digestibilities and total carcass protein and energy content of the chickens fed HP, autoclaved or roasted SB were higher (P http://upei-resolver.asin-risa.ca?sid=SP:CABI&id=pmid:&id=&issn=0008-3984&isbn=&volume=73&issue=2&spage=401&pages=401-409&date=1993&title=Canadian%20Journal%20of%20Animal%20Science&atitle=High%20protein%20and%20low%20trypsin%20inhibitor%20varieties%20of%20full-fat%20soybeans%20in%20broiler%20chicken%20starter%20diets.&aulast=Chohan&pid=%3Cauthor%3EChohan%2c%20A%20K%3bHamilton%2c%20R%20M%20G%3bMcNiven%2c%20M%20A%3bMacLeod%2c%20J%20A%3C%2Fauthor%3E%3CAN%3E19931463725%3C%2FAN%3E%3CDT%3EJournal%20article%3C%2FDT%3
Tritoxa decipiens Sinclair & Macleod & Wheeler 2021, sp. nov.
No full textTritoxa decipiens sp. nov. (Figs 8, 17, 25) urn:lsid:zoobank.org:act: 04FAB0F1-E45D-4D0E-AB68-FCFFC7237E00 Type material. HOLOTYPE ♂, labelled: “BC 30 km E/ Smithers [54°46′N 127°10′W]/ 15.VI.1989 / M.Pollak ”; “ HOLOTYPE / Tritoxa / decipiens Sinclair,/ MacLeod & Wheeler” (CNC). PARATYPES: CANADA. Alberta: Banff [51°10′N 115°34′W], 30.vii.1924, E. Hearle (1♂, 3♀, CNC), same data except, no date, N.B. Sanson (1♂, CNC); same data except, Buffalo Pk, 4500 ft, 2,17.vii., 5.viii.1925, O. Bryant (1♂, 1♀, USNM); Elkwater Park [49°39′39″N 110°16′54″W], 26.vii.1952, L.A. Konotopetz (1♂, CNC); Dunvegan, N shore Peace River, south facing grassy slopes, 12–14.vii.1997, T.A. Wheeler, S. Boucher (9♂, 5♀, LEM); same data except, 55°55.59′N 118°35.74′W, 19.vii.2003, S. Boucher (1♂, LEM); same data except, 55°55′25″N 118°35′40″, 21.vii.2003, V. Dion (1♀, LEM); Lethbridge [49°41′39″N 112°49′58″W], 15.vi.1925, H.L. Seamans (1♂, CNC); Peace River [56°14′02″N 117°17′23″W], 10.vii.1961,A. R. Brooks (1♂, CNC); Waterton Lakes [49°02′N 113°54′W], 19.vi.1923, J. McDunnough (3♂, CNC); same data except, 2.vii.1923 (1♀, DEBU); Waterton, 11.vi.1962, K.C. Herrmann (2♂, 1♀, CNC); same data except, 13.viii.1922, H.E. Gray (1♂, CNC). British Colombia: Adams Lake [51°15′N 119°30′W], 16.vi.1923, W.B. Anderson (1♂, 2♀, CNC); Elko [49°18′N 115°06′W], Chilcotin [51°52′N 123°15′W], 30.vi.1920, E. R. Buckell (1♂, CNC); Elko [49°18′00″N 115°06′42″W], E. Kootenay, 9.vii.1949, H.B. Leech (1♀, CAS); Lac la Hache [51°48′N 121°28′W], 12.vii.1964, L.H. McMullen (1♀, CNC); Pouce Coupe [55°42′N 120°08′W], 1.vii.1927, P.N. Vroom (1♀, CNC); Pavilion Lake [50.86677°N 121.74191°W], 5.vi.1938, G.S. Walley (1♂, 1♀, CNC); Robson [49°20′08″N 117°41′19″W], 30.v.1948, 7.vii.1950, H. R. Foxlee (2♂, 2♀, CNC); Rolla [55°54′N 120°08′W], 21.vii.1927, P.N. Vroom (1♂, CNC); 30 km E Smithers [54°46′N 127°10′W], 15.vi.1989, M. Pollak (11♂, 7♀, CNC); Williams Lake [52°07′N 122°08′W], 11.vii.1938, J.K. Jacob (1♀, CNC). USA. Arizona: Greer [34°00′N 109°27′W], 3.vii.1953, A.&H. Dietrich (1♂, USNM); White River [34°00′N 109°27′W], 21.vi.1957, G. Butler & F. Werner (2♂, USNM); White Mtns [33°54′N 109°33′W], 8.vii.1933, Parker (1♂, 1♀, USNM). Colorado: Boulder [40°00′N 105°16′W], 5500 ft, 16.vi.1961, B.H. Poole (2♂, CNC); same data except, 19.vi.1961, W. R.M. Mason (1♂, CNC); 5 mi S Boulder, 21–17.vi.1961, W. R.M. Mason (1♂, 2♀, CNC); same data except, 4 mi N, 20.vi.1961, C.H. Mann (1♂, CNC); Buckhorn Ck [40.4208169° -105.1752614°], 11.vii.1937, C.L. Johnston (1♂, USNM); 5 mi. W Denver, 17.vi.1965, J. R. Bider (1♂, LEM); Estes Park [40°22′N 105°31′W], 7500 ft, 2–16.viii.1961, B.H. Poole (5♂, 8♀, CNC); same data except, 20.vii.1961, C.H. Mann (1♂, CNC); same data except, J. R. Stainer (1♀, CNC); Florissant [38°56′N 105°17′W], 8200 ft, vi.24.14, Champlain (1♂, USNM); Gilpin Co., Kelly-Dahl [39°55′57″N 105°29′52″W], south of Nederland, 2615 m, 4.viii.1973, P.H. Arnaud (1♂, CAS); Larimer Co., 15 mi. W Livermore [40°47′N 105°13′W], 1500 ft, 3.vii.1982, W.J. Pulawski (1♂, CAS); Manitou [38°51′N 104°54′W], 25.vii.1903, Van Duzee (1♂, CAS); near Meeker [40°2′N 107°54′W], 11.vi.1984, Ponderosa pine/prairie, H. Goulet (18♂, 24♀, CNC); Nederland [39°57′N 105°30′W], Science Lodge, 9000 ft, 29.vii.1961, J. R. Stainer (1♂, 1♀, CNC); same data except, 9500 ft, 29.vi.1961, B.H. Poole (1♀, CNC); same data except, 8200 ft, W. R. M. Mason (1♀, CNC); South Park, nr Jefferson [39°22′N 105°48′W], 21.vi.1961, C.H. Mann (2♂, 2♀, CNC); Westlake [40.788701° -105.568232°], 7.vii.1900, no collector (1♂, USNM). Idaho: Lehmi Co., Lehmi Pass [44°58′27″N 113°26′42″W], 7340–7500 ft, 16.vii.1978, J.F. G. & T. M. Clarke (1♂, USNM). Montana: Lolo [46°45′N 114°5′W], 1.vii.1904, no collector (1♀, USNM); Silver Box Co., 14 mi. S Butte [45°59′N 112°31′W], 23.viii.1973, A.J. & M.E. Gilbert (1♂, CSCA). New Mexico: Cloudcroft [32°57′N 105°44′W], 8.vi.1968, R. Eads (2♂, 1♀, USNM); Lincoln Co., Lincoln NF, 33°23′32.5″N 105°44′01.1″W, 2374 m, 7.vi.2010, T. N. & S.D. Gaimari (3♂, 1♀, CSCA); same data except, White Mtns, Mills Cyn, 33°27′08.2″N 105°44′46.6″W, 1837 m, 14.vi.2007, S.D. Gaimari (1♂, 2♀, CSCA); Raton [36°53′N 104°26′W], 19.vi.1937, E.D. Ball (1♂, 1♀, USNM). Utah: Henry Mtns, Bull Creek Pass [38°05′N 110°48′W], 10200 ft, 18.vii.1968, H.F. Howden (1♂, CNC); Snowville [41°58′N 112°42′W], 2.vii.1950, F.C. Harmston (1♂, USNM). Wyoming: Red Gulch Rd. off Hwy. 14 nr. Shell [44°32′N 107°46′W], pans in barren area nr. cottonwoods, cow dung, 5–19.viii.1990, J.E. Swann (2♂, DEBU). Diagnosis. This species can be recognized by the discal hyaline crossband ending in or very near the posterior corner of cell dm and inner surstylus with 5–8 thick prensisetae. Description. Entirely reddish brown, abdomen darker. Head: ocellar triangle shiny black; frons reddish-brown to brown; silvery parafrontal microtrichose stripe very narrow, continuous with very narrow microtrichose parafacial; gena dark brown below narrowest part of lower eye margin; postocular microtrichia wider than parafrontal microtrichia in lateral view, extending from oral margin to middle of eye; face yellowish-brown to brown; supracervical setulae usually yellow. Antenna with postpedicel greyish brown, yellowish brown on ventral and basal surfaces. Proboscis with palpus concolourous with face. Thorax: reddish-brown to brown; scutum mostly thinly pruinescent with pair of whitish pruinescent vittae; lateral margin of scutum and postpronotal lobe broadly shiny; scutellum concolourous with scutum; mediotergite without distinct stripe; pleura shiny, posterior portion of anepisternum and katepisternum lightly clothed in whitish microtrichia when viewed obliquely; whitish microtrichia above fore coxa; 1 anepisternal seta. Wing (Fig. 8) rounded apically, brown, with some faded regions; costal cell without narrow hyaline band at humeral break, with hyaline band at apical fourth in line with discal hyaline crossband; hyaline area from apical region of Sc to R 1; oblique subbasal hyaline crossband reaching near mid-length of cell dm; discal hyaline crossband oblique, long, extending to or very close to posterior distal corner of cell dm, not displaced at R 4+5; subapical hyaline crossband nearly straight to slightly arched, anterior end not extending proximal to crossvein r-m; crossvein dm-m straight; anal lobe more weakly developed; calypter usually with broad white margin. Abdomen: brown to black tergites and sternites; pleural membrane infuscate. Male terminalia (Fig. 16): inner surstylus with 5–8 thick prensisetae distributed along curved inner margin; outer surstylus slender, longer than inner surstylus, arched mesally with rounded apex; subepandrial sclerite with scattered dark setae. Cercus with long apicolateral setae; apical margin pointed. Phallus long, with some 5 loops. Distribution. Tritoxa decipiens is widespread along the Rocky Mountains and neighbouring ranges and areas from British Columbia and Alberta to New Mexico (Fig. 25). Etymology. The species name is from the Latin decipiens (deceive), referring to the species’ similar appearance to T. cuneata. Remarks. Steyskal had recognized and labelled several unpublished subspecies of T. cuneata from the USNM collection, including some identified here as T. decipiens sp. nov. These species appeared to be based on wing pattern differences, which are not supported on the basis of male terminalia. See the Remarks section under T. cuneata for further comments.Published as part of Sinclair, Bradley J., Macleod, Alyssa M. & Wheeler, Terry A., 2021, Revision of the Nearctic genus Tritoxa Loew (Diptera: Ulidiidae), pp. 359-379 in Zootaxa 4920 (3) on pages 366-367, DOI: 10.11646/zootaxa.4920.3.3, http://zenodo.org/record/447808
What do we really know about cognitive inhibition? Task demands and inhibitory effects across a range of memory and behavioural tasks
No full textThe authors (SN, principal investigator and MDM as co-investigator) received funding from the British Academy for this research (http://www.britac.ac.uk/). The grant number was SG111104.Our study explores inhibitory control across a range of widely recognised memory and behavioural tasks. Eighty-seven never-depressed participants completed a series of tasks designed to measure inhibitory control in memory and behaviour. Specifically, a variant of the selective retrieval-practice and the Think/No-Think tasks were employed as measures of memory inhibition. The Stroop-Colour Naming and the Go/No-Go tasks were used as measures of behavioural inhibition. Participants completed all 4 tasks. Task presentation order was counterbalanced across 3 separate testing sessions for each participant. Standard inhibitory forgetting effects emerged on both memory tasks but the extent of forgetting across these tasks was not correlated. Furthermore, there was no relationship between memory inhibition tasks and either of the main behavioural inhibition measures. At a time when cognitive inhibition continues to gain acceptance as an explanatory mechanism, our study raises fundamental questions about what we actually know about inhibition and how it is affected by the processing demands of particular inhibitory tasks.Peer reviewe
Effects of roasting of lupins (Lupinus albus) and high protein variety of soybeans (AC Proteus) on chemical composition and in situ dry matter and nitrogen disappearance in dairy cows
No full textSweet white lupins (Lupinus albus) and a high protein variety of soyabeans, AC Proteus (HPSB), were roasted in an electric roaster at 300 degrees C for 1, 2, 3 or 4 min. Raw and roasted samples were analysed for total nitrogen, acid detergent insoluble N and protease insoluble N, and available rumen by-pass protein (RBP) was determined. In situ degradability of DM and N was determined using Dacron bags in the rumen of 3 ruminally cannulated dry cows. Soyabean meal was used as a control treatment. Roasting did not affect the total N content of lupins (4.9%) and HPSB (7.3%), but increased linearly (P http://upei-resolver.asin-risa.ca?sid=SP:CABI&id=pmid:&id=&issn=0377-8401&isbn=&volume=51&issue=3%2f4&spage=329&pages=329-335&date=1995&title=Animal%20Feed%20Science%20and%20Technology&atitle=Effects%20of%20roasting%20of%20lupins%20%28Lupinus%20albus%29%20and%20high%20protein%20variety%20of%20soybeans%20%28AC%20Proteus%29%20on%20chemical%20composition%20and%20in%20situ%20dry%20matter%20and%20nitrogen%20disappearance%20in%20dairy%20cows.&aulast=Zaman&pid=%3Cauthor%3EZaman%2c%20M%20S%3bMcNiven%2c%20M%20A%3bGrimmelt%2c%20B%3bMacLeod%2c%20J%20A%3C%2Fauthor%3E%3CAN%3E19951405718%3C%2FAN%3E%3CDT%3EJournal%20article%3C%2FDT%3
Association of baseline hyperglycemia with outcomes of patients with and without diabetes with acute ischemic stroke treated with intravenous thrombolysis: A propensity score-matched analysis from the SITS-ISTR registry
No full textAvailable data from observational studies on the association of admission hyperglycemia (aHG) with outcomes of patients with acute ischemic stroke (AIS) treated with intravenous thrombolysis (IVT) are contradictory, especially when stratified by diabetes mellitus (DM) history. We assessed the association of aHG (≥144 mg/dL) with outcomes stratified by DM history using propensity score-matched (PSM) data from the SITS-ISTR. The primary safety outcome was symptomatic intracranial hemorrhage (SICH); 3-month functional independence (FI) (modified Rankin Scale [mRS] scores 0-2) represented the primary efficacy outcome. Patients with and without aHG did not differ in baseline characteristics both in the non-DM (n = 12,318) and DM (n = 6,572) PSM subgroups. In the non-DM group, patients with aHG had lower 3-month FI rates (53.3% vs. 57.9%, P < 0.001), higher 3-month mortality rates (19.2% vs. 16.0%, P < 0.001), and similar symptomatic intracerebral hemorrhage (SICH) rates (1.7% vs. 1.8%, P = 0.563) compared with patients without aHG. Similarly, in the DM group, patients with aHG had lower rates of 3-month favorable functional outcome (mRS scores 0-1, 34.1% vs. 39.3%, P < 0.001) and FI (48.2% vs. 52.5%, P < 0.001), higher 3-month mortality rates (23.7% vs. 19.9%, P < 0.001), and similar SICH rates (2.2% vs. 2.7%, P = 0.224) compared with patients without aHG. In conclusion, aHG was associated with unfavorable 3-month clinical outcomes in patients with and without DM and AIS treated with IVT
Entanglement and quantity in quantum space - About quantum measurement (II)
No full textAs a continuation and extension of "quantity in phase space" "quantity in quantum space" is introduced. With that, the disappearing of quantum interference discussed in a previous paper [S. Durr, et al., Nature 395 (1998) 33] is explained in the same spirit as our recent papers [Ren De-Ming, Commun. Theor. Phys. (Beijing, China) 41 (2004) 685, 833].Physics, MultidisciplinarySCI(E)中国科学引文数据库(CSCD)1ARTICLE133-364
Sneutrino DM in the NMSSM with inverse seesaw mechanism
No full textIn supersymmetric theories like the Next-to-Minimal Supersymmetric Standard Model (NMSSM), the lightest neutralino with bino or singlino as its dominant component is customarily taken as dark matter (DM) candidate. Since light Higgsinos favored by naturalness can strength the couplings of the DM and thus enhance the DM-nucleon scattering rate, the tension between naturalness and DM direct detection results becomes more and more acute with the improved experimental sensitivity. In this work, we extend the NMSSM by inverse seesaw mechanism to generate neutrino mass, and show that in certain parameter space the lightest sneutrino may act as a viable DM candidate, i.e. it can annihilate by multi-channels to get correct relic density and meanwhile satisfy all experimental constraints. The most striking feature of the extension is that the DM-nucleon scattering rate can be naturally below its current experimental bounds regardless of the higgsino mass, and hence it alleviates the tension between naturalness and DM experiments. Other interesting features include that the Higgs phenomenology becomes much richer than that of the original NMSSM due to the relaxed constraints from DM physics and also due to the presence of extra neutrinos, and that the signatures of sparticles at colliders are quite different from those with neutralino as DM candidate.National Natural Science Foundation of China (NNSFC) [11575053]SCI(E)ARTICLE1
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